pc wrote:
Why bother with varicaps and pots when a DS3231 chip will probably do what you want straight out of the box? Or are you thinking that you might have to trim out a constant frequency offset?
Unfortunately these aren't available from my regular supplier. From Farnell, Unit Price: £9.49, then add a not insignificant delivery charge. I might try to blag a free sample as Maxim are quite good for that. From first look at datasheet: I'm not familiar with i2c so something else to learn although won't be wasted. Claimed accuracy is 120 sec per year and at moment I seem to have about 10ms per day = 3 sec per year without compensation. I think applying some correction from a GPS when available would be trivial for someone more familiar with programing these things. At moment I have zener or LED to use as varicap, 10t pot, smoothing capacitor and regulated supply all handy. My beer brewing temp controller gives better than +/- 0.5C control so intend giving that route a shot first. David _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
