A simple hidden wiring finder. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Indicators, detectors, metal detectors
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To detect hidden electrical wiring, find a broken wire in a bundle or cable, identify a burned-out lamp in an electric garland, in most cases, a simple device consisting of a field effect transistor, a headset and one or three batteries is quite enough (Fig. 1). The principle of operation of the device is based on the property of the field-effect transistor channel to change its resistance under the action of pickups on the gate output. Transistor VT1-KP103, KP303 with any letter index (for the latter, the housing terminal is connected to the gate terminal). Phone BF1 - high-resistance, with a resistance of 1600 ... 2200 Ohms. The polarity of connecting the GB1 battery does not matter.
When searching for hidden wiring, the body of the transistor is driven along the wall and, by the maximum volume of sound with a frequency of 50 Hz (if it is electrical wiring) or radio transmissions (radio broadcasting network), they determine the location of the wires.
Rice. 1. Schematic diagram of a simple finder
The place of a wire break in an unshielded cable (for example, a power cord of an electrical or radio device), a burnt-out lamp of an electric garland is found in this way. All wires, including the broken one, are grounded, the other end of the broken wire is connected through a resistor with a resistance of 1 ... 2 MΩ to the phase wire of the mains and, starting from the resistor, the transistor is moved along the bundle (garland) until the sound disappears - this is the place broken wire or defective lamp.
The indicator can be not only a head phone, but also an ohmmeter (depicted by dashed lines) or an avometer included in this mode of operation. Power supply GB1 and telephone BF1 are not needed in this case.
Author: V.Ognev, Perm; Publication: cxem.net
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