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Simple metal detector on silicon transistors
Metal detector is intended for detection of metallic object (well cover, pipe cut, concealed wiring).
Device diagram
The metal detector consists of a parallel voltage stabilizer (transistors V1 V2) at the generator of high (about 100 khz) frequency on the transistor V4, the detector of HF Oscillation (V5) and the amplifier of a direct current (V6, V7) with the indicator on the LED V8.
Simple metal detector on silicon transistors
The high-frequency voltage from the L2 communication coil is rectified by the emitter transition of the transistor V5. This transistor will be opened when the generator is running and the V6 V7 transistors are closed. The V8 led does not glow. If you bring any metal object to the L1 coil, the oscillation of the generator loosest, transistor V5 closes, V6 V7-open, and the LED will glow.

Details
L1 coils, L2 reel a revolution to the revolution on a round ferriteing terminal from magnetic antennas of transistor radios. They contain respectively 120 and 45 coils of a wire PEV-2 in diameter 0.3 mm. The longer the rod, the sensitivity of the detector is higher.

Establishing
At adjustment of the device by the R5 resistors, R7 (the engine of the R6 resistor in the middle position) set the mode of operation of the generator so that it was on the verge of excitation (led still glows). Then the engine of the R6 resistor put in such position when the LED goes out.

If now priblivit the ferrite rod to the metal object, the LED breaks again. This operation should be repeated several times, seeking to find such positions of the tuning resistors R5 and R7 at which the maximum sensitivity of the device is reached.
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