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  • Power supply

    I'm new to this forum, so hello everybody!

    Anyway I want to build my own carputer too, and the only thing I can't understand is the power supply matter.
    Can't I just take a power from the cig, and connect it to the board and HD?

    Sorry for my ignorance with electricity.

  • #2
    Sure if you wanna celebrate 4th Of July early

    Search the forum there is tons of information about PSU.

    Mastero

    Comment


    • #3
      hehe, well I have looked around, and those guides getting too technical.
      And about this PSU - if I recall correctly its costs some.. I need somthing cheap, that wont make me celebrate with firewrodks, as you said

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      • #4
        Let me ask you that way:

        I have a pentium3 mother board and a chip about 1000Mhz, SB o/b and and HD. I think I will use an LCD ASCI screen, with some help of a friend.
        What are my options to supply power to that system?

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        • #5
          Not to sound like an expert, which I'm not; but you need to know that building a carputer is not as easy as you think. There are many things that you need to be aware of, and you have many options for power supply, but there are advantages and disadvantages for each of them. I think you need to take you time and read the forums, there is section jyst about power supply. Read them all, and then think about it again. Not to turn you off on building your carputer, but I think you are rushing. There is many options, but the best is to find one that has everything, but since you are in a budget, I think that will be very difficult. I'm new to the forums, but I have been reading a lot so I recommend you doing the same. Building a carputer is not the same as building your home dekstop computer. Althought it uses many of the same parts, there are differences that you need to know about.

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          • #6
            As I said I did look around, but didn't understand much about the power supply.
            Anyway I took a look on the power supply in my desktop computer, and I found out that its outputs about 5v or somthing like that to each line(e.g. board, HD, CD). Can't I just use a tranformator(or somthing like that) that will be pluged into the cig socket and will output 2 lines of the power I need?

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            • #7
              Originally posted by Gn0MiCK
              As I said I did look around, but didn't understand much about the power supply.
              Anyway I took a look on the power supply in my desktop computer, and I found out that its outputs about 5v or somthing like that to each line(e.g. board, HD, CD). Can't I just use a tranformator(or somthing like that) that will be pluged into the cig socket and will output 2 lines of the power I need?
              Your ATX power supply on your desktop computer puts out LOTS of voltages (+/- 5VDC, +/- 12 VDC, 3.3 VDC, 5VSB, etc) - your cig socket only puts out +12VDC - or really +8VDC to +14.5VDC or so depending on your charging system. You have to "convert" (transformers are used for AC - Alternating Current - applications) the 12VDC to all of the other voltages. Search the forums - ther are 2 primary ways to do that in a car application:

              1) Use a 12VDC to ATX converter Board - I found mine on eBay for $30. This does a direct conversion (very efficient - ie. less heat) to the ATX standard voltages you will need for your MB, HD, CD/DVD etc.

              2) Use a 12VDC to 120VAC inverter then your standard ATX power supply. This does a double conversion (DC -> AC -> DC) - not very efficient - sometimes ignition noise is a problem.

              Good Luck

              Comment


              • #8
                I think I'm getting the picture

                1) Use a 12VDC to ATX converter Board - I found mine on eBay for $30. This does a direct conversion (very efficient - ie. less heat) to the ATX standard voltages you will need for your MB, HD, CD/DVD etc.
                So this is kind of an electric circuit that it's input is not regulated(8-14V like the cig socket), and outputs directly to the things that I want to turn on(HD and board), a regulated current about 5V or so?

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                • #9
                  hey look at this: http://cgi.ebay.com/ws/eBayISAPI.dll...category=32814
                  Can I use it and just connect the computer to the output and it will work?

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                  • #10
                    Originally posted by Gn0MiCK
                    hey look at this: http://cgi.ebay.com/ws/eBayISAPI.dll...category=32814
                    Can I use it and just connect the computer to the output and it will work?
                    Kind of overkill - 300 Watts - but it should work with your desktop system. Just plug it in to the 12VDC cig socket and plug your 120VAC computer into it and you should be good to go.

                    With 300 Watts continuous you should be able to run several of your friends computers !!

                    Good Luck

                    Comment


                    • #11
                      Originally posted by Gn0MiCK
                      So this is kind of an electric circuit that it's input is not regulated(8-14V like the cig socket), and outputs directly to the things that I want to turn on(HD and board), a regulated current about 5V or so?
                      Yes this DC-DC Board takes the 8-14 VDC and outputs the standard ATX voltages (+/- 5VDC, +/- 12VDC, +3.3, +5VSB)


                      http://cgi.ebay.com/ws/eBayISAPI.dll...gory=3670&rd=1

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                      • #12
                        Ok, lets give you some guidance. If you have that power inverter and turn your engine off, two things might happened:

                        1) Your computer will remain on (i think it depends how the cig socket is wired) and if you forgot to turn off your comp, your battery will drain.

                        2) Your computer wo'nt shutdown (if your cig socket is wired directly to your ignition) properly. This might be ok once in a while, but if you do it very often, I don't think your HD, windows, will like it.

                        ----

                        And again, if you use a power inverter and turn your engine on, you have to manually turn your computer on. And you will need to have a power switch infront if you have the case in your trunk.

                        ----

                        So what solution are there? I recommend you getting a shutdown controller with a power supply that is dc-dc. You can get the OPUS 150W power supply.

                        http://www.opussolutions.com/150watt.html

                        However, the price is a bit high for some people, but there are advantages of using the OPUS power supply. Another solution you can go for is to buy a shutdown controller (anyone knows where to get that?) and use a DC-DC power supply. Or you can use your desktop power supply, shutdown controller and a power inverter.

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                        • #13
                          How much does the Opus cost?

                          Comment


                          • #14
                            Great!

                            I am on the right way so this is good.

                            Now, how much power do I need? I mean, in WATTS, because there are many, from 150W to 1000W.

                            I don't want my car's battry to die fast so, can someone tell me from his experience, how long his car's battery last using this kind of power supply?

                            For conclusion, there are 2 primary ways to supply power to my system and they are:

                            1) Use a 12VDC to ATX converter Board - I found mine on eBay for $30. This does a direct conversion (very efficient - ie. less heat) to the ATX standard voltages you will need for your MB, HD, CD/DVD etc.
                            2) Use a 12VDC to 120VAC inverter then your standard ATX power supply. This does a double conversion (DC -> AC -> DC) - not very efficient - sometimes ignition noise is a problem.
                            Now, I haven't found the first option in 30 bucks, but I found the second, as I posted earlier, and it was about 30$, and later I found a 150W in 20$.

                            As the power supply unit is the only thing I need to buy(my brother works in a computer shop - gave me some parts ), I really want to buy the cheap option, which will be 12VDC to 120VAC, but then comes the car's battery matter - which method will kill it first?

                            Thanks ALOT!!!

                            Comment


                            • #15
                              If you are not into buiding/playing around with tehnical stuff and since your budget is limited the best is :

                              Use the original ATX PSU that came with your PC.

                              Buy a 12V - main inverter. The power is about 150W/300W/600W and so on. The 300W is ideal for most PC...unless you wanna power more device out of it.

                              You can forget about the shutdown controller for now...as I dont think there is any have been designed specifically for inverter users. It is quite easy to design/build a simple one but thats up to you if you wanna do that.

                              Your next enemy is the cranking problem, you can build one using lead acid battery and diode/relay...unless you can live with rebooting each time you crank the engine.

                              I think thats the easiest and chepeaest solution for you

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