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Zener Diode Tester

By on June 11, 2013

My repair friend Andre from Trinidad and Tobago had successfully built a zener diode tester. The diagram was taken from the bonus report found in the Power Supply Repair ebook website at  Besides testing zener diode, this tester can be used to test on voltage regulator IC, LED, Diode, Small non polarity capacitor, battery voltage and continuity. This tester was nicely built and you can see the photos below.

zener diode tester


zener diode meter

zener diode multimeter

zener diode tester



  1. Amir Mukhtar

    August 5, 2013 at 1:58 am

    Sir, Jestine

    Nice Sharing and Practical Information .

    thanks you
    Amir Mukhtar Ashrafi

    • Jestine Yong

      August 5, 2013 at 9:34 am

      Hi Amir,
      You are welcome.


  2. Keith Ford

    February 5, 2014 at 2:30 pm

    been great if the schematic had been in the article. Thanks for the read!

  3. nahum baylon

    June 9, 2014 at 12:57 pm

    why not share the schematic diagram of this zener diode tester so we can try to build our own and prove that it really works out


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