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From: "Phil Allison"
Subject: Re: Choosing the right transformer
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Sun, 19 Jan 2003 16:29:16 +1100
NNTP-Posting-Date: Sun, 19 Jan 2003 16:18:20 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Chuck Simmons" wrote in message
> Phil Allison wrote:
> > ** There are several issues - the regulator must supply the peak
> > demand though an output filter cap could reduce this figure a lot - it
> > depends on the signal - unclipped music, clipped music or even square
> The TI application note would seem to be based on nearly distortion free
> reproduction of typical music programs where peak to average ratio is
> 10:1 to 20:1.
** Where did you pluck those numbers from ? Your bum ?
This makes the 8:1 for the ratio of rated power to average
> power make sense.
** The peak to average voltage ratio is about 3:1 for highly compressed
music programme or about 1/8 power on average.
> > The heatsinks for the regulator may be OK at the 1/8 power, if
> > thermal protection is provided in case this rather artificial figure is
> > exceded.
> Yes, whatever.
** Screw you shithead.
> > The AC transformer will need to supply the peak too but the long
> > term average is way lower. If it is too small the regulation will be
> > and make your linear regulator design very difficult and lossy.
> Not really. It is a no brainer to size the capacitors needed after the
> rectifier to avoid these problems.
** Bullshit. The caps would need to be many farads if the tranny is too
You clearly know SFA about audio.
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