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Thread: Mastero MK-4.5 250w 12v DC-DC ATX PSU + SDC

  1. #11
    FLAC Mastero's Avatar
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    Matrix i know this cuircut .... i have also tried it works great.

    Let me see if i can add a startup also ...

    Mastero

  2. #12
    Raw Wave rando's Avatar
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    Cool, it's always good to see you considering more features Mastero. You the man!

    BTW, if you use the ignition/ACC signal for the switched +12v lead then wont this circuit send a pulse every time the key is switch from off to on (even if the computer is already on)? Suppose you have a large shutdown delay to keep your pc running during stops at a gas station. When jump back in and restart your car, your computer is going to receive a pulse and start to shut down, isn't it?

  3. #13
    Tainted Love Cris's Avatar
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    How much heat is that PSU going to dissipate?

  4. #14
    MySQL Error MatrixPC's Avatar
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    Rando, that is true. Everytime you have the IGN/ACC line come hot the circuit send a pulse. That is why on the bottom of my previous post I stated that the (+) to the relay coil is connect to the Sproggy relay output.
    Now this got me think more that could also be wrong since the Sproggy relay won't turn on until the power button is "pushed".
    The correct place to connect to is the the relay where the output is going to the 5V standby regulator (base on MK4.0) The SDC circuit switch on the relay (STBY Relay) to put the PSU in standby mode thru a 5V regulator chip. The output of the (STBY relay) can connect to the (+) coil of this "power on" relay.
    Ok now it should work.
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  5. #15
    Raw Wave rando's Avatar
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    Oops, I didn't notice the latter part of your post. With the changes you posted, it makes sense now. Also, it seems like you might be able to ditch the relay in favor of a much smaller and cheaper switching transistor. Small, cheap, powerful and efficient ... it's going to get there!

  6. #16
    FLAC Mastero's Avatar
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    I am working on it guys its going positive...

    cheers
    Mastero

  7. #17
    FLAC Mastero's Avatar
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    I am working on it guys its going positive...

    Planning on putting a delay start up so the pc will start after the car is cranked..

    cheers
    Mastero

  8. #18
    I see dead kittens Quattro's Avatar
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    I thought your power supply survived the crank, so why do you want to delay the start of the pc.
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  9. #19
    FLAC Mastero's Avatar
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    Quote Originally Posted by Quattro-A4
    I thought your power supply survived the crank, so why do you want to delay the start of the pc.
    Imagine cold start .. early morning ..?? cranking cranking cranking ... battery is already loaded with car pc so the battery has that extra load on it ..

    I feel its better if there is a delay of 10 sec.. for those cold early morning start and those diesel cold start


    Mastero

  10. #20
    I see dead kittens Quattro's Avatar
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    I didn't think of cold starts.
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    [00000000000001100010-] 98% Completed

    Check Out My Install!!!

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