Minimal metal detector

Posted on Nov 4, 2012

This circuit is on oscillator with LI being a 4` diameter coil of 35 turns of #26 magnet wire. Metal in proximity to LI will cause the oscillator to shift frequency. An AM transistor radio is used to detect the frequency shift.

Minimal metal detector
Click here to download the full size of the above Circuit.

The transistor is the MPS5172 or use a similar.

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