Thanks Bojan - I will look into uPs as I really only want one clock frequency. I think it is of the order of a couple of hundred hz but I can measure this as I have a frequency counter.
Could you direct me to a suitable circuit using available components? I see that JayCar has a range of uPs but a search of their data sheets and the net made me none the wiser on how to go about this task.
Cheers Peter
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