12V Relay Based Timer Switch

BC547 Transistor

The heart of this 12V Relay based Timer Switch is a BC547 NPN switching transistor. BC547 is one of the most common switching transistors for low to medium voltage switching applications. It is an NPN transistor, meaning that the IC collector and emitter will be left open during reverse bias operation and during the forward bias, the base pin will be held at the ground and will be closed when a signal is provided to the base pin.

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Step 1: Useful Steps 1)

Solder the 1000uF capacitor on the PCB board.

2) After that, solder the pushbutton on the PCB board.

3) Solder the BC547 NPN transistor on the PCB board.

4) After that, solder the 10K pot on the PCB board.

5) Solder the 1N4007 diode on the PCB board.

6) After that, solder the 5V SPDT relay on the PCB board.

7) Solder the input and output terminal block connector on the PCB board