Re: RCA Clock radio wierd problem - Help!

From: Franc Zabkar (fzabkar_at_optussnet.com.au)
Date: 08/19/04 

Date: Fri, 20 Aug 2004 07:03:40 +1000

On Thu, 19 Aug 2004 17:28:00 GMT, Bill Jeffrey
<wjeffrey@TAKE-THIS-OUTalum.mit.edu> put finger to keyboard and
composed:

>Sam Goldwasser wrote:

>> But, didn't he say he thought there was a crystal in the RCA?
>
>Yes, he did. I assume that the crystal oscillator is there simply to
>take over in the event of power failure. For "normal" operation, the
>power line frequency (or at least aggregate number of cycles over 24
>hours) is much more accurate than any cheap crystal oscillator.

I suspect the crystal also provides the clocking for the uP (?) and
LCD. AFAIK, a uP can't get much work done at 50 or 60Hz :-)

- Franc Zabkar 

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