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From: szepesi@fluke.UUCP (Les Szepesi)
Newsgroups: net.audio,net.analog
Subject: Re: Amp designs (Re: current-dumping amplifiers)
Message-ID: <1760@vax3.fluke.UUCP>
Date: Fri, 29-Aug-86 13:34:39 EDT
Article-I.D.: vax3.1760
Posted: Fri Aug 29 13:34:39 1986
Date-Received: Sat, 30-Aug-86 10:06:19 EDT
References: <481@imagen.UUCP>
Organization: John Fluke Mfg. Co., Inc., Everett, WA
Lines: 25
Xref: mnetor net.audio:2431 net.analog:848

> [...]
> One idea that I kicked around has been to difference the main and feed-
> forward paths by feeding the output of the main driver to one speaker wire,
> and the output of the error-signal amplifier to the second speaker wire (like
> a diff amp). [...] 
> 
> 
> Kok Chen
> Imagen Corporation	(we don't manufacture amplifiers; in fact, we don't
> 			 even do anything remotely analog!)

The biggest problem I see with this is that all the current coming from the 
output of the "main driver" must also pass throught the output of the "error-
signal amplifier". (KCL) This now implies an error amplifier with very good
linearity, THD, etc that also can source and sink large currents. The whole
point of the original topology was "To build a low power, quality amp is 
cheaper and easier than to build a high power, quality amp."

Les Szepesi
-- 
Les Szepesi		decvax\
John Fluke Mfg Co.	ihnp4  >!uw-beaver\
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