The load is connected to connector 2 (CON2) where AC mains are given to connector 3 (CON3). Diode D2 is a fly-back diode and protects the coil of the relay. load is active), where resistor R6 is a current limiting resistor that protects LED from burnout due to high current. Glowing LED1 indicates the relay is energized (i.e. The high output at pin 3 energizes relay RL1 for a time interval set by variable resistor VR2. The relay is an electromagnetic device that uses a low-current electrical signal to a current high-power electrical appliance. The switching circuit is designed using a relay and diode. Switching Circuit | Sound Activated 0-30 Minutes Timer Circuit
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