timer circuit

If accuracy isn't critical (> 10% variation either way is OK), then a pair of 555 timers (or a 556 dual timer) could provide what you specified.

If timing accuracy is critical, then a simple micro like the PICAXE (under $5, programmed in BASIC) would be a better choice. For even better accuracy, you can add a crystal as the clock source and have one or two seconds per day timekeeping accuracy.

Google "555 timer".

Pilgrim wrote in news:pilgrim-3B1BFC.17302213042012@

70-3-168-216.pools.spcsdns.net:

buy two timing relays.

"Pilgrim"

** Do the above two ranges need to be independently adjustable - or is that the tolerance band ?

You need to be FAR more specific.

... Phil

Yes, they should be ind. adj. Accuracy is not important. Thanks CP

snipped-for-privacy@jecarter.us wrote in news: snipped-for-privacy@4ax.com:

for such long timing periods,use a CMOS 7555/7556.

a neat site I found;

calculates values for 555 astable timers.

--
Jim Yanik
jyanik
at
localnet
dot com