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From: John Woodgate
Subject: Re: Output Impedence
Date: Fri, 25 Oct 2002 20:16:06 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Fri, 25 Oct 2002 21:17:37 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Michael R. Kesti
wrote (in <3DB97CF0.1682A5C0@gv.net>) about 'Output Impedence', on Fri,
25 Oct 2002:
> Then load the output with
>about 1000 ohms (Rl) and again measure the output voltage (Vl). Maximum
>accuracy will occur when Vl is about half of Vo. If Vl and Vo are almost
>equal, then the value of Rl is too high and you should try again with a
>smaller value. Conversely, if Vl is small compared to Vo, try again
>using a larger value for Rl. Doubling or halving the value will quickly
>get you to an appropriate value.
>Another approach is to use a potentiometer for Rl and adjust it until
>Vl is exactly half of Vo. Rl and Ro are equal under this condition
>and May be determined by measuring the resistance across the potentiometer.
DON'T do this with the outputs for loudspeakers! You will zap the output
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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