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  • Pulse shrinker

    From Cursitor Doom@cd@notformail.com to sci.electronics.design on Wed Oct 1 23:54:10 2025
    From Newsgroup: sci.electronics.design

    Gentlemen,

    I need to shrink the duration of 'on' pulses in a continuous DC pulse
    train. At present, they're 4.5V and 30mS wide and I'd like to shrink
    them down to 3mS and ideally double their amplitude as well. I've had
    some ideas using a couple of FETs and 2 NAND gates, but with the other necessary components it comes out at over a dozen parts. I'm thinking
    their ought to be a more elegant and simpler way of doing this. Any
    ideas? I don't need any kind of schematic, just general ideas.

    CD
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  • From john larkin@jl@glen--canyon.com to sci.electronics.design on Wed Oct 1 16:40:52 2025
    From Newsgroup: sci.electronics.design

    On Wed, 01 Oct 2025 23:54:10 +0100, Cursitor Doom <cd@notformail.com>
    wrote:

    Gentlemen,

    I need to shrink the duration of 'on' pulses in a continuous DC pulse
    train. At present, they're 4.5V and 30mS wide and I'd like to shrink
    them down to 3mS and ideally double their amplitude as well. I've had
    some ideas using a couple of FETs and 2 NAND gates, but with the other >necessary components it comes out at over a dozen parts. I'm thinking
    their ought to be a more elegant and simpler way of doing this. Any
    ideas? I don't need any kind of schematic, just general ideas.

    CD

    Just fire a 3 ms one-shot? Or an RC differentiator.

    Double with a fast opamp, or a mosfet gate driver chip, one of the
    IXDN series maybe.

    So maybe one RC and an IXDN602. Needs a 10 volt power supply.

    John Larkin
    Highland Tech Glen Canyon Design Center
    Lunatic Fringe Electronics
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  • From DJ Delorie@dj@delorie.com to sci.electronics.design on Wed Oct 1 23:44:12 2025
    From Newsgroup: sci.electronics.design


    Series capacitor with diode to ground, and you've got part of a classic
    voltage doubler.
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  • From Cursitor Doom@cd@notformail.com to sci.electronics.design on Thu Oct 2 12:42:36 2025
    From Newsgroup: sci.electronics.design

    On Wed, 01 Oct 2025 23:54:10 +0100, Cursitor Doom <cd@notformail.com>
    wrote:

    Gentlemen,

    I need to shrink the duration of 'on' pulses in a continuous DC pulse
    train. At present, they're 4.5V and 30mS wide and I'd like to shrink
    them down to 3mS and ideally double their amplitude as well. I've had
    some ideas using a couple of FETs and 2 NAND gates, but with the other >necessary components it comes out at over a dozen parts. I'm thinking
    their ought to be a more elegant and simpler way of doing this. Any
    ideas? I don't need any kind of schematic, just general ideas.

    CD

    Guys, please ignore this question. I've no idea how it got re-posted,
    but it pre-dates the death of Jim Thompson (who kindly came up with a
    circuit to solve the problem). Apologies for any confusion.
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