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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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