Looks perfect, run it! 😁

Gotta stop for today, did a few footprint corrections and started a bit the part placement.

Goodluck ! 😀

What Software do you use ?
Ah ok, KiCad.

Does it contain a Auto Router ?

Yes it does, but autorouters are for wimps. 😀
I'm about 50% through but stuff at work keeps interfering with my progress.

Any update on this project? 😀

Any progress, stamasd? I ask because I will be ordering some prototype boards for another project, so I think I may whip up a board for this as well. Mine would be with the autorouter though 😜

Sorry, no progress. I got sidetracked by many things.

One word of caution about the autorouter. I tried it once, and it made a mess.

Here's a simplified and cleaned up schematic. Putting this out there in case anyone finds errors before I start laying out a board...

Awesome work!

Just a teaser for you guys...

Cool beans! When can we order the PCB? 😁

When I'm sure the design actually works 🤣
I'm going to order some when I get paid (Friday) and build one to test.

stamasd wrote:

Cool beans! When can we order the PCB? 😁

Sent you a PM, I want to help moving things along.

Did you end up going with the last posted layout?

I did. The prototype boards I ordered should be here this week.

gdjacobs wrote:

Did you end up going with the last posted layout?

So, I was thinking about this one... what do you think about putting a Wavetable Header on the card and wiring an (optional?) audio-out jack for use with a Wavetable card? Would that be actually useful, or am I thinking up solutions to problems that don't exist?

You're not the first to bring this up. I think it's a good idea. Someone else may have to take on that part of the project though as analog design is not really my strong suit 😎

RJDog wrote:

So, I was thinking about this one... what do you think about putting a Wavetable Header on the card and wiring an (optional?) audio-out jack for use with a Wavetable card? Would that be actually useful, or am I thinking up solutions to problems that don't exist?

ab0tj wrote:

Someone else may have to take on that part of the project though as analog design is not really my strong suit 😎

Well, I won't claim to be an expert, but it's not that difficult. Just have a 270ohm (or maybe 220ohm, as you have some of those on the board already) resistor inline with the audio signal lines for current protection, and ideally some ground traces adjacent to the signal traces for some EMI protection. Based on some quick googling, it looks like the audio signals are on pin 20 (right) and pin 24 (left) of the wavetable header...

I approve of this 😀 Nice effort.
Always nice to see people design new hardware to replace old solutions or ease up the market.

Not sure if it's an issue with the preview or you already did that, but I'd remove all soldermask near the ISA connector, it tends to wear off over time there and can isolate pins when it has flaked off.
Also: maybe add a bit of 'via stitching' to additionally connect both ground planes (probably not required, but looks nice)?

RJDog wrote:

Well, I won't claim to be an expert, but it's not that difficult. Just have a 270ohm (or maybe 220ohm, as you have some of those on the board already) resistor inline with the audio signal lines for current protection, and ideally some ground traces adjacent to the signal traces for some EMI protection. Based on some quick googling, it looks like the audio signals are on pin 20 (right) and pin 24 (left) of the wavetable header...

Fair enough, I'll look into adding that once I verify that this 'prototype' works.

shock__ wrote:

Not sure if it's an issue with the preview or you already did that, but I'd remove all soldermask near the ISA connector, it tends to wear off over time there and can isolate pins when it has flaked off.
Also: maybe add a bit of 'via stitching' to additionally connect both ground planes (probably not required, but looks nice)?

Thanks for the kind words and suggestions. I had not done either of these with the current iteration of the design, but I will keep this in mind before I send off the gerbers to get any more boards made. Both suggestions make sense.