via this auction
"Rare Texas Instruments SN76477 Complex Sound Generator DIY Synth with stylophone keyboard works perfectly maybe need a better stylus pen for better contact results or clean the contacts works with a 9v battery but you can also plug it in to an ac adapter
sound comes out by JACK 1/4'
the enclosure design made by me you can go inside change battery on anything else just unscrew 4 screws
#The Texas Instruments SN76477 Complex Sound Generator was originally designed to produce sound effects for toys, pinball machines, home and arcade video games, etc
used 70's +80's components for this project
check pics the pdf file how it works"
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