Zener Diode Test Ckt

Discussion in 'The Projects Forum' started by leocircuits, Sep 2, 2016.

  1. leocircuits

    Thread Starter New Member

    Mar 15, 2016
    7
    0
    Looking to Build a Zener Diode Voltage Tester.

    I have a Bag of Zener Diodes, I would like to Test there Wking Voltage & Label
    them for Future Use......
     
  2. #12

    Expert

    Nov 30, 2010
    16,355
    6,853
    Find a voltage supply, calculate a resistor to allow about 20 ma, measure some zeners.
     
  3. SLK001

    Well-Known Member

    Nov 29, 2011
    825
    229
    Quick and dirty solution:

    ZENER.jpg
     
    absf likes this.
  4. absf

    Senior Member

    Dec 29, 2010
    1,493
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    That's how I test my unknown zeners too. Allen
     
  5. crutschow

    Expert

    Mar 14, 2008
    13,056
    3,245
    If you have a supply that has a current limit control, then set the current to 20mA at it's maximum voltage setting and then you don't have to adjust the supply for any differences in the voltage of the zeners being tested.
     
  6. leocircuits

    Thread Starter New Member

    Mar 15, 2016
    7
    0
    I love the ckt, Very Simple to Build,,...
     
  7. bertus

    Administrator

    Apr 5, 2008
    15,652
    2,348
    Hello,

    You could also use a constant current source.
    This page has a circuit given:
    http://www.dddac.de/at05.htm

    Put the zener on the output of the constant current source and measure the voltage accross the zener.

    Bertus
     
    dl324 likes this.
  8. hp1729

    Well-Known Member

    Nov 23, 2015
    1,963
    219
    I agree with the variable voltage source. Start low and bring up the voltage until you reach 20 mA. (Monitor the voltage across the resistor to determine current.)
    Track voltage across the Zener and current through it and compare that curve to other known Zener diodes. A good lesson here in that you can tweak the current through the diode to get a precise voltage.
     
  9. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,040
    287
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