Electric field indicator on the IPT analogue. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Indicators, sensors, detectors
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The electric field indicator (see figure) can be used to search for hidden wiring, live electrical circuits, indicate the proximity of high-voltage wires, the presence of alternating or constant electric fields of high intensity.
The device uses a retarded generator of light and sound pulses, made on the analog of the injection-field transistor (VT1, VT2). In the absence of a high-tension electric field, the source-drain resistance of the field-effect transistor VT1 is small, the transistor VT3 is closed, and there is no generation. The current consumed by the device is units-tens of microamperes.
In the presence of a constant or alternating electric field of high intensity, the source-drain resistance of the field-effect transistor VT1 increases, the device begins to generate light and sound signals. So, if you use the output of the gate of the transistor VT1 as an antenna, the indicator reacts to the approach of the network wire at a distance of 25 mm.
The potentiometer R3 regulates the sensitivity of the device, the resistor R1 sets the duration of the light and sound message, the capacitor C1 - the frequency of their repetition; capacitor C2 determines the timbre of the audio signal.
To increase the sensitivity as an antenna, you can use a piece of insulated wire, a telescopic antenna. In the latter case, a zener diode, for example, KS1, or a high-resistance resistor should be connected in parallel with the source-gate junction of the transistor VT191.
Author: M.A. Shustov
See other articles Section Indicators, sensors, detectors.
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