Hi All,

I need to build a timer with a long but variable timing range, i.e. the 
timing duration can vary from, say, 1 second to 24 hours. I will use it to 
turn on/off a small water pump, which I sometime need water supply once 
every few seconds but sometime I would need water only once a day. Could 
anybody suggest such a circuit?

Thanks in advance!

John


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