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Completed The Zener Diode Tester Project

By on October 11, 2008

One of my ERG member from Malaysia has completed the zener diode tester project and the photo below is to show you how his tester look like. He has tested the tester and work perfectly fine. Congratulation Mr Andi! If you have any photos of zener diode tester you want to show to the readers of this blog please send it to jestineyong(at) If you would like to build this zener diode tester, you may subscribe to my monthly repair newsletter at and get the article on how to build one with the help from schematic and photos.

zener diode tester

Now not only did Mr Andi had completed the project, he also further build the dick smith flyback tester as shown from the picture:

flyback tester

For your information Mr Andi is a TV repairer and has his own repair place and love electronics very much. If you look at the zener diode tester picture you could see that his design was different from mine. It is not necessary have to be exactly the same as my design. One has to be creative and you could come out with all sort of designs if you wish to. Thanks again Mr Andi for your contribution to this blog.



  1. romeo101

    December 14, 2008 at 7:11 pm

    is there any shematic diag for this kind of ring tester not the new one from the anatek?

  2. admin

    December 16, 2008 at 8:23 pm

    Hi romeo,

    Try this website:


  3. Diosdado sumaylo

    July 28, 2012 at 4:23 am

    where can get the diagram and pcb of zener dioce tester

    • Jestine Yong

      July 28, 2012 at 8:37 pm

      Hi Diosdado.
      I have compiled it under bonus for power supply ebook buyer at


      • jayson

        November 20, 2019 at 4:52 pm

        hi sir im from Philippines and im a very fun of this device for use in repair can u help me about the pcb layout? thanks

        • Jestine Yong

          November 20, 2019 at 8:56 pm

          Hi Jayson,

          It is now part of the bonus report when you buy the power supply repair guide:




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