Doing a little research I found a 32.768KHz surface mount crystal in the Newark
Catalog that might be used to replace the crystal in the Battery/Clock module. It
is an Epson MC306 and sells for $1.12 in the Newark catalog.
The accuracy is 20PPM, which equates to about 10 minutes/year. Since the cost is
so low, you could buy 20 or so of them, build up a gate oscillator with the same
30pf capacitors as are used in the module and use a frequency counter to pick one
with the best initial accuracy. The drift of the devices is only 3ppm which
equates to 3.5 minutes/year.
Not sure if this one fits on the module, but I'm sure there are equivalent parts
that would.
Bob Smith NY4Y
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