As shown using a cheap CD4060 and 32768Hz crystal to produce highly accurate output 60 pulses per second clock source. The principle is 32768Hz pulse after CD4060 divider output
15,1,2,3 foot 2Hz, 4Hz, after 8Hz, 32Hz pulse input from the VDl, VD2, VD3, R2 consisting of the OR gate, every point A l / 2 sec in 1/32 seconds low, the output of block 13 feet 64Hz signal 2 pulses per second, so you can remove 4 from the 13-pin output 64Hz pulse at point B form irregular 60Hz when the group. C3 is for eliminating the 13 foot point A competitive adventure produced minimal pulse. If no C3, B outputs will remain 60Hz.