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In the Common Collector or grounded collector configuration, the collector is now common through the supply. The input signal is connected directly to the base, while the output is taken from the emitter load as shown. This type of configuration is commonly known as a Voltage Follower or Emitter Follower circuit. 
The emitter follower configuration is very useful for impedance matching applications because of the very high input impedance, in the region of hundreds of thousands of Ohms while having a relatively low output impedance.

Show in the picture for the Common collector configuration.

Now answer the questions and add these to 
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  1. How the common collector configuration works ?
  2. Why the impedance matching applications are very useful of this type ?

To take information about  common collector configuration  please go below here.




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