Custom 12v Electronic sleep timer circuit needed for Headrest DVDs

[neiloakley]

Originally Posted by danieljsinclair

That's not a bad start thanks Neil, but from what I can tell, it's push on/push off. It's not triggered by the car feed. It's a good fallback, and I might just try it, but I'm looking for something slightly more automatic really.

I disagree - you give it power, then it flicks the relay for a preset time period.

Originally Posted by Maplin

Q- I'm looking for something to switch on a 12v bulb when current is applied and switch the bulb off after a few seconds with the 12v feed still being applied. Will this item do this - martin
Answer- Yes the product does support that.

Originally Posted by Maplin

Q- Will this work with a 12 v ( car ) circuit, to turn on and off after a delay a water pump? Trigger is a pressure switch to this item. - Neil
Answer- this is a +12Vdc supply item so it will work with a car.

Originally Posted by danieljsinclair

Re: your comment about the resetting - it's a good point, I hadn't thought of that, but as far as I know, our DVDs don't do that if going from Key to start is any indication. I'm pretty sure the permanent power feed is, well, permanent and reliable. The power doesn't seem to drop or spike in any significant way that affects this. I guess if it did, all kinds of things would get reset eg. Nav.

Agreed - permanent is permenant. But when you crank the engine, the voltage WILL drop all around the circuit. And if it drops below the minimum required by the DVD player, it will effectively turn off. It wont reset completeley as there is still voltage there, but it may be at 10 or 11 volts and DVD player might require a minimum of 11.8 to function properly.

Just a thought, and something worth checking before you proceed.