I believe it's a better approach too. It seems you have much finer control tuning that "heartbeat" signal compared to a ceramic trimmer capacitor in the oscillator circuit. I'm experiencing 'drift' of less than 1 second/month and it seems my quarterly adjustments now are just chasing temperature drift and crystal aging.bobledoux said:Its been an interesting project. I've been impressed with the consistency of a regular microprocessor crystal at room temperature. In my first controller I unsuccessfully tried to vary the crystal frequency by using a variable capacitor in the crystal line. I've since decided that changing the delay period in software is a better approach.
Just added a new slave to my masterclock system.
This is built in the style of a regulator and uses 3 modified quartz clock movements to display hours mins and seconds in a 12" office dial clock case.
I found my master clock could only drive 3 clock motors using the 4093b chip. I was already driving 2 slaves from this output and as this new clock had 3 seperate clock motors I have now added a "repeater". The repeater sits inside one of my clocks and can drive upto 6 clock motors.
Full details here Electronic Master Clock
PS I have added a short animation showing the master driving an analogue and binary slave and electro mechanical chiming to You Tube YouTube - masterclockmovie.mpeg