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Thread: Laptop automatic startup using a single shot relay

  1. #11
    FLAC
    Join Date
    Oct 2006
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    1,025
    what exactly is U3 on ur schematic there?

  2. #12
    Variable Bitrate
    Join Date
    Nov 2006
    Location
    Rubidoux, CA
    Posts
    241
    U3 is a simple SPST 12V relay. 12V (or there abouts) across the Coil (K) closes the contacts, which are wired across the power button on the laptop.

  3. #13
    Variable Bitrate
    Join Date
    Nov 2006
    Location
    Rubidoux, CA
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    My reasoning for continuing the pulses is that One-press starting is not entirely reliable, because of the lower battery voltages present during and about 5 seconds after cranking. This is why I have it pulse every 4 seconds, IF THE COMPUTER ISN'T on yet. I will be building the same thing for my monitor (which doesn't have an always on feature).

  4. #14
    FLAC
    Join Date
    Oct 2006
    Posts
    1,025
    thanks for the clarification.

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