Chemelec's Simple BFO Metal Detector

[Funfinder]

3 transistors, 1 piezo speaker.

[Hammerhead]

Best metal detector over the ages:

[kt315]

collecting of BFO's schematics is fully excluded, as absolutely un-perspective. you will not find its on the DVD-ROM with the archive.

[kt315]

russian bfo, on one logic.