Re: mini mosfet audio amp design

On Wed, 26 Mar 2008 01:12:11 +0000, Eeyore wrote:



Rich Grise wrote:

On Fri, 21 Mar 2008 22:02:34 +0000, Eeyore wrote:
mrdarrett@xxxxxxxxx wrote:
Eeyore wrote:
mrdarr...@xxxxxxxxx wrote:
Since it's still too early or Fourth of July fireworks shows, can you
(or anyone) recommend a link to a low-parts-count, 20W or so into 8-
ohms audio amplifier? Input will be from a laptop or MP3 player, so
no preamp necessary.

Build one around one of the National semiconductor 'symphony' or is it
'overture' series of IC power amps. They're quite good. I dare say there's an
app note that explains it all, or Google for 'gainclone' which was an amp
based on these chips favoured by the hi-fi fraternity. It performs rather
well.

Of course you don't get to find about the mysteries of designing with
discretes this way by copying all the bad practice shown by the poster of the
circuit you referenced.

So are you saying the Gainclone is as good as, or better than,
discretes?

It's better than many discrete designs for sure but not as good as some really
excellent ones.

(Not putting you on the spot. Not at all. 8-)

Are these circuits any better, then?

http://www.redcircuits.com/Page2.htm

That's more like it.

http://www.redcircuits.com/Page100.htm

That looks fairly OK too.

Or should I just give up on that site...?

It seems to have redeemed itslf now.

I notice that all three have a "crossover" pot, but it's kind of
a set-it-and-forget-it adjustment.

Either is WAY WAY better than that first one. Like John said,
if the biasing was designed right, then R3 could be a fixed R,
and R4 could be a much lower value pot in series with a fixed
R, to make it less ridiculously touchy.

Agreed.

Welcome back again btw.

Oh, I've been around, just doing more reading than posting. I've
given up on the politics crap, it seems you always get these
long boring pissfests, with the neocons being neocons and the
socialists being socialists, ho hum.

Of course, being a Libertarian, both types of extremists hate me. ;-)

Cheers!
Rich


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Relevant Pages

  • Re: mini mosfet audio amp design
    ... Of course you don't get to find about the mysteries of designing with ... discretes this way by copying all the bad practice shown by the poster of the ... circuit you referenced. ... So are you saying the Gainclone is as good as, or better than, ...
    (sci.electronics.design)
  • Re: mini mosfet audio amp design
    ... Of course you don't get to find about the mysteries of designing with ... discretes this way by copying all the bad practice shown by the poster of the ... circuit you referenced. ... So are you saying the Gainclone is as good as, or better than, ...
    (sci.electronics.design)