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Making a Xmas tree light bulb tester

Discussion in 'Electronic Basics' started by W. eWatson, Dec 16, 2011.

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  1. W. eWatson

    W. eWatson Guest

    I understand their our tree light testers that allow one to slip a bulb
    into a hole, and an led will tell you if its defective. I found one
    something like that on Amazon, but it's pretty pricey. They may be
    called proximity testers. Can one be made easily?
  2. Jasen Betts

    Jasen Betts Guest

    audio amplifier with capacitive probes,
    when the string powered there will be an increased
    electic field level in the vacitinity of an open-circuit failed bulb.
    and reduced field near the working bulbs.
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