Timer controlled power and ground

Hello,

I'm trying to figure out how to wire or create a circuit with an on/off switch and a adjustable timer that will kill power once activated.

Anyone give me any idea ? thank you. OT

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dougw over 4 years ago in reply to o.thornwall +3

Sorry, I didn't see any specs about the application, user interface, time period, accuracy, voltage or cost, so I was just guessing at what might be suitable.
jw0752 over 4 years ago +1

Hi, Do you mean that you want to trigger the switch but then have the unit continue working for a predetermined time before it shuts off? John
dougw over 4 years ago in reply to o.thornwall +1

This function can be implemented with a time-delay-relay. There are many on the market such as this one, which cost less than $1: Or you can search for "time delay relay circuit" for a bunch of circuits…

jw0752 over 4 years ago

Hi,

Do you mean that you want to trigger the switch but then have the unit continue working for a predetermined time before it shuts off?

John
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o.thornwall over 4 years ago in reply to jw0752

Yes. I was thinking of triggering a timer ( I think) that after a preset and adjustable timer ran, it would then open the ground side to the device.
Wouid this require a microprocessor ? I would also need an LED to signal the timer was not running an another to signal the timer was running.

Are there any currant product designs that may do the same thing, that you can think of ?

Sound like an easy design ?
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dougw over 4 years ago in reply to o.thornwall

This function can be implemented with a time-delay-relay.
There are many on the market such as this one, which cost less than $1:
Or you can search for "time delay relay circuit" for a bunch of circuits you can build.....
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o.thornwall over 4 years ago in reply to dougw

Douglas, A couple of issues with this choice.
1. The timer is a potentiamter for timer.
Adjustability is not right. It only gives a limited few seconds of change for many turns. And it's a guess at what the result time will be.
I'm looking more for preset time graduation choices that can be quickly selected.
2. Once the timer has been triggered and completed, it will shut down the path to ground and need to have a reset so some kind to restart.
3. This is for a 12v circuit only. That is all that is needed.
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dougw over 4 years ago in reply to o.thornwall

Sorry, I didn't see any specs about the application, user interface, time period, accuracy, voltage or cost, so I was just guessing at what might be suitable.
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o.thornwall over 4 years ago in reply to dougw

Understandable. No problem.
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