Hi, Chris. I built up a sporting events timer some years ago, with a crystal oscillator module (3 terminals, +, gnd and Output) and five decade counters as dividers. There were also start and stop buttons, a digital display and an amplifier fed with three different tones plucked from along the divider string to signify the end of the session, into a six-inch horn speaker. But the oscillator and decade counters portion was quite simple, the dearest part being the oscillator module operating at 1 MHz, I see Farnell still have them, looks like P/n 9712402, runs on 5V as do the 4017 decade counters. The output of MY string is one pulse every tenth of a second, so you would need one more counter. Modernising that a little, I'm using a chip CD4059A in a "power your car with hydrogen" project, which can divide by 1000, so it can probably be done with fewer parts if necessary. But 4017s are cheap and still available, although oldfashioned, and I'm still using them in projects. The output of the 4017s run on 5v may not be enough for the clock motor but a simple power transistor and base resistor should interface. If you need a different voltage for your motor you may need the power supply for the output stage at one voltage and then a three-terminal regulator to 5V for the other stuff. And you may need six dividers as five will give you pulses a tenth of a second apart, you will probably want half a second or a second between them. I have located the paperwork from my old project and can give you the PC board layout I used in an email, you can just add the extra stage, if you don't want to do a PC board, Veroboard should be possible if it's still available. If you want any of this info let's know.
