I've been playing with the circuit, and have got rid of one op amp,
which made the simulation run much faster, but didn't help the
distortion performance.

Swapping the LT1115 for the LME49710 speeded up the simulation a bit
more, but didn't make any difference to the distortion either. A few of
the ferrite beads have gone too.

Version 4
SHEET 1 3608 920
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SYMATTR SpiceLine Ipk=3 Rser=0.0122 Rpar=870 Cpar=1000f mfg="Würth
Elektronik" pn="7427503 WE-UKW 40060"
SYMBOL FerriteBead -1520 -976 R0
SYMATTR InstName L14
SYMATTR Value 14µ
SYMATTR SpiceLine Ipk=3 Rser=0.0122 Rpar=870 Cpar=1000f
SYMBOL res -2000 -1840 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R24
SYMATTR Value 20k
SYMATTR SpiceLine tol=0.1
SYMBOL res -2000 -960 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R25
SYMATTR Value 10k
SYMATTR SpiceLine tol=0.1
SYMBOL pnp -1840 -1472 M180
SYMATTR InstName Q3
SYMBOL cap -1840 -1376 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C25
SYMATTR Value 100n
SYMBOL res -1792 -1840 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R27
SYMATTR Value 6.65k
SYMATTR SpiceLine tol=0.1
SYMBOL res 2384 -1792 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R9
SYMATTR Value 17k
SYMBOL res 2416 -1728 R0
SYMATTR InstName R28
SYMATTR Value 68k
SYMBOL res -1408 -1776 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R7
SYMATTR Value 187
SYMATTR SpiceLine tol=1
SYMBOL res -1456 -1712 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R29
SYMATTR Value 220
SYMATTR SpiceLine tol=0.1
SYMBOL res -1536 -1968 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R30
SYMATTR Value 13.3k
SYMATTR SpiceLine tol=0.1
SYMBOL Opamps\\LT1115 -656 -1504 R0
SYMATTR InstName U3
SYMBOL Opamps\\LT1115 -176 -1584 R0
SYMATTR InstName U8
TEXT -1424 -776 Left 2 !.MODEL BAS70L D \n+ IS = 3.22E-9 \n+ N = 1.018
\n+ BV = 77 \n+ IBV = 1.67E-7 \n+ RS = 20.89 \n+ CJO = 1.608E-12 \n+ VJ
= 0.3891 \n+ M = 0.3683 \n+ FC = 0.5 \n+ EG = 0.69 \n+ XTI = 2 \n.ENDS
TEXT -336 -528 Left 2 ;R2 a,b,c, Vishay Beschlag ACAS06S0830372P1AT
precision 10k resistor array \n R1a, R1b Maxim MAX5492LB10000+T 10K
resistive divider in a SOT-23-5 package
TEXT -720 -464 Left 2 !.MODEL MMBF4391 NJF VTO=-4.6 BETA=0.02779
LAMBDA=0.00595 RD=1 RS=1 IS=1e-14 CGD=14p CGS=10.5p PB=1 B=1 KF=1e-18
AF=1 FC=0.5 mfg=Motorola
TEXT -1112 -464 Left 2 !.tran 0 10s 0s startup

--
Bill Sloman, Sydney

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 12/17/2024 10:49 PM, Bill Sloman wrote:

I've been playing with the circuit, and have got rid of one op amp,
which made the simulation run much faster, but didn't help the
distortion performance.

Swapping the LT1115 for the LME49710 speeded up the simulation a bit
more, but didn't make any difference to the distortion either. A few of
the ferrite beads have gone too.

It seems to like to squeg for me (LTSpice 17.0.37)

<https://imgur.com/a/6uqsw1H>

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 18/12/2024 5:16 pm, bitrex wrote:

On 12/17/2024 10:49 PM, Bill Sloman wrote:

I've been playing with the circuit, and have got rid of one op amp,
which made the simulation run much faster, but didn't help the
distortion performance.

Swapping the LT1115 for the LME49710 speeded up the simulation a bit
more, but didn't make any difference to the distortion either. A few
of the ferrite beads have gone too.

It seems to like to squeg for me (LTSpice 17.0.37)

<https://imgur.com/a/6uqsw1H>

I've seen that happen, but only when the one of the connections has come unstuck. The route through WordPad to here and on to your own .asc file
can screw up the schematic.


The amplitude control feedback loop - through the four-pole maximally
flat low pass filter around U6 and U7 through the integrator around U5
does include the 68k resistor at R10 to provide enough phase lead to
keep it stable.

I plot V(out) and the control voltage V(fet-gate), and V(fet-gate)
starts off at 0V and drops below -3.862V within 5msec after which V(out)
starts building up. The amplitude control system system kicks in at
20msec and by 41msec has got V(fet-gate) back to -3.862V where V(out)
starts to fall back, and eventually undershoots, but the ringing is
damped, and the system is stable after about 0.5 sec.

Post the .asc file you ran.

--
Bill Sloman, Sydney

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 18/12/2024 10:44 pm, Bill Sloman wrote:

On 18/12/2024 5:16 pm, bitrex wrote:

On 12/17/2024 10:49 PM, Bill Sloman wrote:

I've been playing with the circuit, and have got rid of one op amp,
which made the simulation run much faster, but didn't help the
distortion performance.

Swapping the LT1115 for the LME49710 speeded up the simulation a bit
more, but didn't make any difference to the distortion either. A few
of the ferrite beads have gone too.

It seems to like to squeg for me (LTSpice 17.0.37)

<https://imgur.com/a/6uqsw1H>

I've seen that happen, but only when the one of the connections has come unstuck. The route through WordPad to here and on to your own .asc file
can screw up the schematic.

When I was looking at the circuit I realised that I'd left out R31, and
got R7 slightly wrong at the FET gate. It doesn't make an obvious
difference, but here's the corrected .asc file.

