common base, collector, emitter

[lokeycmos]

is there an easy way, or rule of thumb to identify whether a transistor circuit is common base, common emitter, or common collector? Im trying to research and am a little lost. thanks

 

[EternityForest]

To get you started-
The "common" in common base, emitter, etc, refers to which pin of the transistor is "common" to both the input and output.
Quite often the "common" pin will be connected to ground, usually through a resistor.

Common base seems fairly rare except in RF stuff and some specialized audio stuff.

Basically, just look at the inputs and outputs of the transistor. Wikipedia actually has good articles on the different transistor configuration

 

[RoboWanabe]

So basically if your inputs and outputs are the emitter and collector- then you have a COMMON BASE. if your inputs and outputs are base and collector then you have a COMMON EMITTER , and if your inputs and outputs are base and emitter then you have a COMMON COLLECTOR. The common terminal usually connected to ground through a resistor.

I think this is correct?