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How does a screwdriver tester work?

Discussion in 'Electronic Basics' started by ap, Jul 5, 2003.

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  1. ap

    ap Guest

    Can anyone here may explain to me how does a neon screwdriver tester work?
    I know that there should be a current that flows through the neon bulb and
    then to a resistor and then through my body. All is quite understandable
    while I'm grounded, but why the bulb lights (rather dimly) while I'm not
    grounded at all (suppose I'm testing while on a wooden ladder with rubber
    feet)??? Does the current flows into me?

    Another question: Should it works also with dc?

    Thanks, ap
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