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Simple metal detector
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electronic circuit diagram: BFO METAL DETECTOR
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The system'
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sch.htm
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vk3ye dot com - Hear amateurs on your cheap shortwave radio
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455KHz bfo schematic needed with transformers
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The BFO Board
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Simple BFO Metal Detector - Improved Circuit Design - YouTube
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BFO Circuit under Hartley Oscillator Circuits -1212- : Next.gr