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repeating pulse timer help needed

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jimcreeper

New Member
I am just learning this stuff. I know I need to use a 555 timer chip most likely.

I need a circuit that will repeat a pulse once started and continue to pulse until stopped. I need to be able to adjust the time between pulses from 1sec to 15 mins. The pulse will be needed to fire an electromagnet of a sort to do small mechanical work.

Jim
 

MikeMl

Well-Known Member
Most Helpful Member
Does "starting/stopping" the circuit mean applying/removing power to it?

15min is too long for an analog timer because of capacitor leakage issues. How accurate do you want the timing period to be?
 

KMoffett

Well-Known Member
How long is the "pulse"? You might take a look at these timer circuits...particularly the Repeat Interval Timers: Timing Circuits

ken
 

jimcreeper

New Member
starting and stopping starts the pulsing.

The length between pulses could be as low as 1sec-5mins, more then 5mins would be nice.

The time length of the pulse would be about .5sec, just enoff to trick a switch.

Those circuits wont do like what I said, I have had a good look around, with no luck.

Jim
 

MikeMl

Well-Known Member
Most Helpful Member
This circuit I posted in this thread comes real close to what you need.

Is your pulse high for the short duration? If so, you would have to reconfigure the output transistor.

(Done)
 

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