Npn Transistor Switch Circuit. It is composed of semiconductor material usually with at least three terminals for connection to an external circuit. When a sufficient voltage vin 0 7 v is applied between the base and emitter collector to emitter voltage is approximately equal to 0.
The npn transistor is designed to pass electrons from the emitter to the collector so conventional current flows from collector to emitter. I also believe i may not need the base resistors in this circuit. Npn transistor npn transistors are three terminal three layer devices that can function as either amplifiers or electronic switches in the previous tutorial we saw that the standard bipolar transistor or bjt comes in two basic forms.
In an npn transistor current starts flowing from collector to emitter only when a minimum voltage of 0 7v is supplied to the base terminal.
Reverse bias is needed in the collector junction of an npn transistor figure 3. This is known as forward bias. Before starting with the circuit diagram you should know the concept of npn transistor as a switch. An npn n egative p ositive n egative type and a pnp.