Version 4
SHEET 1 3608 920
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WIRE -1104 -2176 -1616 -2176
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FLAG 464 -1152 0
FLAG -48 -1024 0
FLAG -1264 -992 0
FLAG 336 -2176 Vcc
FLAG 416 -624 Vee
FLAG -560 -1152 0
FLAG 16 -1520 Vout
FLAG 2576 -960 0
FLAG -1536 -1520 Fet-gate
FLAG 2432 -1456 Vcc
FLAG -1040 -832 Vee
FLAG -288 -1456 0
FLAG 336 -1888 0
FLAG 1376 -1904 filt1
FLAG 1648 -1648 Vcc
FLAG 1632 -1456 Vee
FLAG 1520 -1152 0
FLAG 1952 -1920 filter2
FLAG -1616 -1312 0
FLAG 2432 -1584 0
SYMBOL Opamps\\LT1360 208 -1248 R0
SYMATTR InstName U1
SYMBOL res 48 -1344 R0
WINDOW 0 41 37 Left 2
WINDOW 3 36 71 Left 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMATTR SpiceLine tol=0.1
SYMBOL res -64 -1152 R0
WINDOW 3 41 74 Left 2
WINDOW 0 43 31 Left 2
SYMATTR Value 4k02
SYMATTR InstName R2
SYMATTR SpiceLine tol=1
SYMBOL cap -160 -1136 R0
SYMATTR InstName C1
SYMATTR Value 3.3n
SYMBOL schottky 352 -1344 R0
WINDOW 3 -89 62 Left 2
WINDOW 0 -92 37 Left 2
SYMATTR Value BAS70L
SYMATTR InstName D1
SYMBOL schottky 352 -944 R0
WINDOW 3 -78 61 Left 2
WINDOW 0 -81 40 Left 2
SYMATTR Value BAS70L
SYMATTR InstName D2
SYMBOL res 352 -1472 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1a
SYMATTR Value 10k
SYMATTR SpiceLine tol=0.1
SYMBOL res 208 -1536 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 20k
SYMATTR SpiceLine tol=1
SYMBOL res 480 -1408 R0
WINDOW 0 41 41 Left 2
WINDOW 3 34 79 Left 2
SYMATTR InstName R2a
SYMATTR Value 10k
SYMATTR SpiceLine tol=0.1
SYMBOL res 560 -928 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2b
SYMATTR Value 10k
SYMATTR SpiceLine tol=0.1
SYMBOL res 720 -928 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2c
SYMATTR Value 10k
SYMATTR SpiceLine tol=0.1
SYMBOL cap 704 -832 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 4.7n
SYMATTR SpiceLine Rser=10 Lser=6n
SYMBOL cap 192 -1056 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C4
SYMATTR Value 3.3p
SYMBOL res 48 -896 R0
WINDOW 0 39 33 Left 2
WINDOW 3 40 74 Left 2
SYMATTR InstName R1b
SYMATTR Value 10k
SYMATTR SpiceLine tol=0.1
SYMBOL voltage -1104 -1120 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL voltage -1104 -976 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL cap -480 -1552 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C5
SYMATTR Value 15n
SYMATTR SpiceLine V=63 Rser=4 Lser=12n
SYMBOL res -448 -1520 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 10.7k
SYMATTR SpiceLine tol=1
SYMBOL cap -64 -1728 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C6
SYMATTR Value 15n
SYMATTR SpiceLine V=63 Rser=4 Lser=12n
SYMBOL cap 3104 -1664 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C8
SYMATTR Value 100n
SYMBOL res 2848 -1760 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R10
SYMATTR Value 68k
SYMBOL Opamps\\LT1056A 2992 -1456 R0
SYMATTR InstName U5
SYMBOL cap 2784 -1120 R0
SYMATTR InstName C10
SYMATTR Value 3.3µ
SYMBOL cap 2912 -1552 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C11
SYMATTR Value 3.3p
SYMBOL res -1600 -1360 R180
WINDOW 0 31 76 Left 2
WINDOW 3 31 40 Left 2
SYMATTR InstName R11
SYMATTR Value 10k
SYMATTR SpiceLine tol=0.1
SYMBOL Opamps\\OP27 576 -1264 R0
SYMATTR InstName U2
SYMBOL FerriteBead 576 -672 R0
SYMATTR InstName L2
SYMATTR Value 1000n
SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth
Elektronik" pn="782422601 WE-CBA 0402"
SYMBOL cap 752 -1408 R0
SYMATTR InstName C15
SYMATTR Value 100n
SYMBOL cap 752 -800 R0
SYMATTR InstName C16
SYMATTR Value 100n
SYMBOL FerriteBead -176 -928 R0
SYMATTR InstName L4
SYMATTR Value 1000n
SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth
Elektronik" pn="782422601 WE-CBA 0402"
SYMBOL cap -336 -2000 R0
WINDOW 0 -60 15 Left 2
WINDOW 3 -62 54 Left 2
SYMATTR InstName C17
SYMATTR Value 100n
SYMBOL cap -336 -1168 R0
WINDOW 0 -60 15 Left 2
WINDOW 3 -62 54 Left 2
SYMATTR InstName C18
SYMATTR Value 100n
SYMBOL res -1632 -1664 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R21
SYMATTR Value 10k
SYMATTR SpiceLine tol=0.1
SYMBOL cap 2272 -1184 R0
SYMATTR InstName C21
SYMATTR Value 100n
SYMBOL FerriteBead 2288 -1408 R0
SYMATTR InstName L7
SYMATTR Value 1000n
SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth
Elektronik" pn="782422601 WE-CBA 0402"
SYMBOL res -512 -1888 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R22
SYMATTR Value 2.49k
SYMATTR SpiceLine tol=1
SYMBOL FerriteBead -320 -2112 R0
SYMATTR InstName L8
SYMATTR Value 1000n
SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth
Elektronik" pn="782422601 WE-CBA 0402"
SYMBOL cap -752 -1984 R0
WINDOW 0 -60 15 Left 2
WINDOW 3 -62 54 Left 2
SYMATTR InstName C7
SYMATTR Value 100n
SYMBOL FerriteBead -736 -2128 R0
SYMATTR InstName L3
SYMATTR Value 1000n
SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth
Elektronik" pn="782422601 WE-CBA 0402"
SYMBOL FerriteBead -656 -896 R0
SYMATTR InstName L9
SYMATTR Value 1000n
SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth
Elektronik" pn="782422601 WE-CBA 0402"
SYMBOL cap -864 -1152 R0
WINDOW 0 -60 15 Left 2
WINDOW 3 -62 54 Left 2
SYMATTR InstName C23
SYMATTR Value 100n
SYMBOL res -160 -1600 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R26
SYMATTR Value 10.7k
SYMATTR SpiceLine tol=1
SYMBOL res -768 -1808 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 4.87k
SYMATTR SpiceLine tol=1
SYMBOL cap -784 -1584 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C19
SYMATTR Value 10p
SYMBOL FerriteBead 208 -672 R0
SYMATTR InstName L5
SYMATTR Value 1000n
SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth
Elektronik" pn="782422601 WE-CBA 0402"
SYMBOL FerriteBead 208 -2128 R0
SYMATTR InstName L6
SYMATTR Value 1000n
SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth
Elektronik" pn="782422601 WE-CBA 0402"
SYMBOL cap 320 -1968 R0
WINDOW 0 -60 15 Left 2
WINDOW 3 -62 54 Left 2
SYMATTR InstName C20
SYMATTR Value 100n
SYMBOL cap -96 -816 R0
WINDOW 0 -60 15 Left 2
WINDOW 3 -62 54 Left 2
SYMATTR InstName C22
SYMATTR Value 100n
SYMBOL njf -1312 -1584 R0
SYMATTR InstName J1
SYMATTR Value MMBF4391
SYMBOL References\\LTC6655-1.25 2560 -1120 R0
SYMATTR InstName U4
SYMBOL cap -64 -1824 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C9
SYMATTR Value 10p
SYMBOL FerriteBead 576 -1936 R0
SYMATTR InstName L13
SYMATTR Value 1000n
SYMATTR SpiceLine Ipk=0.2 Rser=0.562 Rpar=750 Cpar=350f mfg="Würth
Elektronik" pn="782422601 WE-CBA 0402"
SYMBOL res -944 -1808 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 82
SYMATTR SpiceLine tol=1
SYMBOL cap 704 -1088 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C13
SYMATTR Value 10p
SYMBOL res 2592 -1792 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R12
SYMATTR Value 137k
SYMBOL res 1376 -1776 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 14k
SYMBOL res 1216 -1456 R0
SYMATTR InstName R13
SYMATTR Value 56k
SYMBOL cap 1312 -1392 R0
SYMATTR InstName C3
SYMATTR Value 18n
SYMBOL cap 1056 -1856 R0
SYMATTR InstName C12
SYMATTR Value 18n
SYMBOL res 1216 -1568 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R14
SYMATTR Value 14k
SYMBOL Opamps\\LT1013 1392 -1632 R0
SYMATTR InstName U6
SYMBOL res 896 -1536 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R15
SYMATTR Value 18.7k
SYMBOL res 2048 -1840 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R16
SYMATTR Value 14k
SYMBOL cap 1728 -1872 R0
SYMATTR InstName C14
SYMATTR Value 18n
SYMBOL res 1888 -1584 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R17
SYMATTR Value 14k
SYMBOL Opamps\\LT1013 2064 -1648 R0
SYMATTR InstName U7
SYMBOL res 1568 -1552 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R18
SYMATTR Value 18.7k
SYMBOL res 1888 -1408 R0
SYMATTR InstName R19
SYMATTR Value 56k
SYMBOL cap 1984 -1344 R0
SYMATTR InstName C24
SYMATTR Value 18n
SYMBOL npn -1584 -1120 R0
SYMATTR InstName Q1
SYMATTR Value BC847A
SYMBOL npn -1712 -1120 M0
SYMATTR InstName Q2
SYMATTR Value BC847A
SYMBOL res -1536 -960 R0
WINDOW 0 41 37 Left 2
WINDOW 3 36 71 Left 2
SYMATTR InstName R20
SYMATTR Value 1.2k
SYMATTR SpiceLine tol=0.1
SYMBOL res -1792 -960 R0
WINDOW 0 41 37 Left 2
WINDOW 3 36 71 Left 2
SYMATTR InstName R23
SYMATTR Value 1.2k
SYMATTR SpiceLine tol=0.1
SYMBOL FerriteBead -1776 -976 R0
SYMATTR InstName L12
SYMATTR Value 14µ
SYMATTR SpiceLine Ipk=3 Rser=0.0122 Rpar=870 Cpar=1000f mfg="Würth
Elektronik" pn="7427503 WE-UKW 40060"
SYMBOL FerriteBead -1520 -976 R0
SYMATTR InstName L14
SYMATTR Value 14µ
SYMATTR SpiceLine Ipk=3 Rser=0.0122 Rpar=870 Cpar=1000f
SYMBOL res -2000 -1840 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R24
SYMATTR Value 20k
SYMATTR SpiceLine tol=0.1
SYMBOL res -2000 -960 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R25
SYMATTR Value 10k
SYMATTR SpiceLine tol=0.1
SYMBOL pnp -1840 -1472 M180
SYMATTR InstName Q3
SYMBOL cap -1840 -1376 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C25
SYMATTR Value 100n
SYMBOL res -1792 -1840 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R27
SYMATTR Value 6.65k
SYMATTR SpiceLine tol=0.1
SYMBOL res 2384 -1792 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R9
SYMATTR Value 17k
SYMBOL res 2416 -1728 R0
SYMATTR InstName R28
SYMATTR Value 68k
SYMBOL res -1408 -1776 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R7
SYMATTR Value 215
SYMATTR SpiceLine tol=1
SYMBOL res -1456 -1712 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R29
SYMATTR Value 220
SYMATTR SpiceLine tol=0.1
SYMBOL res -1504 -1968 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R30
SYMATTR Value 13.3k
SYMATTR SpiceLine tol=0.1
SYMBOL Opamps\\LT1115 -656 -1504 R0
SYMATTR InstName U3
SYMBOL Opamps\\LT1115 -176 -1584 R0
SYMATTR InstName U8
SYMBOL res -1632 -1968 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R31
SYMATTR Value 47k
SYMATTR SpiceLine tol=0.1
TEXT -1424 -776 Left 2 !.MODEL BAS70L D \n+ IS = 3.22E-9 \n+ N = 1.018
\n+ BV = 77 \n+ IBV = 1.67E-7 \n+ RS = 20.89 \n+ CJO = 1.608E-12 \n+ VJ
= 0.3891 \n+ M = 0.3683 \n+ FC = 0.5 \n+ EG = 0.69 \n+ XTI = 2 \n.ENDS
TEXT -336 -528 Left 2 ;R2 a,b,c, Vishay Beschlag ACAS06S0830372P1AT
precision 10k resistor array \n R1a, R1b Maxim MAX5492LB10000+T 10K
resistive divider in a SOT-23-5 package
TEXT -720 -464 Left 2 !.MODEL MMBF4391 NJF VTO=-4.6 BETA=0.02779
LAMBDA=0.00595 RD=1 RS=1 IS=1e-14 CGD=14p CGS=10.5p PB=1 B=1 KF=1e-18
AF=1 FC=0.5 mfg=Motorola
TEXT -1112 -464 Left 2 !.tran 0 10s 0s startup

