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Need Help: 12V Timed delayed Auto on/off switch

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  • Need Help: 12V Timed delayed Auto on/off switch

    Hello, i need some help. Sometimes when i turn my car pc on the screen turns on faster than the PC and the screen stays in standby because it doesnt since video signal.

    The M2-ATX power supply has a user adjustable time delayed on off switch that starts counting once a 12v ignition signal is recieved. This is what i want to have happen when i turn on the PC. I want to delay power for the screen for approximately 3 sec since it just turns on when i gets power and hopefully it will stop staying in standby. Any help here is always greatly appretiated.

  • #2
    Use the 12V from your m2-atx to power or turn on the screen. If you can't spare current from your 12V line, use it instead to tigger a relay which supplies 12v from the car.

    What screen doesn't have auto sense?
    System always under construction


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    • #3
      it does have autosince but for some reason does this. I built a little box consisting of a relay and some switchs to give power to the computer. Basically i have momentary push button to start the relay and the relay stays closed after you relaease the button but only opens when you shut off the car. I wish to inside this box a smal circuit that basically does what i described and also rectifies the current to 12v.

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      • #4
        USB has quite a long delay. You could add a 5V relay off USB to trigger your latch. It might be half way into the boot, but would do the trick.

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        • #5
          i guess that culd work but still i just wanna build something inline

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          • #6
            Originally posted by Curiosity View Post
            USB has quite a long delay. You could add a 5V relay off USB to trigger your latch. It might be half way into the boot, but would do the trick.
            Alot of motherboards will power on usb for a second or two as part of a self test when the system first boots and then cut power till the OS gains control. Better off just using the 12 or 5v line of the PSU.
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            • #7
              That's true. It will power up to check for bootable devices, but can be disabled. I also sell timers for this kind of thing. The M2-ATX should work for the supply though. Why aren't you using that? Search ebay for AX3022 and you'll see what I'm using for mine right now. It has a very clean output and it's cheap. I have it set for 12.1V and it has never cut out and always stays cool.

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              • #8
                do you know of anything i can build myself?

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                • #9
                  Sure. There are lots of on delay circuits. 4th one down here http://www.bowdenshobbycircuits.info/page2.htm
                  That was from an off delay thread a few days ago. I forget what it was for.

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                  • #10
                    cool, ty so much for your help. ill check it out. Thats what im looking for.

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