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Thanks moffy !!
Can you give circuit diagram if possible friend !
Are you still going on with this overly complicated pump timer?Hi Guys !
I want to make a repeating timer which can give 10minutes on and 30 minutes off...
Thanks in advance ...
Wow thats complicated.This Circuit should do what you want.
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Colin; Thats missing some values. I think thay may be explaned in the text someware?Here is a circuit:
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Not cheaply and reliably on its own (i.e. without having to drive a counter chip). It's not good for delays greater than a minute or two unless you use an expensive very low leakage timing cap.a 555 timer operated in astable mode can do this stuff.
I found this;It's not good for delays greater than a minute or two unless you use an expensive very low leakage timing cap.
That's a good question. I never made it. I dont know its origin but its all over the net. I found it in a image search and it must have been on ten sites. It may be no good, I dont know.@4pyros
Re the circuit you linked to, even at the minimum (5 min) setting it is using an 8.2 meg timing resistor. That implies an intended cap charging current of ~ 1uA. At the 30 min setting the intended current is ~ 150nA !
I refer you to
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That indicates that many of even the 'best' tantalum capacitors have typical leakage currents > 1uA at their rated voltage. However, if the leakage current at a lower voltage is greater than the intended charging current in the timing circuit then the cap simply won't charge. It makes me wonder if that circuit can actually work, or perhaps it's an 'ideal' one?
I want to use two CD4093 timing IC.