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Thread: power carPC from bench..i read the wiki but a little confused..

  1. #1
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    power carPC from bench..i read the wiki but a little confused..

    Hi Guys,
    i read the article on altering a standard atx power supply to work with your car pc on bench... arg! twas a little confusing...

    this is one a guy on here has done but based on the article and the pic i still can't figure out clearly how to do it...
    on the image on the wiki it shows the hdd connector going to the 12v dc dc supply (in green) is that green block your atx supply??

    does anyone have a picture by picture explanation of how to do the job or some more detailed (ie closeup pics) of one of their on desk supplies?

    thanks for your help,
    - tom

  2. #2
    Fusion Brain Creator 2k1Toaster's Avatar
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    I can get some pics if you like, but here is a more detailed description:

    In order to power a DC-DC PSU it needs 12v so you take the yellow wires from the desk PSU and connect to IGN and +12v const. (On the M2 that would be the red and white). THen the ground is black on the molex and black on the m2.

    Now to turn on the desk PSU to supply 12v, you need to take wire #14 from the ATX connection on the desk PSU (The ATX connector is the 20 pin big connector that goes to the mobo) and short that out with a ground. #14 is a green wire. Just short it, and on the beast will come. Pretty simple.
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    It ain't easy being a green moderator meddler's Avatar
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    no. the green block is you DC-DC power supply. The connector you see in the pic connects to a HDD drive power connector from your ATX PSU.

    I will try to update the wiki to make it less confusing later on this evening.
    Never let the truth get in the way of a good story

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    thanks so much for the explanation!!
    i need to rig it like the one above because im using an opus 120w from the inbuilt case to the plug like inthe pic above... by short it what do you mean?

    also do you need an on off switch like it says on the wiki?

  5. #5
    Fusion Brain Creator 2k1Toaster's Avatar
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    Well the opus has a +12v constant, +12v ignition, and a ground wire just like the M2. So lets call the +12v constant "RED", +12v ignition "WHITE", and ground "BLACK" just for explanation purposed. They could be polkadotted for all I care.

    So the yellow from the desktop psu goes to both the RED and WHITE wires on the opus. the black from the desktop psu goes to the BLACK wire on the opus.

    Now here is an ATX connector:


    Pin number 14 is "PS_ON#". This carries a small current. You need to ground this wire (i.e. short it out) for the PSU to come on. This wire must be shorted the entire time that you want the power supply on. Want to turn off the power supply, disconnect whatever you used to short out pin #14.



    If you want an on/off switch it is basically a way to pretend as if you are disconnecting and reconnecting the object shorting out pin #14 without actually doing anything but flipping a switch. So if you can live with shoving a paper clip in ther eand pulling it out when you are done then no you dont.
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    30 Digital Outputs -- Directly drive a relay
    15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
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    awesome!
    thank you for the detailed explanation! that makes alot more sense! thank you for relating it to the opus! verry much appreciated! i'll give it a go and hopefully won't fry my opus psu!

  7. #7
    Fusion Brain Creator 2k1Toaster's Avatar
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    no problem
    Fusion Brain Version 6 Released!
    1.9in x 2.9in -- 47mm x 73mm
    30 Digital Outputs -- Directly drive a relay
    15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
    Buy now in the MP3Car.com Store

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