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From: alab@ur-tut.UUCP (Daniel F. Luna)
Newsgroups: sci.electronics
Subject: Re: need advice on TV sound amplifier
Message-ID: <1288@ur-tut.UUCP>
Date: Fri, 8-May-87 05:34:42 EDT
Article-I.D.: ur-tut.1288
Posted: Fri May  8 05:34:42 1987
Date-Received: Sat, 9-May-87 18:47:40 EDT
References: <578@stracs.cs.strath.ac.uk> <566@neoucom.UUCP>
Reply-To: alab@tut.cc.rochester.edu.UUCP (Daniel F. Luna)
Organization: Univ. of Rochester Computing Center
Lines: 13


   Another problem that you may be experiencing is that there is a (probably)
substantial impedance mismatch between the headphone jack and the amp you are 
using.  Usually headphones are 8ohms, and input to line amps are on the order
of 10's of thousands.  Although in this direction (low to high) things work,
they are not efficient, and much power is lost.  Try adding an impedance matching
device like an 8ohm to 10K transformer in the line.

-- 
Daniel F. Luna 
PC-Person.
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