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From: "Phil Allison"
Subject: Re: Combine stereo outputs for twice voltage?
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Thu, 26 Dec 2002 10:26:16 +1100
NNTP-Posting-Date: Thu, 26 Dec 2002 10:16:49 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"James Meyer" wrote in message
> On 25 Dec 2002 05:47:21 -0800, firstname.lastname@example.org (N. Thornton) wroth:
> >Peter Nielsen wrote in message
> >> I am aware of paralleling amp outputs for more current, and bridge
> >> configurations ... but is there anyway to add indentical signals from
> >> the stereo outputs of an audio amp to derive one channel at twice the
> >> voltage?
> >> Peter Nielsen
> >> SCU
> >Yes. Feed your signal into the 2 channels in antiphase, ie one channel
> >is inverted version of the other. Then attach your speaker from Left+
> >to Right+, with no ground connection. You'll need twice the speaker
> >impedance that the amp would normally run with. Its called a bridge
> >FWIW there are other ways to do it, but this is the practical one.
> >Regards, NT
> The original question was for "identical signals" from both channels.
> That means that antiphase signals can't be used.
** That is taking the OP *very* literally.
Peter also stated that he was
> familiar with bridge circuits so he was probably looking for a different
** But never said why or the application. Like most PITAs.
> If the amplifier in questiion has transformer coupled outputs
** Huh ? A vlave amp ?
and if the
> chassis ground that is usually made at one end of the output winding can
> disconnected without changing the negative feedback,
** With no feedback?
then it's a simple matter
> to connect the windings in series-aiding for twice the voltage and each
> will have identical signals.
** Damn sight easier to invert one channel's input and use bridge mode.
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