Pnp And Npn Transistor Circuit Diagram. Before starting with the circuit diagram you should know the concept of npn transistor as a switch. The currents in the pnp transistor flow in the opposite directions of the currents in the npn transistor.
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Mainly these matched pair circuits are used in power amplifiers such as class b amplifiers. In an npn transistor output current flows from the collector to the emitter. They work pretty much in the same way with one major difference.
Here the collector terminal always connected to the positive voltage the emitter terminal connected to the negative supply and the base terminal controls the on off states of transistor depending on the voltage applied to it.
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. In npn transistor the direction of movement of an electron is from the emitter to collector region due to which the current constitutes in the transistor. Bipolar transistor are given above with the arrow in the circuit symbol always showing the direction of conventional current flow between the base terminal and its emitter terminal. 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.
