Re: Question on audio amplifiers for a change...
From: Chris Carlen (crobc_at_BOGUS_FIELD.earthlink.net)
Date: 07/10/04
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Date: Sat, 10 Jul 2004 16:03:10 -0700
Walter Harley wrote:
> "Paul Burridge" <pb@notthisbit.osiris1.co.uk> wrote in message
> news:i6vte0tuju7c2fg1nq2seedmumf16csemd@4ax.com...
>
>>Hi all,
>>
>>Why does the first stage of all commercial audio amps seem to consist
>>of a differential (long-tailed) pair? AFAIA, the chief characteristic
>>of this configuration is just to eliminate 'mush' on an input signal,
>>like if it's come from a long line input and has a high noise floor,
>>which clearly isn't the case between your CD/tape-deck/phonograph or
>>whatever. So why?
>
>
>
> Because a differential input stage is a useful way to apply global negative
> feedback, which is in turn a good way to improve the response
> characteristics of the amplifier.
>
> And because a long-tailed pair permits DC coupling of the input.
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.
Good day!
-- _____________________ Christopher R. Carlen crobc@earthlink.net Suse 8.1 Linux 2.4.19
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