Cmos logic probe

Posted on Mar 27, 2013

The logic probe can indicate four input states, as follows: floating input—all LEDs off

Cmos logic probe
Click here to download the full size of the above Circuit.

logic 0 input—D2 switched on (D3 will briefly flash on); logic 1 input—Dl_ switched on; pulsing input—D3 switched on, or pulsing in the case of a low frequency input signal (one or both of the other indicators will switch on, showing if one input state predominates).

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