--
Bill Sloman, Sydney

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vjtgnp$24ubg$1@dont-email.me...

I've been playing with the circuit, and have got rid of one op amp, which made the simulation run much faster, but didn't help the
distortion performance.

Swapping the LT1115 for the LME49710 speeded up the simulation a bit more, but didn't make any difference to the distortion
either. A few of the ferrite beads have gone too.

I got a simulation speed of about 30us/s so I didn't wait the nearly 4 days it would take to complete.
I did an FFT on the first few cycles and it does look 100dB down up to 1.5MHz.

But what's the point when the circuit below is comfortably 120dB down in simulation using less than half the number of components?

It requires only a single rail and if 60dB will meet your needs then a single 9V battery is fine.

All the components are doing what I want them to do and I know what they all do.

To attempt do any better in simulation I'd replace D1 with a precision rectifier at 0 and 180 degrees and maybe 90 and 270 too.

If building this for real then ten turn trimmers would be used for:
R14 2.2k
R3 68 ohm
R16 100k
And I'd also want R19 or part of it variable.

I wish LTSpice had a "Do you want to fix apparent line wraps Y/N". That shouldn't be hard.

Also is there any way in LTSpice to find a component?
What I mean is let's say you have a schematic like Bill's schematic and you know that R17 is there somewhere but you don't know
where.

