National Semi used to make a chip (MM5369) that was designed specifically
for that task, but it's long out of production. I don't know of any
off-the -shelf 60Hz generators, but it's pretty easy to build one.
Here are a couple of web pages that will generate a 60Hz crystal controlled
signal.
http://electronicsmaker.com/em/admin/pdf/circuit_idea/60Hz%20CRYSTAL%20CONTROLLED%20TIME%20BASE.pdf
http://www.electronicecircuits.com/electronic-circuits/50hz-60hz-frequency-generator-circuit-using-crystal-oscillator
Accuracy of the generated 60Hz will depend, of course, upon the tempco of
the crystal, the complete oscillator circuit itself, and on the accuracy to
which you adjust the oscillator's frequency.
Cheers,
Dave M
Patrick Barthelow wrote:
PIcked up a couple of large size Radio Shack 63-960 LED clocks with
Settable alarm, at local Goodwill store. $3.00 ea work great see
across room, loud Alarm, etc...
Barely missed, by seconds, getting a classic Hallicrafters General
coverage receiver
(not like say, S-38) but a larger light green metal box. nearly
perfect condx. $25.00 with the famous h logo speaker probably late
50s Vintage. :-( Dang...
Checked LED clocks by ear and eye with WWV, They drift a few seconds
in
the course of a few days, and wander back and forth. Thought AC mains
frequency was tighter than that. They use an LM 8560 Clock chip.
Uses a switchable AC mains frequency reference pin 50/60 hz.
Want to provide an accurate (relatively accurate) 60 hz reference to
the chip. Some room inside for custom modifications. Does a TCXO
or similar exist in a small package that provides 60 hz ticks?
Best, 73, Pat Barthelow AA6EG
apol <[email protected]>[email protected]
*"The most exciting phrase to hear in Science, the one that heraldsnew
discoveries, is not "Eureka, I have found it!" but:*
"That's funny..." ----Isaac Asimov
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