![]() ![]() ![]() 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). The voltage from the collector terminal to the base is 75V once the emitter terminal is open.The voltage from the emitter to the base terminal is 6V once the collector terminal is open.The voltage from collector terminal to emitter is 50V once the base terminal is open.The features & specifications of the 2N2222 NPN transistor include the following. Pin3 (Emitter): The emitter pin is the third pin of the transistor & it is used to drain out the complete current of the transistor. ![]() The main function of this pin is to control the current from emitter to base. Pin2 (Base): The base pin is a control pin & it is a second pin of the transistor.The main function of this pin is to provide transistor current toward the o/p load. Pin1 (Collector): This is the first pin of the transistor & it is an o/p pin. ![]()
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