I suppose that a 4700 is the minimum capacitor to use. There are .5 and 1 Farad capacitors in low voltage now available to power RTC's instead of coin batteries. Why not use one?
Take a look at http://catalog.digikey.com/scripts/p...?name=P6955-ND
Ioannis
P.S. By the way, nice instrument Luciano!
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