Discussion in 'General Electronics Chat' started by ronn, Dec 10, 2009.
What is the difference between an ac amplifier and a dc amplifier?
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.
You need to distinguish between
An AC coupled amp v a DC coupled amp
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.