Category: Zener-tester


I was tired of searching a resistor and building a small circuit each time I had to test a zener diode, so I build this zener tester in an old project box.
Zener tester schema

D1 is the diode under test

D2, D3, D4 are put in to protect the volt meter, because the range of the meter is limited to 30V.
Foto Zener tester