> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of Adam stambler
> Sent: Friday, December 08, 2006 11:47 AM
> To: Microcontroller discussion list - Public.
> Subject: Re: [PIC] Oscilator Problem
> 
> Sorry, my description of my problem wasn't exactly accurate.  
> I tried the circuit with my full program instead of just a 
> turn on LED test.
> 

I built a PIC project that used a crystal and found the crystal to have
flaky behavior.  Rather than futz with it I removed it and replaced it
with a canned oscillator.  But your question got me to wondering why it
didn't work.  A crystal is a cheaper solution that an oscillator.  I did
some digging and found this:

http://www.springerlink.com/index/R181295K26346647.pdf

Also this:

http://www.citizen.co.jp/english/crystal/attention/index.html

Which says to use a variable resistor in series with the crystal, and
adjust it until the crystal starts oscillating.  This tells you the
internal negative resistance of the crystal, and you can use that value
to choose values for C1, C2, and Rd

Adam, do you have access to a scope?  It sounds like you're using a
multimeter but you won't get far with it, I don't think.

--steve


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