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logic probe
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Status: OK

It is used for testing logic levels.

Vcc=3-15V

Source: http://www.sentex.net/~mec1995/circ/probe2.htm

.. image:: http://www.sentex.net/~mec1995/circ/probe2.gif


Differences:

 - R2=4M7
 - R3=1k
 - R4=1k
 - R5=1k
 - LED + 1k for Power