From Newsgroup: sci.electronics.design



https://www.dropbox.com/scl/fi/gyn41v2ncb4wcqmise50d/X128_A4.jpg?rlkey=o3lurjhi0srwa7axsbzijjv4l&raw=1

This is just a test board. mostly to help FPGA development and then
later for production test. It's a mezzanine, a baby board, that goes
into the real product.

It's fun to lay out a small board now and then.


John Larkin
Highland Tech Glen Canyon Design Center
Lunatic Fringe Electronics
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From Newsgroup: sci.electronics.design

On Sat, 28 Feb 2026 15:07:55 -0800, john larkin <jl@glen--canyon.com>
wrote:

https://www.dropbox.com/scl/fi/gyn41v2ncb4wcqmise50d/X128_A4.jpg?rlkey=o3lurjhi0srwa7axsbzijjv4l&raw=1

This is just a test board. mostly to help FPGA development and then
later for production test. It's a mezzanine, a baby board, that goes
into the real product.

It's fun to lay out a small board now and then.

John Larkin
Highland Tech Glen Canyon Design Center
Lunatic Fringe Electronics

I remember when people were compulsive about running horizontal or
vertical traces on specific layers. That made sense when every
thru-hole pin was a via.

My SMT boards seem to be totally haywire... do anything that works.
What surprises me is that it *does* usually work. There's usually a
way to route things. There must be some theory there, topology or
something, but I don't know what it is.

Coding an autorouter must be interesting. But so far they don't seem
to be very good.


John Larkin
Highland Tech Glen Canyon Design Center
Lunatic Fringe Electronics
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From Newsgroup: sci.electronics.design

On Mon, 02 Mar 2026 14:34:41 -0800, john larkin <jl@glen--canyon.com>
wrote:

On Sat, 28 Feb 2026 15:07:55 -0800, john larkin <jl@glen--canyon.com>
wrote:

https://www.dropbox.com/scl/fi/gyn41v2ncb4wcqmise50d/X128_A4.jpg?rlkey=o3lurjhi0srwa7axsbzijjv4l&raw=1

This is just a test board. mostly to help FPGA development and then
later for production test. It's a mezzanine, a baby board, that goes
into the real product.

It's fun to lay out a small board now and then.


John Larkin
Highland Tech Glen Canyon Design Center
Lunatic Fringe Electronics

I remember when people were compulsive about running horizontal or
vertical traces on specific layers. That made sense when every
thru-hole pin was a via.

My SMT boards seem to be totally haywire... do anything that works.
What surprises me is that it *does* usually work. There's usually a
way to route things. There must be some theory there, topology or
something, but I don't know what it is.

Coding an autorouter must be interesting. But so far they don't seem
to be very good.

As you know, it's known to be an epically hard problem for computers,
and it's unknown how humans manage to do it somewhat better on
small-enough problems.

.<https://en.wikipedia.org/wiki/Routing_(electronic_design_automation)>

Humans may use something like Annealing to plot paths through mazes
and problems alike.

.<https://en.wikipedia.org/wiki/Simulated_annealing>

Joe
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From Newsgroup: sci.electronics.design

On 3/2/26 23:34, john larkin wrote:

On Sat, 28 Feb 2026 15:07:55 -0800, john larkin <jl@glen--canyon.com>
wrote:

https://www.dropbox.com/scl/fi/gyn41v2ncb4wcqmise50d/X128_A4.jpg?rlkey=o3lurjhi0srwa7axsbzijjv4l&raw=1

This is just a test board. mostly to help FPGA development and then
later for production test. It's a mezzanine, a baby board, that goes
into the real product.

It's fun to lay out a small board now and then.


John Larkin
Highland Tech Glen Canyon Design Center
Lunatic Fringe Electronics

I remember when people were compulsive about running horizontal or
vertical traces on specific layers. That made sense when every
thru-hole pin was a via.

My SMT boards seem to be totally haywire... do anything that works.
What surprises me is that it *does* usually work. There's usually a
way to route things. There must be some theory there, topology or
something, but I don't know what it is.

it is like airplanes using different altitude for north/south and
east/west. It means no crossings

Coding an autorouter must be interesting. But so far they don't seem
to be very good.

afaict they can be pretty good, but in the time it take to setup all it
needs to know you could have been done doing it yourself




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