An NE602 acts as a heterodyne detector and Ql as a sense oscillator. When Ll is brought near metal, it causes a charge in loop inductance, shifting the resonant frequency of Ll C6/C7. Ll is 5 turns #20 wire on a 9` diameter wood or plastic form.
Simple Metal Detector
Written By MR HARI on Minggu, 19 Mei 2013 | 11.07
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