Version 4
SHEET 1 2196 932
WIRE 864 -784 704 -784
WIRE 944 -784 944 -816
WIRE 768 -720 768 -736
WIRE 864 -704 864 -784
WIRE 864 -704 800 -704
WIRE 704 -688 704 -784
WIRE 704 -688 592 -688
WIRE 736 -688 704 -688
WIRE 944 -672 944 -704
WIRE 944 -672 800 -672
WIRE 336 -640 256 -640
WIRE 480 -640 400 -640
WIRE 768 -640 768 -656
WIRE 944 -640 944 -672
WIRE 1056 -640 944 -640
WIRE 944 -624 944 -640
WIRE 1056 -608 1056 -640
WIRE 592 -576 592 -688
WIRE 256 -544 256 -640
WIRE 336 -544 256 -544
WIRE 480 -544 480 -640
WIRE 480 -544 416 -544
WIRE 944 -512 944 -544
WIRE 1056 -512 1056 -544
WIRE -192 -480 -192 -512
WIRE 384 -432 384 -448
WIRE 480 -416 480 -544
WIRE 480 -416 416 -416
WIRE 592 -416 592 -496
WIRE 592 -416 480 -416
WIRE 848 -416 592 -416
WIRE 992 -416 928 -416
WIRE 1136 -416 1056 -416
WIRE 256 -400 256 -544
WIRE 352 -400 256 -400
WIRE 448 -384 416 -384
WIRE 464 -384 448 -384
WIRE 16 -352 -144 -352
WIRE 384 -352 384 -368
WIRE 256 -336 256 -400
WIRE 944 -288 848 -288
WIRE 1136 -288 1136 -416
WIRE 1136 -288 1008 -288
WIRE -80 -272 -80 -304
WIRE -144 -256 -144 -352
WIRE -112 -256 -144 -256
WIRE 16 -240 16 -352
WIRE 16 -240 -48 -240
WIRE 64 -240 16 -240
WIRE 96 -240 64 -240
WIRE -192 -224 -192 -400
WIRE -112 -224 -192 -224
WIRE -416 -208 -416 -304
WIRE 480 -192 416 -192
WIRE 608 -192 544 -192
WIRE 848 -192 848 -288
WIRE 944 -192 848 -192
WIRE 1136 -192 1136 -288
WIRE 1136 -192 1024 -192
WIRE -192 -176 -192 -224
WIRE -192 -176 -256 -176
WIRE -80 -176 -80 -208
WIRE 208 -176 160 -176
WIRE 256 -176 256 -256
WIRE 256 -176 208 -176
WIRE -192 -144 -192 -176
WIRE -256 -128 -256 -176
WIRE 160 -128 160 -176
WIRE 416 -96 416 -192
WIRE 480 -96 416 -96
WIRE 608 -96 608 -192
WIRE 608 -96 560 -96
WIRE 848 -96 848 -192
WIRE 896 -96 848 -96
WIRE 1008 -96 976 -96
WIRE 1136 -96 1136 -192
WIRE 1136 -96 1088 -96
WIRE -416 -32 -416 -128
WIRE -256 -32 -256 -64
WIRE -192 -32 -192 -64
WIRE 256 -32 256 -176
WIRE 496 0 496 -16
WIRE 128 16 112 16
WIRE 160 16 160 -48
WIRE 160 16 128 16
WIRE 192 16 160 16
WIRE 304 16 288 16
WIRE 336 16 304 16
WIRE 416 16 416 -96
WIRE 416 16 336 16
WIRE 464 16 416 16
WIRE 928 16 928 0
WIRE 1136 16 1136 -96
WIRE 1168 16 1136 16
WIRE 1296 16 1248 16
WIRE 1456 16 1360 16
WIRE 1520 16 1456 16
WIRE 608 32 608 -96
WIRE 608 32 528 32
WIRE 640 32 608 32
WIRE 720 32 704 32
WIRE 848 32 848 -96
WIRE 848 32 800 32
WIRE 896 32 848 32
WIRE 432 48 416 48
WIRE 464 48 432 48
WIRE 1136 48 1136 16
WIRE 1136 48 960 48
WIRE 864 64 848 64
WIRE 896 64 864 64
WIRE 496 80 496 64
WIRE 1520 80 1520 16
WIRE 112 96 112 16
WIRE 192 96 112 96
WIRE 336 96 336 16
WIRE 336 96 272 96
WIRE 928 96 928 80
WIRE 1520 176 1520 160
WIRE 112 224 112 96
WIRE 480 224 112 224
WIRE 640 224 560 224
WIRE 1136 224 1136 48
WIRE 1136 224 720 224
FLAG 384 -448 V+
FLAG 496 -16 V+
FLAG 928 0 V+
FLAG 208 -176 gate
FLAG 128 16 drn
FLAG 1520 176 0
FLAG 1456 16 output
FLAG -416 -32 0
FLAG 384 -352 0
FLAG 496 80 0
FLAG 928 96 0
FLAG -416 -304 V+
FLAG 448 -384 half
FLAG 432 48 half
FLAG 864 64 half
FLAG -80 -176 0
FLAG -80 -304 V+
FLAG 64 -240 half
FLAG -192 -32 0
FLAG -192 -512 V+
FLAG -256 -32 0
FLAG 304 16 src
FLAG 768 -736 V+
FLAG 768 -640 0
FLAG 944 -512 0
FLAG 944 -816 V+
FLAG 1056 -512 0
SYMBOL njf 192 -32 M90
WINDOW 0 -37 23 VRight 2
WINDOW 3 -9 -3 VRight 2
SYMATTR InstName J1
SYMATTR Value J113
SYMBOL voltage -416 -224 R0
WINDOW 123 0 0 Left 0
WINDOW 39 10 135 Left 2
WINDOW 0 10 0 Left 2
WINDOW 3 15 104 Left 2
SYMATTR InstName V2
SYMATTR Value 32
SYMBOL schottky 1056 -432 R90
WINDOW 3 32 32 VTop 2
WINDOW 0 0 32 VBottom 2
SYMATTR Value BAS40HY
SYMATTR InstName D1
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 176 80 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 47
SYMBOL res 176 -144 M0
WINDOW 0 38 42 Left 2
WINDOW 3 36 66 Left 2
SYMATTR InstName R2
SYMATTR Value 100k
SYMBOL res 272 -240 R180
WINDOW 0 40 70 Left 2
WINDOW 3 45 42 Left 2
SYMATTR InstName R1
SYMATTR Value 100k
SYMBOL res 320 -528 R270
WINDOW 0 33 55 VTop 2
WINDOW 3 -3 55 VBottom 2
SYMATTR InstName R4
SYMATTR Value 100k
SYMBOL res 944 -432 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 100k
SYMBOL cap 400 -656 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 10000n
SYMATTR SpiceLine V=6.3 Irms=0 Rser=0 Lser=0 mfg="Murata" pn="GRM185R60J106ME15" type="X5R"
SYMBOL res 1040 -208 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R9
SYMATTR Value 15k
SYMBOL res 816 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R12
SYMATTR Value 8.2K
SYMBOL cap 1008 -304 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 10n
SYMATTR SpiceLine V=16 Irms=647m Rser=0.0322889 Lser=0 mfg="KEMET" pn="C0201C103K4PAC" type="X5R"
SYMBOL cap 704 16 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C4
SYMATTR Value 22n
SYMATTR SpiceLine V=4 Irms=356m Rser=0.150334 Lser=0 mfg="KEMET" pn="C0402C223K7PAC" type="X5R"
SYMBOL res 576 -112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R13
SYMATTR Value 10k
SYMBOL cap 544 -208 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C5
SYMATTR Value 22p
SYMATTR SpiceLine V=16 Irms=0 Rser=0.3482 Lser=551p mfg="Wⁿrth Elektronik" pn="885012006019 WCAP-CSGP 0603" type="NP0"
SYMBOL res 736 208 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R14
SYMATTR Value 1345
SYMBOL res 576 -592 R0
SYMATTR InstName R17
SYMATTR Value 100k
SYMBOL res 1264 0 R90
WINDOW 0 -4 57 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 600
SYMBOL res 1536 176 R180
WINDOW 0 47 75 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R8
SYMATTR Value 600
SYMBOL res -208 -384 M180
WINDOW 0 40 70 Left 2
WINDOW 3 37 41 Left 2
SYMATTR InstName R5
SYMATTR Value 100k
SYMBOL res -208 -48 M180
WINDOW 0 40 70 Left 2
WINDOW 3 38 43 Left 2
SYMATTR InstName R10
SYMATTR Value 100k
SYMBOL cap -240 -64 R180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C1
SYMATTR Value 10n
SYMATTR SpiceLine V=50 Irms=291m Rser=0.34258 Lser=0 mfg="KEMET" pn="C0805F103K5RAC" type="X7R"
SYMBOL cap 1360 0 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C6
SYMATTR Value 10000n
SYMATTR SpiceLine V=25 Irms=0 Rser=0 Lser=0 mfg="Murata" pn="GRM188R61E106MA73" type="X5R"
SYMBOL res 992 -112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R11
SYMATTR Value 150k
SYMBOL res 576 208 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R15
SYMATTR Value 8.2k
SYMBOL res 1104 -112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R16
SYMATTR Value 47k
SYMBOL OpAmps\\LT1058 -80 -304 R0
SYMATTR InstName U5
SYMBOL OpAmps\\LT1058 384 -464 M0
SYMATTR InstName U6
SYMBOL OpAmps\\LT1678 928 48 R0
SYMATTR InstName U3
SYMBOL OpAmps\\LT1678 496 32 R0
SYMATTR InstName U4
SYMBOL OpAmps\\LT1058 768 -752 M0
WINDOW 0 -79 26 Left 2
WINDOW 3 -120 114 Left 2
SYMATTR InstName U1
SYMBOL res 928 -800 R0
SYMATTR InstName R19
SYMATTR Value 100k
SYMBOL res 928 -640 R0
SYMATTR InstName R20
SYMATTR Value 120k
SYMBOL cap 1040 -544 M180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C7
SYMATTR Value 10n
SYMATTR SpiceLine V=50 Irms=291m Rser=0.34258 Lser=0 mfg="KEMET" pn="C0805F103K5RAC" type="X7R"
TEXT -496 136 Left 2 !.tran 0 30 0 1u uic
TEXT -496 88 Left 2 !.options plotwinsize=0 numdgt=7 method=trap
TEXT -296 -648 Left 2 ;1kHz low distortion sinewave oscillator.
TEXT -296 -616 Left 2 ;18 Dec 2024.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 19/12/2024 6:00 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vjtgnp$24ubg$1@dont-email.me...

I've been playing with the circuit, and have got rid of one op amp, which made the simulation run much faster, but didn't help the
distortion performance.

Swapping the LT1115 for the LME49710 speeded up the simulation a bit more, but didn't make any difference to the distortion
either. A few of the ferrite beads have gone too.

I got a simulation speed of about 30us/s so I didn't wait the nearly 4 days it would take to complete.
I did an FFT on the first few cycles and it does look 100dB down up to 1.5MHz.

It rans at 68msec/sec for me and takes a couple of minutes to run the
full ten seconds.

But what's the point when the circuit below is comfortably 120dB down in simulation using less than half the number of components?

It requires only a single rail and if 60dB will meet your needs then a single 9V battery is fine.

All the components are doing what I want them to do and I know what they all do.

Or think you do. You explanations haven't been all that clear.

To attempt do any better in simulation I'd replace D1 with a precision rectifier at 0 and 180 degrees and maybe 90 and 270 too.

If building this for real then ten turn trimmers would be used for:
R14 2.2k
R3 68 ohm
R16 100k
And I'd also want R19 or part of it variable.

Why a ten turn trimmer?

Beckman ten-turn precision potentionmeters were designed to be used with turns-counting dials. 19mm trimmers ran around twenty turns, but weren't
all that precisely settable.

I wish LTSpice had a "Do you want to fix apparent line wraps Y/N". That shouldn't be hard.

First define a line wrap in terms that you can program. It's a carriage
return and a line feed, but so is a real new line.

Also is there any way in LTSpice to find a component?

Inspection works fine for me. Professional circuit diagrams tend to get re-numbered before they are released to production so the numbers run
from left to right across the sheet in bands, then from top to bottom as
you moved down from the top band to the bottom band.

What I mean is let's say you have a schematic like Bill's schematic and you know that R17 is there somewhere but you don't know
where.

It's on the non-inverting input of U7.

--
Bill Sloman, Sydney

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk00um$2i900$1@dont-email.me...

On 19/12/2024 6:00 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vjtgnp$24ubg$1@dont-email.me...

I've been playing with the circuit, and have got rid of one op amp, which made the simulation run much faster, but didn't help
the
distortion performance.

Swapping the LT1115 for the LME49710 speeded up the simulation a bit more, but didn't make any difference to the distortion
either. A few of the ferrite beads have gone too.

I got a simulation speed of about 30us/s so I didn't wait the nearly 4 days it would take to complete.
I did an FFT on the first few cycles and it does look 100dB down up to 1.5MHz.

