In order to form a protracted period timer the 556 IC teamed
up with a binary divider will give delays the maximum amount as sixteen times
that set by the time constant of the primary timer. You'll be able to use 2 555
ICs rather than the 556.
The first timer provides a delay of seven. 5 minutes and
therefore the divided outputs provide a delay of fifteen min, 30 min, one hour
and a pair of hours severally. The second timer is employed to get the required
output pulse length. extra dividers is also added to relinquish longer delays.
If you would like an extended period, for up to ten hours
you'll be able to use this circuit
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| New Long period Timer |
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