Xref: utzoo rec.audio:6184 sci.electronics:2899
Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!pasteur!agate!thoth23.berkeley.edu!chan
From: chan@thoth23.berkeley.edu
Newsgroups: rec.audio,sci.electronics
Subject: Re: How about some basic power amp schematics?
Message-ID: <9517@agate.BERKELEY.EDU>
Date: 3 May 88 00:03:06 GMT
References: <265@gt-eedsp.UUCP>
Sender: usenet@agate.BERKELEY.EDU
Reply-To: chan@bartleby.berkeley.edu.UUCP (Jeff Chan)
Organization: University of California, Berkeley
Lines: 21
Keywords: High End, Hafler, Levinson, Krell

In article <265@gt-eedsp.UUCP> drabik@gt-eedsp.UUCP (Timothy J. Drabik) writes:
>issues of The Audio Amateur that deal largely with power amps? 
	I have noticed that they have occasional plans for power amps but
	I have no references.
>
>It would also be interesting to see, apart from the amplifier circuit
>design, to what lengths designers have gone to obtain power supply noise
>rejection and decoupling, for example, electrochemical cells as power supply
>shunt filters, solid bars or copper braid as low-inductance supply conductors,
>and the like.  Ditto for quiet cooling and efficiency, e. g. heat pipes,
>plumbing, switchable supply levels, or other wierd stuff.
>
	A PS audio amp I saw (forgot the model 1A?, cost ~1500) was built
	around a massive copper ground plane.  This thing was really
	a copper bar, connected to the filter caps (and elsewhere I could
	not see).  It seemed to be about a half inch thick and undoubtedly
	weighed several pounds.  It was polished and appeared to be 
	very pure.  Not much resistance (or gound loops), I'd bet.

Jeff C.
chan@bartleby.berkeley.edu
ucbvax!bartleby!chan