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Thread: Psu

  1. #1
    Constant Bitrate racerx3165's Avatar
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    Psu

    Ok kinda a stupid noob question, i understand that a computer operates on 12v 5v and 3v so why can you not just use the 12v strait from the car battery then get or build a 12-5v converter and a 12-3v converter? i know that smaller converters are simple to build and can pretty much be pieced together from Radio Shack for like 3-5$ I do understand that thoose are way to small to power PC components but how hard would it be to get Larger pieces and put them together. So what idea/thought am i not getting. Just so you know why im thinking so outta the box is that i am an USAF Electrician, well right now im an Electrical contigency instructor and i have attended many hundreds-thousands of hours about Electronic principals digital and microprocessing classes so im thinking maybe i can do this So how wrong am i...
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    2006 Suzuki Aerio Sx Kicker KX 650.4 RE 10

    2003 Eddie Bauer Expedition DVD - Navigation Package Traded in for 2008 XL-7 Limited

    Car PC
    Planning

  2. #2
    MySQL Error Scouse Monkey's Avatar
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  3. #3
    Maximum Bitrate Danceheaven's Avatar
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    You will never get enough current from the convertors, plus it wont withstand engine cranking
    and so much more....
    Co Develper of A.I.M.E.E Automotive Intelligent Multimedia Entertainment Engine
    www.aimee.cc

  4. #4
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by racerx3165
    so why can you not just use the 12v strait from the car battery
    Quote Originally Posted by racerx3165
    So how wrong am i...
    very!

    This is gonna sound very harsh but do they seriously let you loose on $million planes?

    Mind, you i have seen what goes on in the RAF. No wonder an aero engineers life is not so simple - he have to design for mechanics doing more damage than the enemy. Did anyone see the pictures from when a techie made a home-made pressure regulator? he didnt notice it go round once and continued to pressurise the aircraft until the thing blew up on the runway. The cargo door nearly killed somone!

    Basically it is not that simple. I wish it was.

    You need to regulate the 12V or you will fry the PC. Most regulators drop a couple of volts so you need to step up the input. Then you need to provide enough step up for crank when the voltage can drop below 9V input.

    You need to perform this step up to provide a lot of power on the 12V rail which is no easy task. You also need to have good robust circuits due to the harsh car electrical system.

    Then you need to add an SDC so you begin to realise why dc-dc solutions are not cheap.

  5. #5
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by racerx3165
    So how wrong am i...
    erm try:"about as wrong as letting Garry Glitter babysit for you while you go on holiday for 2 weeks!"

    just thought of that one! I bet Chris31 will like it - you could replace 'Garry glitter' with 'Chris31'

  6. #6
    Constant Bitrate racerx3165's Avatar
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    I mainly deal with the High Voltage side of the house from 250,000 on down. Basically i am a Lineman "well AF Lineman" http://usmilitary.about.com/od/airfo...afjob3e0x1.htm
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    1994 Mustang GT Punch 240.4 2 12" Kicker Comp SOLD :(

    2006 Suzuki Aerio Sx Kicker KX 650.4 RE 10

    2003 Eddie Bauer Expedition DVD - Navigation Package Traded in for 2008 XL-7 Limited

    Car PC
    Planning

  7. #7
    Takes it in the Rear kevinlekiller's Avatar
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    Quote Originally Posted by racerx3165
    Ok kinda a stupid noob question, i understand that a computer operates on 12v 5v and 3v so why can you not just use the 12v strait from the car battery then get or build a 12-5v converter and a 12-3v converter? i know that smaller converters are simple to build and can pretty much be pieced together from Radio Shack for like 3-5$ I do understand that thoose are way to small to power PC components but how hard would it be to get Larger pieces and put them together. So what idea/thought am i not getting. Just so you know why im thinking so outta the box is that i am an USAF Electrician, well right now im an Electrical contigency instructor and i have attended many hundreds-thousands of hours about Electronic principals digital and microprocessing classes so im thinking maybe i can do this So how wrong am i...
    The car battery is not regulated. In other words , the voltage can go up to 15 volts and down to 6 volts or more. Also there is spikes(voltages goes VERY high or low).

    To get that "12" volts to 12 volts , you need to regulate it (with a regulator).

  8. #8
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    I knew scouse will come and abuse you.

  9. #9
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by Chris31
    I knew scouse will come and abuse you.
    thats cos you pointed it out to me cos you wanted to see what i would write.

  10. #10
    Constant Bitrate racerx3165's Avatar
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    I just figured if you can make a 120V-12V PSU at 500W+ there has to be a easy way to make a 9-18V-12V DC DC PSU around 300W
    Cars
    1994 Mustang GT Punch 240.4 2 12" Kicker Comp SOLD :(

    2006 Suzuki Aerio Sx Kicker KX 650.4 RE 10

    2003 Eddie Bauer Expedition DVD - Navigation Package Traded in for 2008 XL-7 Limited

    Car PC
    Planning

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