A simple metal detector based on the UCY7400 chip. Scheme, description

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A simple metal detector based on the UCY7400 chip. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / metal detectors

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The metal detector, the scheme of which is shown in fig. 2.25 can be assembled in just a few minutes. It consists of a small number of elements:

two almost identical LC-oscillators made on the elements DD1.1-DD1.4;
detector according to the scheme of doubling the rectified voltage on the diodes VD1, VD2;
high-resistance (2 kOhm) headphones BF1.

A change in the tone of the sound of the head phones indicates the presence of a metal object under the coil-antenna.

A simple metal detector based on the UCY7400 chip
Rice. 2.25. Schematic diagram of a simple metal detector on a UCY7400 chip

Schematic diagram

The generator, assembled on the elements DD1.1 and DD1.2, is self-excited at the resonance frequency of the series oscillatory circuit L1C1, tuned to a frequency of 465 kHz. Off-the-shelf elements such as those from the IF filter of a superheterodyne receiver can be successfully used.

The frequency of the second generator (DD1.3, DD1.4) is determined by two components:

the inductance of the antenna coil L2 (30 turns of PEL 0,4 wire on a mandrel with a diameter of 200 mm);
the capacitance of a capacitor of variable capacitance C2, which allows you to configure the metal detector to detect objects of a certain mass before searching.

The beats resulting from mixing the oscillations of both generators are detected by the diodes VD1, VD2, filtered by the capacitor C5 and fed to the headphones BF1.

Construction and details

The whole device can be assembled on a small printed circuit board, which makes it very compact and easy to handle when powered by a pocket torch coin battery.

When repeating the metal detector, you can use the K155LA3 chip, any high-frequency germanium diodes and KPI from the Alpinist radio receiver.

Author: Janeczer A.

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Alexander the Compromiser
"A simple metal detector on a UCY7400 chip" Possible replacement of detector diodes - D9B.

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