It rans at 68msec/sec for me and takes a couple of minutes to run the full ten seconds.

I used the circuit from your third post. One op amp had to be moved down a bit into position and then I hit simulate.
To be sure we're talking about the same circuit I've reposted it below.
I'm using LTSpice 24.0.12 with no new model updates available as of this post.

But what's the point when the circuit below is comfortably 120dB down in simulation using less than half the number of
components?

It requires only a single rail and if 60dB will meet your needs then a single 9V battery is fine.

All the components are doing what I want them to do and I know what they all do.

Or think you do. You explanations haven't been all that clear.

Well it's true that most, perhaps all, of the designs I've ever done used components I didn't design myself. Even discrete circuits.
So I have to rely on either what the data sheet says or what tests with a real circuit say.
In this case I don't have a real circuit so I have to rely on LTSpice.

To attempt do any better in simulation I'd replace D1 with a precision rectifier at 0 and 180 degrees and maybe 90 and 270 too.

If building this for real then ten turn trimmers would be used for:
R14 2.2k
R3 68 ohm
R16 100k
And I'd also want R19 or part of it variable.

Why a ten turn trimmer?

Can be 100 turn if you want. The point is only that fine adjustment would be a good idea.

Beckman ten-turn precision potentionmeters were designed to be used with turns-counting dials. 19mm trimmers ran around twenty
turns, but weren't all that precisely settable.

I wish LTSpice had a "Do you want to fix apparent line wraps Y/N". That shouldn't be hard.

First define a line wrap in terms that you can program. It's a carriage return and a line feed, but so is a real new line.

There are reasons why Notepad++ has an EOL conversion option Bill but never mind.

Also is there any way in LTSpice to find a component?

Inspection works fine for me. Professional circuit diagrams tend to get re-numbered before they are released to production so the
numbers run from left to right across the sheet in bands, then from top to bottom as you moved down from the top band to the
bottom band.

What would you do when a change is required which requires an additional component such as an additional resistor or capacitor?

What I mean is let's say you have a schematic like Bill's schematic and you know that R17 is there somewhere but you don't know
where.

It's on the non-inverting input of U7.

And it was just an example.

--
Bill Sloman, Sydney

Repost of simulated circuit:

Version 4
SHEET 1 3608 920
WIRE -1616 -2176 -1984 -2176
WIRE -1104 -2176 -1616 -2176
WIRE -736 -2176 -1104 -2176
WIRE -320 -2176 -736 -2176
WIRE 208 -2176 -320 -2176
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FLAG -48 -1024 0
FLAG -1264 -992 0
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FLAG -560 -1152 0
FLAG 16 -1520 Vout
FLAG 2576 -960 0
FLAG -1536 -1520 Fet-gate
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FLAG -288 -1456 0
FLAG 336 -1888 0
FLAG 1376 -1904 filt1
FLAG 1648 -1648 Vcc
FLAG 1632 -1456 Vee
FLAG 1520 -1152 0
FLAG 1952 -1920 filter2
FLAG -1616 -1312 0
FLAG 2432 -1584 0
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WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
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SYMBOL voltage -1104 -976 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
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SYMBOL cap -480 -1552 R90
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WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R18
SYMATTR Value 18.7k
SYMBOL res 1888 -1408 R0
SYMATTR InstName R19
SYMATTR Value 56k
SYMBOL cap 1984 -1344 R0
SYMATTR InstName C24
SYMATTR Value 18n
SYMBOL npn -1584 -1120 R0
SYMATTR InstName Q1
SYMATTR Value BC847A
SYMBOL npn -1712 -1120 M0
SYMATTR InstName Q2
SYMATTR Value BC847A
SYMBOL res -1536 -960 R0
WINDOW 0 41 37 Left 2
WINDOW 3 36 71 Left 2
SYMATTR InstName R20
SYMATTR Value 1.2k
SYMATTR SpiceLine tol=0.1
SYMBOL res -1792 -960 R0
WINDOW 0 41 37 Left 2
WINDOW 3 36 71 Left 2
SYMATTR InstName R23
SYMATTR Value 1.2k
SYMATTR SpiceLine tol=0.1
SYMBOL FerriteBead -1776 -976 R0
SYMATTR InstName L12
SYMATTR Value 14╡
SYMATTR SpiceLine Ipk=3 Rser=0.0122 Rpar=870 Cpar=1000f mfg="Wⁿrth Elektronik" pn="7427503 WE-UKW 40060"
SYMBOL FerriteBead -1520 -976 R0
SYMATTR InstName L14
SYMATTR Value 14╡
SYMATTR SpiceLine Ipk=3 Rser=0.0122 Rpar=870 Cpar=1000f
SYMBOL res -2000 -1840 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R24
SYMATTR Value 20k
SYMATTR SpiceLine tol=0.1
SYMBOL res -2000 -960 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R25
SYMATTR Value 10k
SYMATTR SpiceLine tol=0.1
SYMBOL pnp -1840 -1472 M180
SYMATTR InstName Q3
SYMBOL cap -1840 -1376 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C25
SYMATTR Value 100n
SYMBOL res -1792 -1840 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R27
SYMATTR Value 6.65k
SYMATTR SpiceLine tol=0.1
SYMBOL res 2384 -1792 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R9
SYMATTR Value 17k
SYMBOL res 2416 -1728 R0
SYMATTR InstName R28
SYMATTR Value 68k
SYMBOL res -1408 -1776 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R7
SYMATTR Value 215
SYMATTR SpiceLine tol=1
SYMBOL res -1456 -1712 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R29
SYMATTR Value 220
SYMATTR SpiceLine tol=0.1
SYMBOL res -1504 -1968 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R30
SYMATTR Value 13.3k
SYMATTR SpiceLine tol=0.1
SYMBOL Opamps\\LT1115 -656 -1504 R0
SYMATTR InstName U3
SYMBOL Opamps\\LT1115 -176 -1584 R0
SYMATTR InstName U8
SYMBOL res -1632 -1968 R0
WINDOW 0 43 37 Left 2
WINDOW 3 47 73 Left 2
SYMATTR InstName R31
SYMATTR Value 47k
SYMATTR SpiceLine tol=0.1
TEXT -1424 -776 Left 2 !.MODEL BAS70L D \n+ IS = 3.22E-9 \n+ N = 1.018 \n+ BV = 77 \n+ IBV = 1.67E-7 \n+ RS = 20.89 \n+ CJO =
1.608E-12 \n+ VJ = 0.3891 \n+ M = 0.3683 \n+ FC = 0.5 \n+ EG = 0.69 \n+ XTI = 2 \n.ENDS
TEXT -336 -528 Left 2 ;R2 a,b,c, Vishay Beschlag ACAS06S0830372P1AT precision 10k resistor array \n R1a, R1b Maxim
MAX5492LB10000+T 10K resistive divider in a SOT-23-5 package
TEXT -720 -464 Left 2 !.MODEL MMBF4391 NJF VTO=-4.6 BETA=0.02779 LAMBDA=0.00595 RD=1 RS=1 IS=1e-14 CGD=14p CGS=10.5p PB=1 B=1
KF=1e-18 AF=1 FC=0.5 mfg=Motorola
TEXT -1112 -464 Left 2 !.tran 0 10s 0s startup

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 19/12/2024 2:10 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk00um$2i900$1@dont-email.me...

On 19/12/2024 6:00 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vjtgnp$24ubg$1@dont-email.me...

I've been playing with the circuit, and have got rid of one op amp, which made the simulation run much faster, but didn't help
the
distortion performance.

Swapping the LT1115 for the LME49710 speeded up the simulation a bit more, but didn't make any difference to the distortion
either. A few of the ferrite beads have gone too.

I got a simulation speed of about 30us/s so I didn't wait the nearly 4 days it would take to complete.
I did an FFT on the first few cycles and it does look 100dB down up to 1.5MHz.

It rans at 68msec/sec for me and takes a couple of minutes to run the full ten seconds.

I used the circuit from your third post. One op amp had to be moved down a bit into position and then I hit simulate.
To be sure we're talking about the same circuit I've reposted it below.
I'm using LTSpice 24.0.12 with no new model updates available as of this post.

And I'm using LTSpice XVII(x64)(17.0.37.0) up-dated recently.

I finally got your version to work. As you say, U1 had to be moved into
place, but I also had to change C10 on the output of U4. I'd specified
the capacitance as 3.3u. but the "u" symbol had vanished. When I
specified the capacitance as 3300n everything worked fine.

