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[[[[[ Varistor ]]]]] or VDR

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  • [[[[[ Varistor ]]]]] or VDR

    Hi all,

    I saw a VDR in a circuit some time ago, but I don't know what they do....?
    Could someone explain about them?
    What advantages they have?
    Is it possible to use two zener diodes (by fasten both kathodes of them together) insead of a VDR???


    Best Regards,
    1843

  • #2
    Voltage Detector Reset. Basically, it monitors a voltage and if it falls below a threshold the detector triggers an output. In other words, it's a comparator. No, the zeners would not do the same thing.

    - Carl

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    • #3
      Hi Carl,

      I have seen VDR also stand for Voltage Dependent Resistor which is basically a varistor.

      Here is a link to some info about them.

      http://www.epcos.com/inf/70/db/var_01/00190041.pdf

      Reg

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      • #4
        Hmmm... OK, also a Video Digital Recorder.

        So a VDR looks a lot like a back-to-back zener, but instead of a sharp avalanche it has a more resistive slope.

        - Carl

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        • #5
          Many thanks to Carl and Reg,
          Cheers

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