Indicator device for finding hidden wiring and metal fittings. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Indicator device for finding hidden wiring and metal fittings. Encyclopedia of radio electronics and electrical engineering

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

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This universal indicator device is just a godsend for you, as it combines two indicators in all its simplicity. The device allows not only to identify hidden wiring, but also to detect any metal object located in the wall or floor (fittings, old wires, etc.), and thus greatly facilitate the search for a place for hiding equipment.

The device consists of two independent devices: a metal detector and an indicator of hidden electrical wiring (Fig. 1). An RF generator is assembled on the transistor VT1, which is entered into the excitation mode by adjusting the voltage based on VT1 using the potentiometer R6. The RF voltage is rectified by the VD1 diode and puts the comparator assembled on the op amp DA1 into a position in which the HL1 LED goes out and the generator of periodic sound signals assembled on the DA1 chip is off. By turning the sensitivity knob R6, the operating mode of VT1 is set at the generation threshold, which is controlled by turning off the HL1 LED and the periodic signal generator. When a metal object enters the inductance field L1/L2, the generation breaks down, the comparator switches and the position at which the HL1 LED lights up, and a periodic voltage with a frequency of about 1000 Hz is applied to the piezoceramic emitter with a period of about 0,2 s.

Rice. 1. Universal indicator device (click to enlarge)

Resistor R2 is designed to set the generation threshold mode at the middle position of potentiometer R6.

The hidden wiring indicator is assembled on the basis of a micropower operational amplifier DA2. When located near the wiring of the wire connected to the input of the amplifier, the industrial frequency pickup of 50 Hz is perceived by the WA2 antenna, amplified by a sensitive amplifier assembled on DA2, and the HL2 LED switches with this frequency.

Structurally, the device is made in a case soldered from foil fiberglass and painted with nitro enamel. The receiving antennas WA1 and WA2 should be as far away from the hand as possible and located in the head of the device. It should be noted that the part of the housing in which the antennas are located must not have an internal foil coating. SB1 switches the operating modes, the power switch SB2 is combined R6 The battery type "Korund" is used as a power source

Consumption currents for various operating modes:

Standby mode of the metal detector .............................. 2 mA
Turning on the LED and giving a sound signal ..... 10 mA
Standby mode of the hidden wiring finder .............. 0,2 mA
Turning on the LED................................................... .....2 mA

Publication: cxem.net

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