Hi Fred,i have not experimented with this before,but if you read the posts from ESTABAN in the last several months he givs hints on how the pistol detectors from the past worked,he knows what he is talking about.I am building a bfo metal detecter based on a microchip circuit with an external coil of 70 turns of wire,the only problem is it occilates at 88 kilohertz,this may be two low,i will run a sheiled cable from the antenna conection of a hand helded fm raido to a loop antenna near the coil of the bfo.
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