The simplest sensor. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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Touch control is widely used in modern electronic equipment. A variant of the sensor, available for repetition by novice radio amateurs, is offered by the Czech magazine "Amaterske Radio".
If you touch plate C, the alternating voltage induced in the human body by room wiring amplifies the two-stage ULF on transistors V1, V2, and then rectifies diode V3. A constant voltage of about 4 V, which appears at the output of the sensor, serves as a command signal.
The device uses any low-power silicon transistors, for example, KT342, KT315 with any letter index. Diode - any silicon (D220, D219). Capacitor - KBG-I or BMT. The touch plate is a piece of foil fiberglass with a size of 20X20 mm.
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