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From: John Popelish
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X-Mailer: Mozilla 4.7 [en] (Win98; U)
Subject: Re: 100Hz from 25.6kHz crystal.
Date: Tue, 03 Dec 2002 16:23:16 GMT
NNTP-Posting-Date: Tue, 03 Dec 2002 11:23:16 EST
Peter Nolan wrote:
> I just got some 25.6kHz crystals from www.digikey.com I want to get 100Hz
> from the O7 output of a 4060 14 stage ripple-carry counter/divider and
> oscillator. I am trying to use the Pierce oscillator( I wish I knew more
> about the Pierce oscillator than I do which is close to zip) that is drawn
> in the Philips datasheet at:
> From here one can download the datasheet. It downloads in seconds.
> In spite of my best efforts I cannot coax the oscillator to oscillate at
> 25.6kHz. Instead it oscillates at around 422kHz. I have tried varying Rbias
> and C3 over the recommended ranges but to no avail.
> The datasheet for the crystal(C-2 type) is at:
Try raising the value of R2 to lower the loop gain.
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