![]() The applications of this circuit mainly include lamps, locks, doors & safety boxes. Once the touchpoints in the circuit are touched, then a small number of current supplies throughout the circuit to activate the LED. A variable resistor with a 200KΩ value is used to regulate the circuit sensitivity. If you use a relay in the circuit in place of LED & resistor after that the same value of relay you have to use like the i/p voltage. This simple circuit is very helpful to turn on a relay in place of LED & resistor to connect any appliance or load to operate through it. The touch switch circuit using the 2N2222A transistor circuit is shown below. These three configurations are very helpful for amplifying voltage, current & power very easily in different applications based on the requirement. The configuration modes of the 2N2222 NPN transistor include common emitter (CE), common collector (CC) & common base (CB). ![]()
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