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From: dplatt@coherent.com (Dave Platt)
Newsgroups: comp.sys.mac.hardware
Subject: Re: SID Board: UPDATE!!!
Message-ID: <55692@coherent.coherent.com>
Date: 3 May 90 18:49:46 GMT
References: <8223@rice-chex.ai.mit.edu>
Reply-To: dplatt@coherent.com (Dave Platt)
Organization: Coherent Thought Inc., Palo Alto CA
Lines: 20

In article <8223@rice-chex.ai.mit.edu> mikec@rice-chex.ai.mit.edu (Mike E. Ciholas) writes:

> Due to the very limited availability of 1.558Mhz resonators, I have been
> searching exhaustively for a replacement circuit.  Criteria are: cheap, 
> avaiable parts, and close frequency.  But how close is close enough?

How about the 1.558 MHz quartz-crystal substitution that the SID Trio
suggested in their followup note?  Drop out the resonator, drop in the
crystal, and change the value of the two resonator capacitors.  They
even provided a source or two for the crystal.

The parts cost was at the high end of the range you specify, when the
crystals are bought in 1-sies... the price might come down significantly
if you bought a few dozen at once.  The biggest advantage, I think, is
that it doesn't require any changes to the circuit topology.
-- 
Dave Platt                                             VOICE: (415) 493-8805
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