D3 relay work light, indicating 5V voltage in a normal state. D2 is a relay indicator, indicating the relay is attracted state (at both ends of the relay coil voltage). Parallel capacitor C1 relay, the voltage across the relay coil is released sliding, pull prevents excessive frequency affect life expectancy. D1 relay antiparallel diodes prevent the relay after the release to generate a high voltage peak, the breakdown of static sensitive devices. R3, R1 is working relay, pull the indicator to prevent high breakdown voltage power indicator. Q1 is a PNP transistor, for MCU I/O port of the current amplification. R2 is a resistor in series with the transistor base, to prevent the input signal is too strong. RL1 is 5V relay, L1 is 220V incandescent, or can be connected to AC 220V 10A DC 30V 10A control appliances. 1HZ square wave signal source directly to the microcontroller s I/O port, control the strong power on or off.

5V继电器驱动电路
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