If building this for real then ten turn trimmers would be used for:
R14 2.2k
R3 68 ohm
R16 100k
And I'd also want R19 or part of it variable.

Why a ten turn trimmer?

Can be 100 turn if you want. The point is only that fine adjustment would be a good idea.

Lots of turns don't always equate to fine setability. The screw will try
to move the brush along the resistive element, but the brush tends to
move in fits and starts. I once specified a rather expensive Vishay
trimmer which had a split brush that moved more smoothly, and we knocked
about twenty minutes off the setting up time for a rather cranky circuit
which more than paid for the extra cost of the fancy Vishay trimmer,

Beckman ten-turn precision potentionmeters were designed to be used with turns-counting dials. 19mm trimmers ran around twenty
turns, but weren't all that precisely settable.

I wish LTSpice had a "Do you want to fix apparent line wraps Y/N". That shouldn't be hard.

First define a line wrap in terms that you can program. It's a carriage return and a line feed, but so is a real new line.

There are reasons why Notepad++ has an EOL conversion option Bill but never mind.

Word salad. Of course there are reasons, but you'd indicate what they
are if you were trying to be helpful. LTspice does seem to have a
limited numbers of words that can be put at the start of a line, and it
baulks if it finds anything else at the start of a new line. If it
treated that condition as indicative of a line wrap and deleted the
preceding new line character we might get somewhere but the fact that it doesn't suggests that the situation might be more complicated than that.

Also is there any way in LTSpice to find a component?

Inspection works fine for me. Professional circuit diagrams tend to get re-numbered before they are released to production so the
numbers run from left to right across the sheet in bands, then from top to bottom as you moved down from the top band to the
bottom band.

What would you do when a change is required which requires an additional component such as an additional resistor or capacitor?

I wasn't responsible for keeping production drawings up to date, and the
people who were had a bunch of conflicting priorities to reconcile.

The service engineer who travelled internationally to keep the machines
working were forceful personalities who needed the schematics to be
rapidly intelligible. I got told off by them from time to time, and got congratulated once or twice.

What I mean is let's say you have a schematic like Bill's schematic and you know that R17 is there somewhere but you don't know
where.

It's on the non-inverting input of U7.

And it was just an example.

Of your capacity to make an unhelpful meal of a minor problem.

--
Bill Sloman, Sydney

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk0ehh$2o9dc$1@dont-email.me...

On 19/12/2024 2:10 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk00um$2i900$1@dont-email.me...

On 19/12/2024 6:00 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vjtgnp$24ubg$1@dont-email.me...

I've been playing with the circuit, and have got rid of one op amp, which made the simulation run much faster, but didn't help
the
distortion performance.

Swapping the LT1115 for the LME49710 speeded up the simulation a bit more, but didn't make any difference to the distortion
either. A few of the ferrite beads have gone too.

I got a simulation speed of about 30us/s so I didn't wait the nearly 4 days it would take to complete.
I did an FFT on the first few cycles and it does look 100dB down up to 1.5MHz.

It rans at 68msec/sec for me and takes a couple of minutes to run the full ten seconds.

I used the circuit from your third post. One op amp had to be moved down a bit into position and then I hit simulate.
To be sure we're talking about the same circuit I've reposted it below.
I'm using LTSpice 24.0.12 with no new model updates available as of this post.

And I'm using LTSpice XVII(x64)(17.0.37.0) up-dated recently.

I finally got your version to work. As you say, U1 had to be moved into place, but I also had to change C10 on the output of U4.
I'd specified the capacitance as 3.3u. but the "u" symbol had vanished. When I specified the capacitance as 3300n everything
worked fine.

C10 is definitely 3.3u here. I tried changing it to 3300n but still less than 30us/s when I start the simulation.

If building this for real then ten turn trimmers would be used for:
R14 2.2k
R3 68 ohm
R16 100k
And I'd also want R19 or part of it variable.

Why a ten turn trimmer?

Can be 100 turn if you want. The point is only that fine adjustment would be a good idea.

Lots of turns don't always equate to fine setability.

Yes I agree. You might easily have the kinds of problems which were solved with anti backlash couplings in the days of drive cords
and tuning capacitors.

The screw will try to move the brush along the resistive element, but the brush tends to move in fits and starts. I once specified
a rather expensive Vishay trimmer which had a split brush that moved more smoothly, and we knocked about twenty minutes off the
setting up time for a rather cranky circuit which more than paid for the extra cost of the fancy Vishay trimmer,

Beckman ten-turn precision potentionmeters were designed to be used with turns-counting dials. 19mm trimmers ran around twenty
turns, but weren't all that precisely settable.

I wish LTSpice had a "Do you want to fix apparent line wraps Y/N". That shouldn't be hard.

First define a line wrap in terms that you can program. It's a carriage return and a line feed, but so is a real new line.

There are reasons why Notepad++ has an EOL conversion option Bill but never mind.

Word salad. Of course there are reasons, but you'd indicate what they are if you were trying to be helpful. LTspice does seem to
have a limited numbers of words that can be put at the start of a line, and it baulks if it finds anything else at the start of a
new line.

Exactly. So it shouldn't be hard to have an option (Do you want to treat lines beginning with unknown as wrapped lines Y/N) when it
opens a schematic.
Line wraps may be CR LF but they can also be only CR or only LF which is why I frequently use the EOL conversion in Notepad++ when
moving files between Linux and Windows.

If it treated that condition as indicative of a line wrap and deleted the preceding new line character we might get somewhere but
the fact that it doesn't suggests that the situation might be more complicated than that.

Also is there any way in LTSpice to find a component?

Inspection works fine for me. Professional circuit diagrams tend to get re-numbered before they are released to production so
the
numbers run from left to right across the sheet in bands, then from top to bottom as you moved down from the top band to the
bottom band.

What would you do when a change is required which requires an additional component such as an additional resistor or capacitor?

I wasn't responsible for keeping production drawings up to date, and the people who were had a bunch of conflicting priorities to
reconcile.

Ok that's one way to avoid the question.

The service engineer who travelled internationally to keep the machines working were forceful personalities who needed the
schematics to be rapidly intelligible. I got told off by them from time to time, and got congratulated once or twice.

What I mean is let's say you have a schematic like Bill's schematic and you know that R17 is there somewhere but you don't know
where.

It's on the non-inverting input of U7.

And it was just an example.

Of your capacity to make an unhelpful meal of a minor problem.

LOL

--
Bill Sloman, Sydney

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Thu, 19 Dec 2024 09:53:03 -0500, "Edward Rawde"
<invalid@invalid.invalid> wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk0ehh$2o9dc$1@dont-email.me...

On 19/12/2024 2:10 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk00um$2i900$1@dont-email.me...

On 19/12/2024 6:00 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vjtgnp$24ubg$1@dont-email.me...

I've been playing with the circuit, and have got rid of one op amp, which made the simulation run much faster, but didn't help
the
distortion performance.

Swapping the LT1115 for the LME49710 speeded up the simulation a bit more, but didn't make any difference to the distortion
either. A few of the ferrite beads have gone too.

I got a simulation speed of about 30us/s so I didn't wait the nearly 4 days it would take to complete.
I did an FFT on the first few cycles and it does look 100dB down up to 1.5MHz.

It rans at 68msec/sec for me and takes a couple of minutes to run the full ten seconds.

I used the circuit from your third post. One op amp had to be moved down a bit into position and then I hit simulate.
To be sure we're talking about the same circuit I've reposted it below.
I'm using LTSpice 24.0.12 with no new model updates available as of this post.

And I'm using LTSpice XVII(x64)(17.0.37.0) up-dated recently.

I finally got your version to work. As you say, U1 had to be moved into place, but I also had to change C10 on the output of U4.
I'd specified the capacitance as 3.3u. but the "u" symbol had vanished. When I specified the capacitance as 3300n everything
worked fine.

C10 is definitely 3.3u here. I tried changing it to 3300n but still less than 30us/s when I start the simulation.

If building this for real then ten turn trimmers would be used for:
R14 2.2k
R3 68 ohm
R16 100k
And I'd also want R19 or part of it variable.

Why a ten turn trimmer?

Can be 100 turn if you want. The point is only that fine adjustment would be a good idea.

Lots of turns don't always equate to fine setability.

Yes I agree. You might easily have the kinds of problems which were solved with anti backlash couplings in the days of drive cords
and tuning capacitors.

