Hi! I have a perhaps silly question. I want to take an inferior medium (our eyes) and give it something attractively precise to look at. Is there such a thing as a digital (wall) clock with a 1PPS/10MHz/etc. input? I see that some clocks have GPS antenna inputs, but I want to take a GPSDO and hook it up to a digital clock. Purely for fun, as a mini project for myself while I build my bigger clocks. Maybe one day I'll make this work with a grandfather clock. Thanks, Eamonn

Hi, I had same question several years ago. You're gonna have to roll your own. Look here <https://hassam794.weebly.com/digital-clock-using-4026-ic.html> On Tue, 2 Mar 2021 17:38:24 -0500, Eamonn Nugent wrote: >Hi! >I have a perhaps silly question. I want to take an inferior medium (our >eyes) and give it something attractively precise to look at. Is there such >a thing as a digital (wall) clock with a 1PPS/10MHz/etc. input? I see that >some clocks have GPS antenna inputs, but I want to take a GPSDO and hook it >up to a digital clock. Purely for fun, as a mini project for myself while I >build my bigger clocks. >Maybe one day I'll make this work with a grandfather clock. >Thanks, >Eamonn >_______________________________________________ >time-nuts mailing list -- time-nuts@lists.febo.com >To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >and follow the instructions there. Bill Beam NL7F

If you can open it up and get at and identify the crystal, you can synthesize its ideal frequency from a GPSDO output, then run it in there in place of the crystal. Ed

On 3/2/21 4:32 PM, ed breya wrote: > If you can open it up and get at and identify the crystal, you can > synthesize its ideal frequency from a GPSDO output, then run it in > there in place of the crystal. I did this for a 24hr Mars clock using a 3325 to generate 31947.2745 Hz

Eamonn, Here are a couple of ideas for you: 1) You may find some GPS / NTP / 1PPS / 10 MHz precise time friendly professional clocks at: https://www.masterclock.com/ 2) If you have a 50/60 Hz mains wall clock you can always use this trick: http://leapsecond.com/pages/atomic-nixie/ 3) You can convert your perfect 10 MHz into perfect 32.768 Hz and inject that into any cheap 32 kHz tuning fork clock. Sometimes it's as simple as one wire. Watch one for one problem: some newer 32 kHz clocks use cycle slipping in which case feeding in exactly 32768 Hz will result in a very slight loss of time as far as the hands show. A $1 solution to converting 10 MHz to 32 kHz is: http://leapsecond.com/pic/src/pd30.asm http://leapsecond.com/pic/picdiv.htm 4) You can convert your perfect GPS/1PPS into the bipolar stepper signals used by the Lavet motor in almost all analog wrist / desk / wall clocks: https://en.wikipedia.org/wiki/Lavet-type_stepping_motor http://leapsecond.com/pages/32kHz/ 5) If you want sidereal time, another $1 PIC solution, see PD28 and PD29 at: http://leapsecond.com/pic/src/ This technique can be adapted to a wide range of frequencies. 6) Projects to hack / adapt display clocks to Rb or Cs or GPS/GPSDO timing sources is not uncommon on sites like Hackaday.com so have a look there as well. /tvb On 3/2/2021 2:38 PM, Eamonn Nugent wrote: > Hi! > > I have a perhaps silly question. I want to take an inferior medium (our > eyes) and give it something attractively precise to look at. Is there such > a thing as a digital (wall) clock with a 1PPS/10MHz/etc. input? I see that > some clocks have GPS antenna inputs, but I want to take a GPSDO and hook it > up to a digital clock. Purely for fun, as a mini project for myself while I > build my bigger clocks. > > Maybe one day I'll make this work with a grandfather clock. > > Thanks, > > Eamonn > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. >

Here are a few online projects for GPS-controlled clocks. Most (all?) have a PIC or Arduino to run the clock and sync to GPS time. [ http://w8bh.net/avr/clock2.pdf | http://w8bh.net/avr/clock2.pdf ] https://www.elprocus.com/how-to-build-a-gps-clock-using-arduino/ https://learn.adafruit.com/arduino-clock https://www.tindie.com/products/nsayer/gps-clock/ https://mitxela.com/shop/clock https://www.sparkfun.com/tutorials/47 DIY projects are easy to find with Google: The search string I used was: gps digital clock kit OR diy OR build There are a number of clocks with Nixie tube displays also; just add "nixie" to the Google search string. Good luck Dave M From: "Eamonn Nugent" <elg.nugent@gmail.com> To: time-nuts@lists.febo.com Sent: Tuesday, March 2, 2021 4:38:24 PM Subject: [time-nuts] World's most precise.... wall clock Hi! I have a perhaps silly question. I want to take an inferior medium (our eyes) and give it something attractively precise to look at. Is there such a thing as a digital (wall) clock with a 1PPS/10MHz/etc. input? I see that some clocks have GPS antenna inputs, but I want to take a GPSDO and hook it up to a digital clock. Purely for fun, as a mini project for myself while I build my bigger clocks. Maybe one day I'll make this work with a grandfather clock. Thanks, Eamonn _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.

On 02/03/2021 22:38, Eamonn Nugent wrote: > Hi! > > I have a perhaps silly question. I want to take an inferior medium (our > eyes) and give it something attractively precise to look at. Is there such > a thing as a digital (wall) clock with a 1PPS/10MHz/etc. input? I see that > some clocks have GPS antenna inputs, but I want to take a GPSDO and hook it > up to a digital clock. Purely for fun, as a mini project for myself while I > build my bigger clocks. > > Maybe one day I'll make this work with a grandfather clock. > > Thanks, > > Eamonn Eamonn, I built my own with a Raspberry Pi. As it's display-based you can make it look just as you wish. https://www.satsignal.eu/raspberry-pi/DigitalClock.html Mine takes 1pps/NMEA deom a GPS. David -- SatSignal Software - Quality software for you Web: https://www.satsignal.eu Email: david-taylor@blueyonder.co.uk Twitter: @gm8arv