Cycle Test

Cool! It's always a pleasure to hear success stores on these design things. :-)

Hoow close do you have to be to 3 minutes? Simplest thing would be to run 60 Hertz through a 14 bit binary counter, which would get you in the ballpark. Or, use one of the CMOS counters that include an RC oscillator, and get it to within a couple of %. Either way you can use a logic level N channel FET to operate the relay, if you need it.

Tam

Thanks, for the suggestions...

I built one real quick last night. I ran a ULN2808 darlington off the parallel port, enabled the freewheeling diode, then ran the output to a relay. I have a timer in a dephi program toggling a bit. Oh, 1 hour fix and a couple cups of coffee and she was working. about 90 cycles so far, since I powered it up.

Power On. Power Off. - Just like the movie, uhmm, think it was Wax On, Wax off.

Richard

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richard,

if you use pic stuff already and ahve a programmer etc. do it like that then when you need a more complex test you can build on it easily..

PIC, (run it RC ) resonator / Xtal + 2 ceramic caps. (if not RC) Transistor. two resistors. regulator or zener to run pic from same 24V supply.

have fun.

Andrew

out

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