Proof of concept using Ken Stapleton's brilliant Model 751D circuit (see http://www3.sympatico.ca/kstapleton3/751D.HTM), but powering it with regulated 5V DC and switching it using a G5SB-14 relay and Arduino microcontroller. The Arduino is simply turning pin 13 on for 5 seconds, off for 5 seconds (modified blink demo) triggering the relay to switch, which in turn triggers the 715 circuit. One set of LEDs shows output from 751, the other from the relay.
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