Adjustable touch switch. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Radio amateur designer
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The sensitivity of this touch switch can vary over a wide range - you can set the threshold from a slight pressure to a stronger force that needs to be applied to the sensor. Since the sensor is capacitive, it will work through a layer of paint, through paper or plastic.
(click to enlarge)
The input circuit of the circuit contains a master oscillator consisting of a multivibrator IC1, the frequency-setting elements of which are the capacitor C1 and the resistor R2. From the oscillator output, a square wave signal is fed through capacitors C2, C3 to a voltage doubling detector based on diodes D1, D2 and operational amplifier IC2.
Any metal plate isolated from the mass can be used as a sensor. Touching the sensor will increase the capacitances of capacitors C2 and C3, which will increase the voltage at the positive (+) input of the op amp. As a result, the output of IC2 will be set to a low voltage, about 0 V. The D3 LED in the circuit is installed for ease of debugging.
To set the desired response sensitivity, touch the sensor and turn the potentiometer VR1 until the LED goes out. Then slowly turn the potentiometer in the other direction so that the LED lights up. This will be the correct working position. The supply voltage of the circuit is from 5 to 12 volts. One 555 timer can control multiple sensors.
Author: Chris Hegter, George, South Africa
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