amplifiers

Thread Starter

ronn

Joined Nov 1, 2007
16
What is the difference between an ac amplifier and a dc amplifier?
thanks,
Ron
 

beenthere

Joined Apr 20, 2004
15,808
In general, an AC amplifier will have capacitors between one or more stages to eliminate DC offfset. A DC amp will amplify down to DC.
 

studiot

Joined Nov 9, 2007
5,003
You need to distinguish between

An AC coupled amp v a DC coupled amp

and

an amp for amplifying AC v an amp for amplifying DC.

Been There was talking about the first situation. In general a DC coupled amp presents no capacitors in the signal path and is therfore capable of amplifying DC. It is also capable of amplifying AC - up to its frequency limit. This does not mean there are no capacitors in the amp - there may be bypass and feedback caps.

The second situation is more complicated as certain types of amps exist which amplify DC by converting it to AC - they are called chopper amps.
 
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