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Is it the one that counts from 6-0? I would say that a 555 timer, in astable mode, should be okay. The accuracy depends on the components used, ie, a 20% tolerance resistor would be somewhat like the brittish bus system :shock: . What is it counting for anyway?
The 555 astable circuit can be found at pretty much any electronics site! It is a very common circuit.
i thought of something, but i don't know if it's accurate enough....
the idea is to take th 50/60Hz frequency from the mains and divide it with a 5/6 divider and a 10 divider such as 4017 or something else...
hope i helped
That could also work quite well - though the mains frequency does fluctuate about 0.1%.
Bear in mind also, that you would probably first rectify the negative half-cycle, and hence the frequency would double, to 100/120 Hz.
I'm not sure if it's of any consequence, but in areas where ripple control is used for off-peak switching, a 400-1200 Hz signal is injected into the mains, in the evening and the morning. This may or may not affect timing.