Re: Question on audio amplifiers for a change...

From: Walter Harley (walterh_at_cafewalterNOSPAM.com)
Date: 07/11/04 

Date: 11 Jul 2004 00:28:14 GMT

"Chris Carlen" <crobc@BOGUS_FIELD.earthlink.net> wrote in message
news:ccpsjf02upl@news4.newsguy.com...
> But I almost never see DC coupling on the inputs (or outputs) of audio
> amps, much to my chagrin, as I sometimes want to adapt them to DC use
> without having to hack them.

Inputs, I'm with you. Outputs, it's been a long time since I saw AC-coupled
outputs on a power amp - what kind of amps are you looking at? Seems
everything I see is split-supply, with DC negative feedback to minimize DC
offset error (which is why you need the differential stage to be DC-coupled,
at least on the inverting input), and hopefully with DC detection and
shutdown on the output to protect speakers.

Which of course doesn't help you if you need the amp for something other
than speakers! But it's a bad idea to put much DC into speakers. Can
result in unintended pyrotechnics.

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