Metal detector on one chip. Scheme, description

Metal detector on one chip. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Indicators, detectors, metal detectors

The metal detector, the schematic diagram of which is shown in Fig. 1, is assembled on only one K176LP2 microcircuit. One of its elements (DD1.1) is used in the exemplary generator, the other (DD1.2) - in the tunable one. The oscillatory circuit of the exemplary generator consists of a coil L1 and capacitors C1, C2, and a tunable one consists of a search coil L2 and a capacitor C4; the first is rebuilt with a variable capacitor C1, the second - by selecting the capacitance of the capacitor C4.

(click to enlarge)

On the element DD1.3, a mixer of oscillations of the exemplary and variable frequencies is made. From the load of this node - a variable resistor R5 - the difference frequency signal is fed to the input of the element DD1.4, and the audio frequency voltage amplified by it is fed to the headphones BF1. The device can detect a five-kopeck coin (pre-perestroika monetary unit) at a depth of up to 60 mm. And the cover of the sewer well - at a depth of up to 0,6 m.

Publication: N. Bolshakov, rf.atnn.ru

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