Re: Looping Binary Counter, Stable 32768 oscillator

There is a difference between stability and accuracy

The best way to get what you want is to use a GPS receiver with a 1PPS
output

See http://www.gmat.unsw.edu.au/snap/publications/mumford_2003a.pdf for a
review of several GPS receivers each less than $200

Dan

--

Dan Hollands
1120 S Creek Dr
Webster NY 14580
585-872-2606
QuickScore@xxxxxxxxxxxxx
www.QuickScoreRace.com


"GMV" <gmvoeth@xxxxxxxxx> wrote in message
news:e664$42ea52e8$4fea0a0$5983@xxxxxxxxxxxxxxxx
>I am in need of a circuit that will place minute mark
> ,second 59 or second zero of UTC, into my homebuilt circuit
> for calibration purposes. I have thought of possibly building
> a 32768Hz oscillator and using a looping binary counter that can be
> calibrated using WWV or WWVB but this all sounds silly to me
> since there must be calibration clocks already out there.
> I need either one with a TTL output or even better an FET switch or
> something
> like that with a mark I can feed directly into the back end of my
> circuit just before the signal hits the A/D converter.
> The stability of the oscillator would be most important
> not to deviate more than +/-0.03 Hz.
> My laptop has a RTC that looses one second of time every four point five
> hours
> so it is completely unsuitable for anything other than getting the time
> close enough to understand what the calibration mark means.
>
> Could someone who is an engineer provide me with
> a schematic to do this ?
> The basic idea seems simple for those educated in the EE field.
> It is the stable oscillator that eludes me.
>
> Any help here is appreciated.
> Sincerely;
> gmvoeth@xxxxxxxxx
>
>


.

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