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Touch switch circuit diagram with transistors

This electronic touch switch circuit is based on two transistors an can activate a relay , when the touch sensor is pressed .
The touch sensor can be constructed using a small piece of a printed circuit board ( two small tracks with a 2 mm distance between each other ) .
This circuit is powered using a 12 volts DC power supply , so the relay used for this project must be a 12 volts relay . This circuit is working very simple , when both plates of the sensor are touched the skin resistance will activate the circuit .

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Circuit Diagram: 
Touch switch circuit diagram electronic project using transistors