Using inexpensive integrated circuits, a digital timer-controller can be constructed which will provide control pulses after preset times from the start of a sequence, and which is also capable of providing pulses at a constant preset rate. The basic clock rate, 1 s is derived directly from the power line frequency, with resultant high accuracy. Long time periods (over 1 h) may be timed out without significant decreases in resolution, as with analogue timers. The unit is modular in design and can be easily expanded to control several timing channels.