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RF tone-dip oscillator

LABSPROJECT
Based on a Labs project | October 2011 | Find it here
RF tone-dip oscillator
Use this handy instrument to check out the resonance frequency of those unknown or home-brew inductor / capacitor combinations, or as a simple RF signal generator. It works like magic, without any sort of wire connection to the circuit under test, and, remarkably, uses an audible 'tone-dip' indication instead of the traditional moving coil meter.
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