LED clock?

Bumpyroad wrote:

GordonThree wrote:
Battery powered "atomic" clocks are just fancy quartz clocks. The WWVB receiver is only powered up occasionally, it takes too much power to leave it on all the time (compared to the micro amps for the quartz, a counter and the lcd display.) I bet even the ones that plug in only power it up on occasion.

If you need higher accuracy than a junk quartz clock here's options:

Get a clock with a TCXO - temperature compensated crystal oscillator - the quartz has a heater and operates at a stable (high) temperature. As quartz resonate frequency changes slightly with temperature, this improves accuracy... should cost under $100

Get a rubidium oscillator (an actual atomic clock) instead of quartz, very popular for high precision timing. Expect to pay a couple grand, used ones that have expired calibrations are cheaper on ebay. You'll need a separate counter to display "time" as this is just a frequency reference.

Get a GPS disciplined oscillator, based on either quartz or rubidium. Again, you'll need a separate counter to keep track of time, but it should be very very accurate.

Don't forget, your elevation will also affect the accuracy of time keeping, regardless of oscillator used. The farther out from the Earth's gravity well, the faster time passes relative to those closer in.

Ah, the OP said "Would like to get an inexpensive panel mount style of LED clock" and I don't think he wants to spend thousands of $$$ nor wants/needs that accuracy.
bumpy

oh, I meant to reply to the post above mine, regarding quartz clocks lacking accuracy.

I guess I could have replied: I don't think they make synchronous motor digital clocks anymore? (rely on power company to keep time) Past 20 years or so, regardless if a digital clock says quartz or not, it has a quartz oscillator on it.