Maybe somebody has a copy of the project and can share it, because it is not available anymore
https://oshwlab.com/szillat/2519-fixed
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Use WaybackMachine:
https://web.archive.org/web/20220517232018/https://oshwlab.com/szillat/2519-fixed
But I especially like our colleague Claudio's project:
https://p-l4b.github.io/2519/
I like this PCB too—it looks compact.
but I couldn’t find the ICs for it.
I got the gerber. Thank you very much for help
Erik Bruchez's interpretation of this board uses the MC14557 in the currently more available SOIC Wide-16 package.
They are hard to find in the standard SOIC package, you might still find them on Chinese platforms, if you're lucky.
Claudio has linked Erik's GitHub on his website.
These adapters work perfectly in my clones and look great too.
IMG_3924.JPG