Re: Looping Binary Counter to be used as a time calibration circuit

Think I just found what I was looking for

http://www.crowcroft.net/kitsrus/multimodetimer.zip

The only trouble is it has no easy way to adjust the crystal
You think they would have put a variable cap in so
you could calibrate things.


--
Until Next Time;
Geoff


"GMV" <gmvoeth@xxxxxxxxx> wrote in message news:812c3$42ea52e9$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.
> Should it be a Colpitts/Heartly/Winbridge ??? What kind ?
>
> Any help here is appreciated.
> Sincerely;
> gmvoeth@xxxxxxxxx
>
>


.

Relevant Pages

  • Re: Looping Binary Counter, Stable 32768 oscillator
    ... >,second 59 or second zero of UTC, into my homebuilt circuit ... > since there must be calibration clocks already out there. ... > like that with a mark I can feed directly into the back end of my ... MHz TTL output. ...
    (sci.electronics)
  • Looping Binary Counter to be used as a time calibration circuit
    ... I am in need of a circuit that will place minute mark ... since there must be calibration clocks already out there. ... The stability of the oscillator would be most important ...
    (sci.electronics.misc)
  • Looping Binary Counter, Stable 32768 oscillator
    ... I am in need of a circuit that will place minute mark ... since there must be calibration clocks already out there. ... The stability of the oscillator would be most important ...
    (sci.electronics)
  • Re: Looping Binary Counter, Stable 32768 oscillator
    ... >> a 32768Hz oscillator and using a looping binary counter that can be ... >> 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 ...
    (sci.electronics)
  • Re: Looping Binary Counter, Stable 32768 oscillator
    ... >,second 59 or second zero of UTC, into my homebuilt circuit ... >since there must be calibration clocks already out there. ... >like that with a mark I can feed directly into the back end of my ... clock circuit from this chip, set it to WWV time, and measured its ...
    (sci.electronics)