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TWIN_OSCILLATOR_METAL_DETECTOR

2016-08-25 01:40  
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TWIN_OSCILLATOR_METAL_DETECTOR
Metal object near search coil changes frequency of oscillator A1 which is initially tuned to 160 kHz,thereby changing frequency of 1-kHz output derived by mixing with 161-kHz output of A2. Sensitivity, determined largely by dimensions of search coil, is sufficient to detect coins about 1 foot away.-M. E. Anglin, C-MOS Twin Oscillator Forms Micropower Metal Detector, Electronics, Dec. 22, 1977, p 78.