On Tue, Jun 28, 2011 at 11:37 AM, neutron spin <[email protected]> wrote: > Great idea...sometimes the simple designs are the most > effective....the only drawback of course for any of these crystals is > the temperature effect on the crystal and drift. We are not dealing > with NBS traceable standards here but if you a real stickler....I have > some Cesium....just kidding...the NRC would frown on > that!...regards... >
Yeah, temperature might be a bit of a problem. Hopefully the temp inside a clock is reasonably stable over time. But if the point is just to try to get accuracy close to that currently existing via the mains then maybe we don't need temperature & aging compensation. Can anybody translate these charts into a PPM error figure? http://www.leapsecond.com/pages/mains/ > On 28 June, 07:47, "H. Carl Ott" <[email protected]> wrote: >> I think you could put a 32768 xtal, a trim cap, and an 8 pin AVR (my >> preference) onto a very small pcb for about dollar or two. >> The advantage of using a micro is that could also add a simple >> calibrate function. >> >> For people who like to solder. (but don't like to code). >> >> http://www.8085projects.info/post/60Hz-signal-circuit-using-32768Hz-S... >> >> -carl > > -- -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
