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The Q4 transistor is ON because of the voltage at the collector terminal of the transistor Q3 using R8 resistor The base terminal of the Q3 transistor will be pulled downward, and then L2 LED will blink to indicate power is ON. When the S2 switch is ON, the Q4 transistor will start conducting & relay ‘元’ can be latched. Thus, the base terminal of the Q3 transistor is high throughout the R7 resistor to maintain in cut-off condition. Once the supply is given to the circuit, the relay gets off mode. The circuit is activated once the power supply is given to the circuit. The ON/OFF touch switch using transistor BC547 is shown below.

It is obtainable in semiconductor package like-92.

Continuous Ic (collector current) = 100mA.

The features of the BC547 transistor include the following. Whereas in a reverse bias mode, it doesn’t allow the flow of current through it because it works as an open switch. In a forward bias mode, the two terminals like emitter & collector are connected to allow the flow of current through it. The working states of BC547 transistor include the following. The amplifier circuit uses three configurations which include the following.įrom the above three configurations, CE is the most widely used configuration.

Pin3 (Emitter): The current supplies out through emitter terminalĪ Transistor works as an amplifier while functions in the active region to amplify voltage, current, and power at various configurations.

Pin2 (Base): This pin controls the transistor biasing.

Pin1 (Collector): This pin is denoted with symbol ‘C’ and the flow of current will be through the collector terminal.The BC547 transistor includes three pins which include the following.