Here’s a pretty simple and fun metal detector you can make. It’s a BFO (beat frequency oscillator) – when metal is detected it changes the sound coming out from the speaker. [via] Link.
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link has changed http://www.easytreasure.co.uk/bfo.htm
HEY!
Great post how to build a metal detector ! I will try that and let you know if it worked …
Ralf