From: Watson 'Atto Parsec' Name
Subject: Re: audio line specifications
References: <3DEE2757.EE79B063@crf.canon.fr> <3DEE35F9.20AC0D73@gv.net> <1RvH9.email@example.com>
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Date: Thu, 5 Dec 2002 04:43:41 -0800
NNTP-Posting-Date: Thu, 05 Dec 2002 05:44:58 PST
Organization: InReach Internet
In article <1RvH9.firstname.lastname@example.org>, email@example.com
> "Michael R. Kesti" wrote in message
> > o Impedance: power transfer techniques using matched source and load
> > impedances of 600, 300, or 150 ohms used to be common and are still
> > sometimes used,
> ** Oh really? Which audio gear uses max power transfer for signal
> or load ??
> Make and model please.
I think what he means is that the line is fed by a transformer, that
matches an output stage at some impedance, say 5,000 or 10,000 ohms, to a
line that is terminated with a 600 ohm load. This is essentially a power
transfer, since the line driver stage isn't a low impedance cathode
follower or emitter follower, etc.
There's nothing that says that you can't use a pair of low impedance
emitter followers to drive a balanced load. But then you lose the
isolation of the transformer.
> ...................... Phil
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