Why is ground connected to pnp transistor?

crutschow

Joined Mar 14, 2008
25,123
In a common-emitter connection the emitter is tied to AC common, the base is the input, and the collector is the output. For a PNP the base and collector voltages must be more negative than the emitter.

If you only have a plus supply then you can use the PNP as a high-side switch by connecting the emitter to V+ and connecting the base (through a resistor) to ground to turn the transistor on.
 

Audioguru

Joined Dec 20, 2007
11,249
You show a BOX, not a transistor.
A transistor has a base, emitter and collector but your box has none of them.
You also do not show the circuit the transistor is used in.
 
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