In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Chris Savage wrote:

Bean,

   Such a clock was in a recent issue of Nuts & Volts I believe...It used the 60hz from the AC line for it's clock base.  The part I didn't agree with was that they used the DS1302 or similar as a backup device for when poewr was lost, but maintained that the AC line was much more accurate than the DS chip.  I think it's funny the people that have the DS1302's and DS1307's that say they're inaccurate.  I have used several, and in a week they're never more a second off from the clock I set them by, so I don't see the problem with just using them.

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