Q2 is held cut off since Q1 normally is conducting. When the touch plate is contacted by a large object (human body, etc.), stray 60-?? pickup is rectified by D1 and D2, and produces a negative voltage across R2-C2 and the gate of Q 1. Q1 cuts off, causes Q2 to conduct, and the output goes low.
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New Circuits Main Categories Articles / Projects This is a JFET switch circuit.This circuit uses a MPF102 JFET transistor. In this circuit, the JF...
I'm waitning for my board to arrive from Muzique and was thinking of putting a switch then an LED...
Hey John first of, I want to thank you for your patience explaining everything very well, I am bu...
... JFET and get the same results: NTE312 and MPF102 (radioshack). I understand that if you rever...
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