Transistor logic probe

2,286

This is a simple logic probe based around a transistor

A Logic low will switch the LED off

A logic high will switch the LED on

Schematic

 

transistor logic probe
transistor logic probe

Parts List

QTY  PART-REFS           VALUE
---  ---------           -----
Resistors
---------
1    R1                  10k
1    R2                  1k
Transistors
-----------
1    Q1                  PN2222
Diodes
------
1    D1                  LED

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