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Q&A Purpose of emitter resistor in a common collector amplifier

If you are AC coupling to a load then you need an emitter resistor to set the DC operating point and quiescent current of the amplifier. An external AC coupled load cannot do this and, it needs to ...

posted 3y ago by Andy aka‭

Answer
#1: Initial revision by user avatar Andy aka‭ · 2020-10-03T09:40:54Z (over 3 years ago)
If you are AC coupling to a load then you need an emitter resistor to set the DC operating point and quiescent current of the amplifier. An external AC coupled load cannot do this and, it needs to be done to ensure the amplifier works as intended.

If your load is a resistor and directly connected to the emitter then you may be able to avoid having an extra emitter resistor.