Experimental Hardware Neurons

[vladosh]

i just finished these 2 pcb's for this module ,it was on Grant Richter's page before it shut down now the schematics can be found at wayback machine ,i just finished it and it makes me wonder what can be wrong ,the pcb's are double checked ,the wiring is hell ... but i am bit confused with the start/stop switch so that's why i hope if someone can share their thought if it is correct in the original schematic ,i'm bit confused with this manr part of the switch ,(from the first schematic) the first LM3900 keeps getting hot, i thought it was a short circuit but it seems it's something else ,when i turn on (or off) the switch - that is when the LM3900 get's hot and eventually fails ,i really hoped to make this ,here is the files for the module ,any ideas what am i doing wrong ? ,thanks

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Neuronsch1.gif
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Neuronsch3.gif
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PatGen2.gif
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NeuroParts.jpg
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[vladosh]

here is the pattern generator and divider

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DIVIDERPATTERNSPARTS.jpg
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[vladosh]

i just missed this 100pF capacitor ,now it's working , but the switch orientation on the schematic is wrong for sure ,it burned another LM3900