Originally Posted By: sn00p
Cool. Glad you liked. smile

That board is totally non exciting though! It's just a uart (TTL level) to 20ma converter (vending machine interface).


Oh, you mean like this circuit, from whence I "liberated" a couple of optoisolators for an early prototype of my Frankenswitch V2 circuit:



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Description: Volker-Craig C-104: RS232C to 20mA current loop adapter, using a pair of IL5 optoisolators.

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Description: Description that accompanied the cable/connector assembly. I got this for free at a factory "junk" closeout in 1983.