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From: "Bill Sloman"
Subject: Re: Mosfet amp desigh sought
Date: Fri, 10 Jan 2003 23:44:00 +0100
Organization: Planet Internet
References: <3FsT9.19037$oS1.email@example.com> <firstname.lastname@example.org> <25zT9.20644$jM5.email@example.com>
NNTP-Posting-Date: 10 Jan 2003 22:44:38 GMT
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"Phil Allison" wrote in message
> "Bill Sloman" wrote in message
> > "Jake" wrote in message
> > > Apologies if this is a regular query that has been answered before,
> > > but.......
> > >
> > > I'm looking for a good quality mosfet audio power amp design (~100W),
> > > PCB layouts and easy to source components preferably.
> > >
> > > Any pointers greatly appreciated.
> > 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
> evidence in favour of using Mosfets in audio amplifiers - especially for
> the home constructor.
> Using either Hitachi or Semelab ( Magnatec) lateral mosfets with
> bipolar voltage amp drive stage of very simple topology with remarkably
> 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 more
> components as well as electronic protection ccts for the output
> in case of shorts, overheating and difficult reactive loads.
Depends how picky you are about distortion. 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.
Bill Sloman, Nijmegen
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