
The value of VBE should be 5V and the Base current (IB depends on the Collector current. Resistor value can be calculated using the below formulae. Biasing current should maximum of 5mA more than 5mA will damage the Transistor so a resistor is always added in series with the base pin of the transistor. 2N3904 transistor acts as an Open Switch during forwarding Bias and acts as a closed switch during Reverse Bias. When it is used as a switch it is operated in the Saturation and Cut-Off Region. Compliment of 2n3904 Transistors:īC557,BC556, A1015 are the best (PNP) compliment SMD of 2N3904 Transistor

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