|Created||March 28, 2013|
|Last modified||March 28, 2013|
|Tags||checker high logic low probe voltage|
Logic Probe using op-amps for the voltage tester.
R1 and R2 can be used to set up your logic levels. When the probe sees a logic level that makes the negative input of the op-amp more positive than the positive input, it outputs a "low". Lighting the LED.
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