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Old 03-21-2008, 06:33 AM #1
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Default Need help building (hopefuly simple) timer circuit

Okay, i need to put together a timer circuit, eg... when i put voltage *here* 45 seconds later (it doesn't have to be precise, 30-60 would be fine) it will come out *there*, only resetting the timer if power is shut off then reapplied.

So what would be the simplest way to do this? It also needs to be able to tolerate 24v.

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Old 03-21-2008, 06:39 AM #2
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Default Re: Need help building (hopefuly simple) timer cir

Have a read on the 555 timer IC, and head on over to www.electro-tech-online.com They have a few circuit diagrams and will help you with making a timer circuit, they have helped me alot! Just don't ask for a circuit diagram straight away, thats the one thing that annoys them.
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Old 03-21-2008, 06:48 AM #3
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Default Re: Need help building (hopefuly simple) timer cir

That would be perfect but it seems like it only tolerates 18v max.


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Old 03-21-2008, 07:00 AM #4
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Default Re: Need help building (hopefuly simple) timer cir

Use a relay to switch the voltage.
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Old 03-21-2008, 07:13 AM #5
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Default Re: Need help building (hopefuly simple) timer cir

Perfect, time to get reading and see if i can build this [smiley=vrolijk_26.gif]


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Old 03-21-2008, 12:08 PM #6
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Default Re: Need help building (hopefuly simple) timer cir

It shouldnt be to hard, there are heaps of 555 timer circuits out there. Nothing is SMD unless you want it to be.
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