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Zener Diode Tester

By on September 18, 2007

This Zener diode tester was designed and tested by by K. Udhaya Kumaran. It can test zener diode from 3.3v to 120 volt!

This project is in PDF file so remember to print it out for future use-just in case if you have some spare time. Enjoy! Click here to visit the website.



  1. udhaya kumaran . k

    June 5, 2009 at 3:50 am

    i am author for zener diode tester , ( testing zener 3.3v to 120v )

    thank u for discusing my artical in your forum

    thanking you

    udhaya kumaran

  2. admin

    June 8, 2009 at 5:17 pm

    Hi Udhaya,

    You are welcome and nice knowing you.


  3. DAVIS

    December 18, 2009 at 8:08 am

    id like to knw if Mr. Udhaya here is the one who has designd the broken wire detector circuit in EFY. If so i'd like to know a few more details abt the circuits, pls give me a way to contact you.

  4. admin

    December 22, 2009 at 11:29 am

    HI Davis,

    You can try to email him at udhayakumarankgf(at)



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