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From: "Phil Allison"
References: <3FsT9.19037$oS1.email@example.com> <firstname.lastname@example.org> <25zT9.20644$jM5.email@example.com>
Subject: Re: Mosfet amp desigh sought
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Sat, 11 Jan 2003 13:25:25 +1100
NNTP-Posting-Date: Sat, 11 Jan 2003 13:14:59 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Bill Sloman" wrote in message
> "Phil Allison" wrote in message
> > >
> > > The mosfets might not be a good idea.
> > >
> > > http://www.dself.demon.co.uk/dipa.htm
> > >
> > > Douglas Self knows what he is doing.
> > ** Maybe he does. However that does not outweigh the enormous amount
> of evidence in favour of using Mosfets in audio amplifiers - especially
> > the home constructor.
> > Using either Hitachi or Semelab ( Magnatec) lateral mosfets with
> > bipolar voltage amp drive stage of very simple topology with remarkably
> few> parts one can easily produce a power stage with first class audio
> > performance which is also very rugged and reliable.
> > To get similar performance from BJTs requires the use of many
> > components as well as electronic protection ccts for the output
> transistors > in case of shorts, overheating and difficult reactive loads.
> Depends how picky you are about distortion.
** Is well below audibility good enough ?
I'd go for MOSFETs myself, but I
> wouldn't be aiming for Doug Self levels of distortion, and the poster was
> asking for a good quality audio power amplifier.
** Even simple topology mosfet amps are easily capable of 0.01% THD with
NO crossover artifacts.
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