Sensor switch. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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The proposed device allows you to turn on or off a wide variety of household appliances with one touch to the E1 sensor - a metal plate (see figure). It is simple in design and can be used in 3...15 V battery-powered appliances.
How does a switch work? When you touch the sensor with your finger, the DD1.1 trigger generates an output pulse that switches the DD1.2 trigger to another state. If, say, after the first touch of the sensor, there was a logical 12 at trigger pin 1, then after the second touch, a logical 0 will appear on this pin.
This signal controls the operation of the electronic switch, made on the transistor VT1 and relay K1. If the trigger output is logical 1, the transistor opens, the relay is activated and with its closing contacts (not shown in the diagram) supplies power to the load. When a logic 0 appears at the trigger output, the relay contacts open, de-energizing the load.
The microcircuit can be used similar to other series, the transistor - of the specified series with the highest possible base current transfer coefficient, the relay - RES-15, passport RS4.591.003 or RS4.591.004 (with a supply voltage of more than 10 V). The load current must not exceed the maximum allowable current through the relay contacts.
The reliability of the device will be higher if the VD1 diode is replaced with a resistor with a resistance of about 100 kOhm, and a resistor with a resistance of 10 MΩ is connected between the sensor and the common wire. The first of them protects the input of the microcircuit from static electricity, and through the second, the logic level 0 enters the input. In addition, you can do without the resistor R2 and connect the input R of the DD1.2 microcircuit to a common wire.
Author: M. Kutsev, village of Volchno-Burla, Altai Territory
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