Class A

120

01:57:35

Pro:
Simple to build.
Very low harmonic distortion.
Con:
Max efficiency only 25%
by sinus and max modulation.

published 10 years ago

WTFCircuit

10 years ago

The distortion start under 100Hz, too much for a class A

flowDAQ

10 years ago

Looks like class A to me, Wikipedia has some information also https://en.m.wikipedia.org/?title=Amplifier#Class_A

flowDAQ

10 years ago

I don't see distortion at 100Hz, just some phase shift and a little drop in gain, perhaps it was updated?

thebugger

10 years ago

If you want low distortion you have to give up simplicity and vice versa. The same stands for efficiency versus distortion.

flowDAQ

10 years ago

I don't normally think of gain and phase changes as distortion, but wikipedia said they are. So maybe this simple class A amp should say low harmonic distortions to be more specific.

tpfohl

10 years ago

Yes I meant low harmonic distortion. Sorry.

thebugger

10 years ago

It's not even that. As i said, even in class A there are certain requirements to obtain low distortion. For starters the collector resistor introduces very high amount of the overall noise. A constant current source would be more suitable for instance. The emitter should also have a constant current source. Basically all but the bias chain should not be a passive resistance.

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