Drivers like an LED driver, Relay Driver, etc.The utmost transition frequency of BC547 is 300MHz so that it will perform well within RF circuits.Thus, it can use in different electronic circuits This BC547 transistor is used general-purpose, widely used and it is used as an alternative as well as a substitute to different kinds of transistors.Always verify the three terminals of the transistor while connecting in-circuit otherwise the performance can be reduced and the circuit can be damaged.Īpplications of BC547 transistor include the following.Maintain the temperature from the above +150oC to -65 oC.The base resistor should be used for providing the necessary current intended for saturation.The voltage should not exceed to 45V DC across the transistor.To run the transistor for a long time in a circuit, it is very important that it doesn’t increase the load more than 100mA.The precautions of this transistor include the following. When the switch S1 is pressed for a moment the base terminal of transistor Q3 will be pulled up then the L2 will turn off because of the Q4 transistor’s pull-down base throughout the R8 resistor so the relay 元 will be turned off. 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.
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