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Wiring Diagram for LM-3S-G with Phoenix Sound board

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JRad:
I'm with Greg.  On a recent model, if the internal circuit is not being powered, you will get nothing on the chuff wire.  I had to deal with this when I gutted the tender electronics from my C-19's.

Early optical chuff circuits produced a  +V pules that needed to be converted to a ground pulse with a transistor for use with Pheonix and most other sound boards. Later models, like the C-19, changed to a ground pulse which sound boards are happy with. But in order to get either, the optical circuit needs to be powered.

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