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From: danny@alice.UUCP
Newsgroups: net.aviation
Subject: matching to stereo headphones
Message-ID: <2039@alice.UUCP>
Date: Tue, 12-Jul-83 11:56:48 EDT
Article-I.D.: alice.2039
Posted: Tue Jul 12 11:56:48 1983
Date-Received: Wed, 13-Jul-83 20:00:56 EDT
Organization: Bell Labs, Murray Hill
Lines: 12


It was incorrectly stated on the net that if you use the center-tap
and one side of the 1000-ohm winding of an impedance matching transformer
you have an impedance of 500 ohms, close to the standard aircraft
value of 600 ohms.  Actually, the impedance ratio goes as the SQUARE
of the turns ratio, so this procedure gets you 250 ohms.  That's
probably acceptable too, but it's better to err on the high impedance
side (all you lose is a little volume), so using the full 1000-ohm
winding is probably best.

					Dan Kahn