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TRANSISTOR CONFIGURATIONS:
Before a transistor can be used, it must be connected into an input circuit (by two wires) and an output circuit (two wires). However, because the transistor has only three terminals, one of the terminals must be in both the input and output circuits; this is then called "The Common terminal". Three circuit configurations are possible and are illustrated in figure.
Note that the word 'common' refers to the transistor component connected to both the INPUT and OUTPUT. In the common emitter configuration for example, the emitter is connected to both the input and output.
Table shows the comparisons of the three transistor configurations
Common Emitter
Common
Base
Common Collector
Current Gain
20 -200
(0.95 - 0.995)
20 - 200
Voltage Gain
100 - 600
500 - 800
<1
Power Gain
Highest
Medium
Lowest
Input Impedance
500 - 2000W
50 - 200W
20kW - 100kW
Output Impedance
10 - 50 KW
100 kW - 1MW
20 - 500W
I/P - O/P Phase
180°
In Phase
Typical Use
Normal Amp
Impedance matching
(low to high)
(high to low)
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