On Thu, 25 Jan 2007 16:50:46 -0500, "Mark Amos" <[EMAIL PROTECTED]> wrote:
>This has led me to a silly quest. I'd like to use a traditional clock face >and hands as an output device for a >1PPS signal from my GPSDO. > >I know this is a very broad question, but does anyone have advice on where I >might start hacking (or making) a >mechanical clock face to accomplish this? Is there a simple clock design that >I could start with to build my own? >Maybe replacing a pendulum or escapement with a solenoid? Any examples to >work from? Finally something I can contribute. Any el-cheapo quartz clock movement should work with a little mod. I've disassembled several brands and they all appear to be the same on the inside. A chip-on-board does the logic and a 2 coil stepping motor drives the second hand. The minute and hour hands are driven through conventional geartrains. The stepper has two coils and the rotor turns 90 deg with each step. All you need is a little logic to take the one PPS and turn it into stepper commands. Anything from a PLA to a PIC should do. If you didn't want to mod the clock you could build a 32khz oscillator phase locked to the one PPS signal and feed this in place of the tuning fork crystal. Hard to say which would be simpler but probably modding the clock to drive the stepper directly. John --- John De Armond See my website for my current email address http://www.neon-john.com Cleveland, Occupied TN Don't let your schooling interfere with your education-Mark Twain _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
