Logic Probe

From Adam Colton
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http://hackaday.com/2016/12/24/dead-bug-logic-probe-in-a-magic-marker/

I like the dead bug design, and most of the features.

Things I want:

  • Red for high, green for low
  • Convert signal to tone (at high impedance)

V1

I like the dual opamp design. It's simple. If I have a working buzzer, I can wire that up in parallel with the ON LED. Otherwise, the lights are enough.

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