I understand now why most analog wristwatches do tick every two seconds when the battery is low. I believed the logic used this trick to signal low battery.
Antonio I8IOV >Analog quartz clocks may be used as slave clocks. >You do not even have to disconnect the quartz movement. >Just find the coil on the motor and drive it with a square-wave of >0.5 hertz, >in series with a capacitor (about 50mfd) and a resistor (about 200 ohms) >Each type of clock is different, though they all are driven by >something like 1.5 V >20ms alternate polarity pulses. >The actual values are not critical but must be determined for each >type of clock. >If the capacitor resistor combination is wrong it will not work. Too >much signal >will make motors "pole" and refuse to rotate. The capacitor charges >when the >polarity changes and that current operates the clock. The resistor >sets the length >of the pulse together with the capacitor value, as well as setting >the maximum current. >Just swap values until the action is quiet, definite and reliable. >I have used this method on at least 4 different types of quartz >clock, usually from a 5 volt >logic signal. >Cheers, >Neville Michie > >_______________________________________________ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.