Metal detector circuit diagram 7

Published:2011/6/7 19:55:00 Author:Lucas | Keyword: Metal detector | From:SeekIC

The metal detector uses LC single-tube oscillator circuit, and the circuit is shown as the chart. In the circuit, V is oscillating tube, L is the detection coil, C1 is the resonant capacitor. The LC single-tube oscillator circuit works after turning on the power switch S, the speaker of semiconductor superheterodyne radio will issue sounds with the frequency around 1kHz. When the detection coil L detects underground metal, the sound frequency of the speaker becomes high. R selects variable resistor. C1 uses variable capacitor (270P single sealed); C2 and C3 use high-frequency ceramic or glass glaze capacitors. V selects 3AG1 or 3AGll high frequency low power PNP germanium transistor. CB uses 9V tandem battery. Adjusting the resistance of R can make the operating current of machine be about 15mA.



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