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RFID zapper and RFID detector

Discussion in 'Misc Electronics' started by default, May 7, 2006.

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  1. default

    default Guest

  2. Guest

    Obviously "TwistyCreek" has no clue, and evidently doesn't know what a
    grid dip meter is or how it is used.

    Harry C.
  3. default

    default Guest

    Why do you say that? You're joking right? OK no tube involved so
    there isn't a grid, no "meter" and it won't tune a range of freqs like
    a GD meter. He just mentions it works like one.

    From the schematic it looks as if he measures the current through a 47
    ohm resistor returning the oscillator to ground. If the coil is
    brought near another tank tuned to a similar frequency it should
    increase the current the oscillator requres and that increase is
    detected. That is the general principle of operation of a GD meter.

    I haven't tried it, but it certainly looks viable.
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