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Question momentary time delay switchs ( bit-tech.net Forums Modding )
Updated: 2008-03-15 18:48:38 (3)
momentary time delay switchs

Hey all, i was wondering do they make momentary switchs with a time delay.
What i mean by that is do they make a switch that when pushed will close the circut, but it will stay closed for a couple of seconds before it opens again.
I have tried searching google using every combination of words, i just want to check here before giving up.

Thanks
isho.

Answers: momentary time delay switchs ( bit-tech.net Forums Modding )
momentary time delay switchs

The google word is 'monostable' and most links will cover the 555. This one was the first good one listed and is the simplest circuit. A minor snag is that if you keep the button pressed the timer stays on.

This one adds an extra couple of bits to give a fixed on time even if you sit on the button and shows how to add a transistor switch to boost the current rating. On Time = 1.1 x R1 x C1 (1.1 secs with 1M & 1uF)


cpemma

momentary time delay switchs

You will most likely have to use a chip such as a 555 IC timer wired in single-shot mode to take the pulse you send from the momentary switch and extend its duration.

A very good resource is this website

Xiachunyi

momentary time delay switchs

That would be an entire circuit. I think there have been posts about such a device.

hydro_electric_655

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