The long multi-turn trimpots are hard to adjust and expensive, and are
no better than single-turns for settability.

Single-turns have much lower HF parasitics too.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

"john larkin" <JL@gct.com> wrote in message news:uoj8mj9t5vc84kl4mdr01n3spqtnra2u6v@4ax.com...

On Thu, 19 Dec 2024 09:53:03 -0500, "Edward Rawde"
<invalid@invalid.invalid> wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk0ehh$2o9dc$1@dont-email.me...

On 19/12/2024 2:10 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk00um$2i900$1@dont-email.me...

On 19/12/2024 6:00 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vjtgnp$24ubg$1@dont-email.me...

I've been playing with the circuit, and have got rid of one op amp, which made the simulation run much faster, but didn't
help
the
distortion performance.

Swapping the LT1115 for the LME49710 speeded up the simulation a bit more, but didn't make any difference to the distortion
either. A few of the ferrite beads have gone too.

I got a simulation speed of about 30us/s so I didn't wait the nearly 4 days it would take to complete.
I did an FFT on the first few cycles and it does look 100dB down up to 1.5MHz.

It rans at 68msec/sec for me and takes a couple of minutes to run the full ten seconds.

I used the circuit from your third post. One op amp had to be moved down a bit into position and then I hit simulate.
To be sure we're talking about the same circuit I've reposted it below. >>>> I'm using LTSpice 24.0.12 with no new model updates available as of this post.

And I'm using LTSpice XVII(x64)(17.0.37.0) up-dated recently.

I finally got your version to work. As you say, U1 had to be moved into place, but I also had to change C10 on the output of U4.
I'd specified the capacitance as 3.3u. but the "u" symbol had vanished. When I specified the capacitance as 3300n everything
worked fine.

C10 is definitely 3.3u here. I tried changing it to 3300n but still less than 30us/s when I start the simulation.

If building this for real then ten turn trimmers would be used for: >>>>>> R14 2.2k
R3 68 ohm
R16 100k
And I'd also want R19 or part of it variable.

Why a ten turn trimmer?

Can be 100 turn if you want. The point is only that fine adjustment would be a good idea.

Lots of turns don't always equate to fine setability.

Yes I agree. You might easily have the kinds of problems which were solved with anti backlash couplings in the days of drive cords
and tuning capacitors.

The long multi-turn trimpots are hard to adjust and expensive, and are
no better than single-turns for settability.

Yes particularly if the resistive element is the same length, it may as well be single-turn.
Single-turn also has the advantage that you can see where it's set before you adjust it.
Multi-turn is usually enclosed so hard to know where it's set before adjustment.

https://www.google.com/search?&q=multi+turn+trimpots&udm=2

So I'd probably go for good quality open single-turn if I ever build the 120dB circuit.

Single-turns have much lower HF parasitics too.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Thu, 19 Dec 2024 12:22:51 -0500, "Edward Rawde"
<invalid@invalid.invalid> wrote:

"john larkin" <JL@gct.com> wrote in message news:uoj8mj9t5vc84kl4mdr01n3spqtnra2u6v@4ax.com...

On Thu, 19 Dec 2024 09:53:03 -0500, "Edward Rawde"
<invalid@invalid.invalid> wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk0ehh$2o9dc$1@dont-email.me...

On 19/12/2024 2:10 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk00um$2i900$1@dont-email.me...

On 19/12/2024 6:00 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vjtgnp$24ubg$1@dont-email.me...

I've been playing with the circuit, and have got rid of one op amp, which made the simulation run much faster, but didn't
help
the
distortion performance.

Swapping the LT1115 for the LME49710 speeded up the simulation a bit more, but didn't make any difference to the distortion
either. A few of the ferrite beads have gone too.

I got a simulation speed of about 30us/s so I didn't wait the nearly 4 days it would take to complete.
I did an FFT on the first few cycles and it does look 100dB down up to 1.5MHz.

It rans at 68msec/sec for me and takes a couple of minutes to run the full ten seconds.

I used the circuit from your third post. One op amp had to be moved down a bit into position and then I hit simulate.
To be sure we're talking about the same circuit I've reposted it below. >>>>> I'm using LTSpice 24.0.12 with no new model updates available as of this post.

And I'm using LTSpice XVII(x64)(17.0.37.0) up-dated recently.

I finally got your version to work. As you say, U1 had to be moved into place, but I also had to change C10 on the output of U4.
I'd specified the capacitance as 3.3u. but the "u" symbol had vanished. When I specified the capacitance as 3300n everything
worked fine.

C10 is definitely 3.3u here. I tried changing it to 3300n but still less than 30us/s when I start the simulation.

If building this for real then ten turn trimmers would be used for: >>>>>>> R14 2.2k
R3 68 ohm
R16 100k
And I'd also want R19 or part of it variable.

Why a ten turn trimmer?

Can be 100 turn if you want. The point is only that fine adjustment would be a good idea.

Lots of turns don't always equate to fine setability.

Yes I agree. You might easily have the kinds of problems which were solved with anti backlash couplings in the days of drive cords
and tuning capacitors.

The long multi-turn trimpots are hard to adjust and expensive, and are
no better than single-turns for settability.

Yes particularly if the resistive element is the same length, it may as well be single-turn.
Single-turn also has the advantage that you can see where it's set before you adjust it.
Multi-turn is usually enclosed so hard to know where it's set before adjustment.

https://www.google.com/search?&q=multi+turn+trimpots&udm=2

So I'd probably go for good quality open single-turn if I ever build the 120dB circuit.

Single-turns have much lower HF parasitics too.

The rectangular multi-turn trimpots have a lot of backlash. A good
single is actually more settable. A heap faster too.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 20/12/2024 1:53 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk0ehh$2o9dc$1@dont-email.me...

On 19/12/2024 2:10 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk00um$2i900$1@dont-email.me...

On 19/12/2024 6:00 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vjtgnp$24ubg$1@dont-email.me...

I've been playing with the circuit, and have got rid of one op amp, which made the simulation run much faster, but didn't help
the
distortion performance.

Swapping the LT1115 for the LME49710 speeded up the simulation a bit more, but didn't make any difference to the distortion
either. A few of the ferrite beads have gone too.

I got a simulation speed of about 30us/s so I didn't wait the nearly 4 days it would take to complete.
I did an FFT on the first few cycles and it does look 100dB down up to 1.5MHz.

It ran at 68msec/sec for me and takes a couple of minutes to run the full ten seconds.

I used the circuit from your third post. One op amp had to be moved down a bit into position and then I hit simulate.
To be sure we're talking about the same circuit I've reposted it below.
I'm using LTSpice 24.0.12 with no new model updates available as of this post.

And I'm using LTSpice XVII(x64)(17.0.37.0) up-dated recently.

I finally got your version to work. As you say, U1 had to be moved into place, but I also had to change C10 on the output of U4.
I'd specified the capacitance as 3.3u. but the "u" symbol had vanished. When I specified the capacitance as 3300n everything
worked fine.

C10 is definitely 3.3u here. I tried changing it to 3300n but still less than 30us/s when I start the simulation.

We do seem to be using different versions of LTSpice. There are subtle
ways the simulation can get screwed up and slowed down. John May
emphasised that using trapezoidal integration rather the modified
trapezoidal or Gear made a positive difference when you were worried
about distortion.

<snip>

Also is there any way in LTSpice to find a component?

Inspection works fine for me. Professional circuit diagrams tend to get re-numbered before they are released to production so
the numbers run from left to right across the sheet in bands, then from top to bottom as you moved down from the top band to the
bottom band.

What would you do when a change is required which requires an additional component such as an additional resistor or capacitor?

I wasn't responsible for keeping production drawings up to date, and the people who were had a bunch of conflicting priorities to
reconcile.

Ok - that's one way to avoid the question.

I know what I'd do, but I don't have background information to give a particularly useful response. Everybody has their own opinions on what
circuit diagrams ought to look like, and companies need to get their
circuit diagrams into a form where the engineers and various sorts of technicians can read them easily, but there's a lot of variation between companies, and I know that US companies made different choices from the
UK and Dutch companies that I worked for.
--
Bill Sloman, Sydney

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 20/12/2024 3:55 am, john larkin wrote:

On Thu, 19 Dec 2024 09:53:03 -0500, "Edward Rawde"
<invalid@invalid.invalid> wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk0ehh$2o9dc$1@dont-email.me...

On 19/12/2024 2:10 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk00um$2i900$1@dont-email.me...

