I'm still rocking your old card and love it 😀 I must admit I didn't go through every single pages of this thread, can you maybe explain what your objectives are with this new card and what will be the major improvements over the existing one?
I hope to finish the new design today (assigning JLCPCB parts for the order, rechecking all connections, and finalizing the routing). The past two weeks have been quite busy, so I didn’t have much time to work on hobby projects.
I might pick up a Keystone bracket today to do a fit test with a paper prototype.
The new card is basically the same design, just polished a bit and optimized for manufacturing at JLCPCB. Some component part numbers were changed to better match parts available there.
I also added a dedicated oscillator instead of relying on the ISA bus clock, since a user reported that the sound could be slightly off on some systems.
The voltage divider on the PC speaker mix-in will be adjusted to allow higher loudness.
I'm also switching to a Keystone metal bracket. The old design was originally converted from Eagle CAD, which caused quite a few consistency issues when replacing parts, so starting from a clean layout seemed more reasonable.
I also noticed that JLCPCB now offers metal cutting and bending services. In the future it might even be possible to order the bracket directly from them.
These are amazing news. Keep up the great work!
holaplaneta wrote on 2026-03-15, 10:29:These are amazing news. Keep up the great work!
Seconded, glad to see the design is finished.
JAL
Amazing, thanks for the update and great work 😀
5 pcbs are on order for testing purposes, i will report back soon 😀
Cool! Can't wait 😁
I randomly decided to check back on this project, now I’m excited after hearing the update! 😃
A small parcel arrived today!
Unfortunately, I won’t have time to test it until next week(end).
Depending on weather 😀
I’ll also set up a Google Sheet soon where you can add your forum name and other details if you’re interested.
Great!
is posible to buy one?where? thanks
theelf wrote on 2026-04-14, 21:00:is posible to buy one?where? thanks
See Matze's last post: "I’ll also set up a Google Sheet soon where you can add your forum name and other details if you’re interested." So no, you can't buy one yet, but if everything goes according to plan, you will be in the near future 😀.
JAL
Quick Update:
PCB design seems to work. I had to add a patch wire because I made a small mistake, and I replaced the oscillator because I accidentally chose a 3.3 V version from Parts Library, which does not tolerate 5 V.
Unfortunately the 5V part wasn't in stock today.
Thanks for the update!
Hi,
I just can’t manage to finish it in time. I’m running out of time, and I’ve also been run into some health issues, so I haven’t really been able to focus on it properly.
I’m sorry, but I also have several other things I wanted and need to take care of, so I may have to abandon this project for now.
It doesn’t make sense to keep you waiting for an effort that I may not even complete in the next few months.
So I decided to upload all the files so you can build it yourself,
Link in Post #1
Thank you
Matze79
matze79 wrote on Today, 07:11:I just can’t manage to finish it in time. I’m running out of time, and I’ve also been run into some health issues, so I haven’t really been able to focus on it properly.
I’m sorry, but I also have several other things I wanted and need to take care of, so I may have to abandon this project for now.
It doesn’t make sense to keep you waiting for an effort that I may not even complete in the next few months.
Damn, I'm sorry to hear that! Of course your health is more important, I hope you get it sorted out.
So I decided to upload all the files so you can build it yourself
For those that want to try this (not me, I wouldn't know how to hold a soldering iron), is the latest revision of the PCB the final one, or did you intend to update it further?
JAL
