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opto-auto-latch | PCB Design

Version 1 - Last update: Oct 26, 2015

short ( push button) to gnd to latch and reset d0 or d1 ( call1, call2 and cancel) . All gnd related.

47uF makes delay for latching, about half a second ( debounce, noise, long wire, etc), when push button has 1k series resistor.

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