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Analog way to delay closing a circuit?

David Shamblin wrote 07/14/2015 at 02:59 • 2 points

I have a button that when it is pressed will activate a video. When it is released, it closes another circuit which "stops" the video (actually switches to a blank video). I want this stop to be delayed so that if there is a quick, non-committed lift up on the button, it won't switch immediately. Is it possible to do with a RC circuit?

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espitall wrote 07/14/2015 at 08:46

You can use just a resistor and a capacitor (schematic: http://www.espitallier.fr/vrac/Ex1.png). When the switch is pushed, the output signal goes immediately to 0V. When released, the RC filter will delay the signal.

edit: I put the schematic in png format

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David Shamblin wrote 07/14/2015 at 13:49

This is exactly what I was looking for. Thanks so much.

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Hacker404 wrote 07/14/2015 at 05:57

Perfect job for a 555 IC (or 556). Can also be done with a capacitor, couple of resistors and a transistor.

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Eric Hertz wrote 07/14/2015 at 05:54

Sounds doable... maybe a 555. Not sure how you're going to detect a "quick, non-committed" button-release vs... what's the alternative?

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David Shamblin wrote 07/14/2015 at 13:49

Thanks for your suggestion. The project I'm doing this for is the cause and effect device on my page. The large switch plate button that I'm using has a micro switch. The idea is that the video will play for the kid if he holds the button down and will stop if he lifts it up. But I don't want it to turn off if he is just shifting his weight or whatever and lifts up on the button briefly.

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Analog way to delay closing a circuit?

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