Home SchematicsBasics Transistor logic probe

Transistor logic probe

by iainhendry

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



transistor logic probe

transistor logic probe

Parts List

QTY  PART-REFS           VALUE                                 
---  ---------           -----                         
1    R1                  10k                                               
1    R2                  1k                                                

1    Q1                  PN2222                                            

1    D1                  LED

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