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From: francis@cs.ua.oz.au (Francis Vaughan)
Newsgroups: sci.electronics
Subject: Re: Simple RIAA phono filter
Message-ID: <1857@sirius.ucs.adelaide.edu.au>
Date: 16 Nov 90 01:11:08 GMT
References: <90311.114631MKUHN@auvm.auvm.edu> <11200@milton.u.washington.edu>
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|> In article <90311.114631MKUHN@auvm.auvm.edu> MKUHN@auvm.auvm.edu
(Marty Kuhn) writes:
|> >Ok, here's the problem:
|> >   I've hooked up a (ceramic-cartridge) turntable to my boom-box's
AUX input.
|> >This works fine, execpt that records sound much 'tinnier' than they should.
|> >I would guess this is due to the RIAA equalization curve that records are
|> >cut with.  What I want is a simple filter to de-equalize the signal
to match
|> >a standard AUX-type input.  This should preferably be a simple R-C passive
|> >filter, so that I don't have to build a separate power supply 
|> 

Umm, No. Most crystal/ceramic cartriges are built with a natural RIAA curve
in them. Of course it will probably be a pretty lousy match to the legit
curve, and you may have other problems. Might be worth looking at
impeadances. Maybe  put 10k across the input and see what happens.
If your boom box has an attempt at a graphic equaliser you
can play with that.

						Francis Vaughan.