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From: John Woodgate
Subject: Re: Output Impedence
Date: Mon, 28 Oct 2002 11:26:02 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Mon, 28 Oct 2002 12:50:29 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that carltons
wrote (in ) about 'Output Impedence', on Mon, 28 Oct 2002:
>Many times, these 600 ohm lines aren't even 600 ohms. They just say that
>so that the voltage levels are defined. I would measure the mixer input
>if I needed to know for sure. You can still drive the line with a low
>impedance as long as you aren't sharing the input with some thing else and
>you have sufficient voltage. It could be you have more than enough
>voltage and require some attenuation. Check out all of this.
>If your problem is hum, a transformer may or may not help. Is you hum
>definitely coming from the source or is it due to different grounds
>between the mixer and the source? If it's the source and a difference in
>grounds, convert the source signal from single ended and go differential
>into the mixer. If the mixer line is a real 600 ohm audio line then it
>will be differential and balanced.
That is full of half-truths and could be very misleading. I don't want
to go through it bit by bit, explaining all the problems with it.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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