I like electromechanical pendulum clocks, ( masterclocks FAVAG & Bürk ) which I use at home and have a 24 Volts 1 minute alternating polarity system set up which drives about 30 slaves in my house. [Linked Image] accuracy is within ± 6 seconds / month. For the seconds I use a tacho generator which does 1 minute in 58.66 seconds, to keep them in step with the master.

As accurate reference clock I use an 4,194,304 Hz crystal oscillator, 22 divider to provide a very accurate time reference of 1 second, (drift less than 2 secs a month). A stable temperature of the crystal is helpful and a good quality trimming capacitor / reference cap.

I'm still working on an automatic synchronising system which opts for the highest accuracy, OK I admit my hobby is a little out of control and there are not always enough hours in a day to get it all sorted out yet, but I prefer brass gears instead of plastic fantastic.

The product of rotation, excitation and flux produces electricty.