Electronics > Beginners
Capacitors in a class A amplifier
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bionic:
Class A amplifier with BJT and voltage divider option will drive a speaker. If you bias it right to the max spec for BETA. you will need a darlington pair to juice up the amps at the end stage.
I have done it myself, so I know for a fact that it can be done.
Benta:
But not at 0.7 mA emitter current. We all know it can be done, but in this case: no.

Audioguru:
Yes, the small signal transistor circuit is severely overloaded by a speaker that is only 8 ohms. The transistor amplifier circuit is designed to feed a POWER amplifier that has an input resistance of at least 100 thousand ohms or more. 

The very low value of the 1uF output capacitor is another problem. It cuts frequencies below 20kHz when it feeds an 8 ohms speaker, then it cuts the levels of ALL audio sounds.
james_s:
Easiest to just forget about this circuit and look for a class A audio power amplifier circuit. All that needs to be said here is that this one won't work for what you are trying to do.
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