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Electronics help! Need to make an auto switch delay (for a small bartop project)

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Bender:

I'm working on a little arcade project as a Christmas gift and I'm using an portable DVD player as the screen, but it doesn't automatically switch to the line in, I have to hit a button a few seconds after it turns on to get it to switch. I want to make it so that it will do it automatically, anybody know how to do it?



Bender:

anyone?

mountain:

These will give you either a timed off or a timed on, and they are adjustable. So you could get 2 of them and make it work. The first one would set the delay you need, triggering the second one. The second one would be needed to simulate a momentary button press. I am assuming this is what you are trying to do. I have seen them as cheap as $10 before.

Also, I work with some electrical engineers, I can ask them how easy it would be to design a circuit.

Beley:

You are looking for a "delayed one shot" circuit

check out:
http://www.bowdenshobbycircuits.info/page9.htm

and scroll down to "Generating a Delayed Pulse Using The 555 Timer"

...or you could just buy a "time delay relay" however the ones with at function are usally ~$100

mountain:


--- Quote from: Beley on November 23, 2009, 08:44:09 pm ---You are looking for a "delayed one shot" circuit

check out:
http://www.bowdenshobbycircuits.info/page9.htm

and scroll down to "Generating a Delayed Pulse Using The 555 Timer"

...or you could just buy a "time delay relay" however the ones with at function are usally ~$100

--- End quote ---

Nice! Great job Beley. Very interesting projects on that page.

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