This is a custom Paia Fatman that I built several years ago. The basic Fatman kit is actually still being sold today. Of course, one of the neat things about building a kit is all the learning you do in the process, plus you can make mods. Check out the Paia web page for ideas. My Fatman has lots of mods, including the ASR LFO, subharmonic generator, PLL VCO, ASR/ADSR reverser, and pitch LFO. The Fatman design is based around an 8031 microprocessor, but I used an Intel 8051 which has an 8Kx8 EEPROM built in so the external memory is not required - that’s why there are two empty sockets on the PC board in the picture above.
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