FYI I used an LM2596 dc to dc converter to drop the 13.8 vdc from P1 to 5vdc to feed my TDA 2030a audio amp, my SSM 2167 mic preamp/compressor and theRaduino ?board.
I bent the raduino1 pin 4 up so it doesn¡¯t set into the socket thus isolating the 13.8 supply from the raduino board.
seems to work well.
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73
Mick VA3EPM?
Mick