One Transistor Metal Detector
Metal Detector - www.250.org.ua
Circuit of simple but effective metal detector is represented on fig.1. The basis of metal locator is
Hartley oscillator. A searching coil consist of 80 coils of isolated wire. A coil has a diameter 200 mm
fig.2. Communication with a receiver is carried out by coupling aerial (900 mm). Adjust a receiver
and switch on a metal detector. Than adjust turning C2 until the «beating appeared in a receiver.
Thus both devices transform into height sensible metal locator.
Fig.1
1
Fig. 2
2