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From: John Woodgate
Subject: Re: 'Current Dumping' Amplifier Circuits ?
Date: Wed, 4 Dec 2002 00:07:08 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Wed, 4 Dec 2002 04:28:58 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Phil Allison
wrote (in ) about ''Current
Dumping' Amplifier Circuits ?', on Wed, 4 Dec 2002:
>** I service and test these buggers for a living, John.
I never doubted it for a moment.
> The THD figures I see are nearly always better than 0.1% at 1kHhz
>at just below clipping into 8 ohms. Some are down to 0.005 % at that level
>( Yamaha 2200)
> Go 0.5 dB more an the figure is 5% THD. Nothing crazy is there?
Well, 0.5 dB in power terms is a 12.2% increase. In heating terms, that
can easily take a voice coil over the magic 260 C that spells disaster.
And amps are often driven up to 10% THD in the field. Is your experience
of fried drivers different?
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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