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A Circuit Diagram of Discrete Elements of the Touch Switch

2014-11-27 04:50  
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The circuit of discrete elements of the touch switch has been shown in picture below. This circuit is composed of an induction magnifier, a memorizer and an AC driver. As soon as a finger touches the insulted plate, a small AC signal will be added to the gate of Tr1, the signal will produce square wave on R4 after being magnified, and then it will charge to C3 through Tr3, after that it will produce direct input voltage on R8, the voltage will be added to single crystal transistor Tr6. Finally, Tr6 will give rise to remittent oscillation and trigger the controllable silicon. The longer the switch is touched, the larger of voltage on R8 will be. As soon as the finger leaves the switch, load will be cut off.