Touch switch using 555 timer
Aim of the Experiment :
Touch switch using 555 timer
Minimum Requirements :
555 Timer IC
9V battery or power supply
Voltage Regulator (7805)
330 Ohm resistors
LEDs
Connecting wires
Working principle:
This simple Touch Switch is developed by using 555 timer IC operated as a MONOSTABLE vibrator. Here the stable stage is LOW, so the timer outputs low after the trigger is removed. Basically, in this circuit, we will have a LED which turns ON when we touch a pin of the timer. The LED will be ON for the time during which the trigger is present. Once the trigger is removed the LED turns OFF.