A simple indicator of an alternating electric field. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Consumer electronics
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A simple indicator of an alternating electric field of hidden wiring can be assembled using a voltage divider - resistor R1 and a field-effect transistor channel - as a voltage divider controlled by an external electric field.
A generator based on the K122TL1 microcircuit was used as a controlled pulse generator. The generator load for display is high-impedance headphone type TON-1 (TON-2).
In the presence of an external alternating electric field, the signal induced by the antenna is supplied to the control electrode of the field-effect transistor (gate), which causes modulation of the resistance of the field-effect transistor channel. As a result, the voltage drop across the divider changes, which, in turn, causes generation to occur with a changing frequency.
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