On 19/12/2024 6:00 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vjtgnp$24ubg$1@dont-email.me...

I've been playing with the circuit, and have got rid of one op amp, which made the simulation run much faster, but didn't help
the
distortion performance.

Swapping the LT1115 for the LME49710 speeded up the simulation a bit more, but didn't make any difference to the distortion
either. A few of the ferrite beads have gone too.

I got a simulation speed of about 30us/s so I didn't wait the nearly 4 days it would take to complete.
I did an FFT on the first few cycles and it does look 100dB down up to 1.5MHz.

It rans at 68msec/sec for me and takes a couple of minutes to run the full ten seconds.

I used the circuit from your third post. One op amp had to be moved down a bit into position and then I hit simulate.
To be sure we're talking about the same circuit I've reposted it below. >>>> I'm using LTSpice 24.0.12 with no new model updates available as of this post.

And I'm using LTSpice XVII(x64)(17.0.37.0) up-dated recently.

I finally got your version to work. As you say, U1 had to be moved into place, but I also had to change C10 on the output of U4.
I'd specified the capacitance as 3.3u. but the "u" symbol had vanished. When I specified the capacitance as 3300n everything
worked fine.

C10 is definitely 3.3u here. I tried changing it to 3300n but still less than 30us/s when I start the simulation.

If building this for real then ten turn trimmers would be used for: >>>>>> R14 2.2k
R3 68 ohm
R16 100k
And I'd also want R19 or part of it variable.

Why a ten turn trimmer?

Can be 100 turn if you want. The point is only that fine adjustment would be a good idea.

Lots of turns don't always equate to fine setability.

Yes I agree. You might easily have the kinds of problems which were solved with anti backlash couplings in the days of drive cords
and tuning capacitors.

The long multi-turn trimpots are hard to adjust and expensive, and are
no better than single-turns for settability.

Some of them are quite lot better.

Single-turns have much lower HF parasitics too.

Sometimes true, and sometimes relevant.

--
Bill Sloman, Sydney

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 20/12/2024 4:22 am, Edward Rawde wrote:

"john larkin" <JL@gct.com> wrote in message news:uoj8mj9t5vc84kl4mdr01n3spqtnra2u6v@4ax.com...

On Thu, 19 Dec 2024 09:53:03 -0500, "Edward Rawde"
<invalid@invalid.invalid> wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk0ehh$2o9dc$1@dont-email.me...

On 19/12/2024 2:10 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk00um$2i900$1@dont-email.me...

On 19/12/2024 6:00 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vjtgnp$24ubg$1@dont-email.me...

I've been playing with the circuit, and have got rid of one op amp, which made the simulation run much faster, but didn't
help
the
distortion performance.

Swapping the LT1115 for the LME49710 speeded up the simulation a bit more, but didn't make any difference to the distortion
either. A few of the ferrite beads have gone too.

I got a simulation speed of about 30us/s so I didn't wait the nearly 4 days it would take to complete.
I did an FFT on the first few cycles and it does look 100dB down up to 1.5MHz.

It rans at 68msec/sec for me and takes a couple of minutes to run the full ten seconds.

I used the circuit from your third post. One op amp had to be moved down a bit into position and then I hit simulate.
To be sure we're talking about the same circuit I've reposted it below. >>>>> I'm using LTSpice 24.0.12 with no new model updates available as of this post.

And I'm using LTSpice XVII(x64)(17.0.37.0) up-dated recently.

I finally got your version to work. As you say, U1 had to be moved into place, but I also had to change C10 on the output of U4.
I'd specified the capacitance as 3.3u. but the "u" symbol had vanished. When I specified the capacitance as 3300n everything
worked fine.

C10 is definitely 3.3u here. I tried changing it to 3300n but still less than 30us/s when I start the simulation.

If building this for real then ten turn trimmers would be used for: >>>>>>> R14 2.2k
R3 68 ohm
R16 100k
And I'd also want R19 or part of it variable.

Why a ten turn trimmer?

Can be 100 turn if you want. The point is only that fine adjustment would be a good idea.

Lots of turns don't always equate to fine setability.

Yes I agree. You might easily have the kinds of problems which were solved with anti backlash couplings in the days of drive cords
and tuning capacitors.

The long multi-turn trimpots are hard to adjust and expensive, and are
no better than single-turns for settability.

Yes particularly if the resistive element is the same length, it may as well be single-turn.

Not always true.

Single-turn also has the advantage that you can see where it's set before you adjust it.

Multi-turn is usually enclosed so hard to know where it's set before adjustment.

There was a line of multi-turn trimming potentiometers with a clear
plastic top cover which did let you see where the brush was. Cambridge Instruments bought quite a lot of them. If you thought about what you
were doing it wasn't all that much of an advantage.

https://www.google.com/search?&q=multi+turn+trimpots&udm=2

DSMCZ seems to be an example of a multi-turn trimmer with a translucent
case.

So I'd probably go for good quality open single-turn if I ever build the 120dB circuit.

Bad choice.

Single-turns have much lower HF parasitics too.

The resistive element in a modern multi-turn trimmer is just a long
thin film resistor on an alumina substrate - there's not a lot of RF
parastic stray capacitance and inductance in that.

Wound element potentiometers were a lot worse.

--
Bill Sloman, Sydney

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 20/12/2024 9:34 am, john larkin wrote:

On Thu, 19 Dec 2024 12:22:51 -0500, "Edward Rawde"
<invalid@invalid.invalid> wrote:

"john larkin" <JL@gct.com> wrote in message news:uoj8mj9t5vc84kl4mdr01n3spqtnra2u6v@4ax.com...

On Thu, 19 Dec 2024 09:53:03 -0500, "Edward Rawde"
<invalid@invalid.invalid> wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk0ehh$2o9dc$1@dont-email.me...

On 19/12/2024 2:10 pm, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vk00um$2i900$1@dont-email.me...

On 19/12/2024 6:00 am, Edward Rawde wrote:

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vjtgnp$24ubg$1@dont-email.me...

I've been playing with the circuit, and have got rid of one op amp, which made the simulation run much faster, but didn't
help
the
distortion performance.

Swapping the LT1115 for the LME49710 speeded up the simulation a bit more, but didn't make any difference to the distortion
either. A few of the ferrite beads have gone too.

I got a simulation speed of about 30us/s so I didn't wait the nearly 4 days it would take to complete.
I did an FFT on the first few cycles and it does look 100dB down up to 1.5MHz.

It rans at 68msec/sec for me and takes a couple of minutes to run the full ten seconds.

I used the circuit from your third post. One op amp had to be moved down a bit into position and then I hit simulate.
To be sure we're talking about the same circuit I've reposted it below. >>>>>> I'm using LTSpice 24.0.12 with no new model updates available as of this post.

And I'm using LTSpice XVII(x64)(17.0.37.0) up-dated recently.

I finally got your version to work. As you say, U1 had to be moved into place, but I also had to change C10 on the output of U4.
I'd specified the capacitance as 3.3u. but the "u" symbol had vanished. When I specified the capacitance as 3300n everything
worked fine.

C10 is definitely 3.3u here. I tried changing it to 3300n but still less than 30us/s when I start the simulation.

If building this for real then ten turn trimmers would be used for: >>>>>>>> R14 2.2k
R3 68 ohm
R16 100k
And I'd also want R19 or part of it variable.

Why a ten turn trimmer?

Can be 100 turn if you want. The point is only that fine adjustment would be a good idea.

Lots of turns don't always equate to fine setability.

Yes I agree. You might easily have the kinds of problems which were solved with anti backlash couplings in the days of drive cords
and tuning capacitors.

The long multi-turn trimpots are hard to adjust and expensive, and are
no better than single-turns for settability.

Yes particularly if the resistive element is the same length, it may as well be single-turn.
Single-turn also has the advantage that you can see where it's set before you adjust it.
Multi-turn is usually enclosed so hard to know where it's set before adjustment.

https://www.google.com/search?&q=multi+turn+trimpots&udm=2

So I'd probably go for good quality open single-turn if I ever build the 120dB circuit.

Not a wise choice.

Single-turns have much lower HF parasitics too.

Sometimes.

The rectangular multi-turn trimpots have a lot of backlash. A good
single is actually more settable. A heap faster too.

You should be able cope with the backlash. A good multi-turn
pontentiometer can be set a lot more precisely than any single turn
part, but you have to know what you are buying to get good parts.

--
Bill Sloman, Sydney

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)