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From 12VDC to 12VAC

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  • From 12VDC to 12VAC

    Hello all,

    Im tired of searching my answer on . Simply because I couldn't find any. So here is my question.

    Ive tried to make a sound dock from my Computers Speaker installation. Its 2 speakers and 1 sub woofer. I want to connect an 12V Battery to it so I can take the instalation to my gym. The Only problem is that the Battery is 12VDC and the speaker installation works on 12VAC. I need an invertor but I can find any.

    Anyone that can help me out with this one?


    Already thnx,
    09

  • #2
    Are you sure it operates on 12v dc? Even if it plugs into the wall, if it is a power brick, it usually coverts the 120v ac down to 12v dc. LOok on the brick and read what it says the output is. It will most likely say something like 12vdc.

    If so, you only have to cut the wire an connect the loper one to the proper terminal on the battery.
    Originally posted by ghettocruzer
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
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    • #3
      Well, first off all Im Dutch. I can understand most of the terms that are being used but not all of them.

      The Electricity that comes out off the wall is AC. Ive readed it @ arround 13V. The Electricity that an 12V Battery gives is DC.


      But if you are saying that I can cut the cable and connect it to a 12V Battery I could try that.

      Maybe some Photos would help?


      Thank you for the quick anwser

      Comment


      • #4
        i never in my life seen anything that operates on 12v AC!!!!
        do what bugbyte says

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        • #5
          So you are saying that the electricity that comes out of the wall is AC and gets inverted to DC by the speaker itself?

          So I can just go buy and 12V Car/Scooter Battery , Strip the cable and hook it up?

          Comment


          • #6
            Take a picture of your power adapter, that will help
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            • #7
              The electricity coming out of the wall is 230VAC, so how come you are only measuring 13V???

              Answer - it is being converted.
              If it is merely a transformer, it might be 12VAC.
              If the transformer includes diodes, or its is a transformerless SMPS, then its output is almost certainly DC.


              Measure the "13V wall output" on both AC and DC ranges, and swap the test-lead direction for both tests. WARNING - I do not mean test the wall outlet, but the output from whatever power supply you plugged into the wall outlet and measured the "13VAC".

              Compare that to the same test on a 12V car battery.
              Much difference?


              If you load is AC, it's probably better finding its internal DC voltage....
              Chances are it will work of a car battery anyhow, though possibly with reduced output.

              Comment


              • #8
                Originally posted by Jetforce2009 View Post
                Hello all,

                Im tired of searching my answer on . Simply because I couldn't find any. So here is my question.

                Ive tried to make a sound dock from my Computers Speaker installation. Its 2 speakers and 1 sub woofer. I want to connect an 12V Battery to it so I can take the instalation to my gym. The Only problem is that the Battery is 12VDC and the speaker installation works on 12VAC. I need an invertor but I can find any.

                Anyone that can help me out with this one?


                Already thnx,
                09
                okay the reason you wont find anything on google about 12VAC is the fact that nothing runs on 12VAC, as explained you have a "brick" that converts the AC to DC, your speakers more than likely run on 12VDC so my suggestion is cut the wire from the brick, connect the positive terminal of the battery to the wire with the white stripe, the negative to the black one and walla, you have power!
                MY INSTAllS:

                http://www.mp3car.com/vbulletin/show...e-install.html

                http://www.mp3car.com/vbulletin/show...tallation.html

                Comment


                • #9
                  Originally posted by Jetforce2009 View Post
                  Well, first off all Im Dutch. I can understand most of the terms that are being used but not all of them.

                  The Electricity that comes out off the wall is AC. Ive readed it @ arround 13V. The Electricity that an 12V Battery gives is DC.


                  But if you are saying that I can cut the cable and connect it to a 12V Battery I could try that.

                  Maybe some Photos would help?


                  Thank you for the quick anwser
                  1. If you live in the Netherlands, it is 230 volts AC from the wall. There is no 12 volts AC. The brick you are plugging in contains a transformer that converts the power to 12vdc.

                  2. Use a multimeter to measure the power at the end of the wire that plugs into the speakers. That is almost sure to be 12vdc.

                  3. If so, cut the wire and connect the + to the proper battery terminal and the ground to the proper battery terminal. I NEVER go by the wire color or striping. Always measure t with a digital multimeter to test it, first.

                  4. There are many tutorials on YouTube that explain how to use a multimeter. It is your best friend!
                  Originally posted by ghettocruzer
                  I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
                  Want to:
                  -Find out about the new iBug iPad install?
                  -Find out about carPC's in just 5 minutes? View the Car PC 101 video

                  Comment


                  • #10
                    Originally posted by Bugbyte View Post
                    1. If you live in the Netherlands, it is 230 volts AC from the wall. There is no 12 volts AC. The brick you are plugging in contains a transformer that converts the power to 12vdc.

                    2. Use a multimeter to measure the power at the end of the wire that plugs into the speakers. That is almost sure to be 12vdc.

                    3. If so, cut the wire and connect the + to the proper battery terminal and the ground to the proper battery terminal. I NEVER go by the wire color or striping. Always measure t with a digital multimeter to test it, first.

                    4. There are many tutorials on YouTube that explain how to use a multimeter. It is your best friend!
                    very true, good call!
                    MY INSTAllS:

                    http://www.mp3car.com/vbulletin/show...e-install.html

                    http://www.mp3car.com/vbulletin/show...tallation.html

                    Comment


                    • #11
                      Originally posted by david69leonard View Post
                      okay the reason you wont find anything on google about 12VAC is the fact that nothing runs on 12VAC
                      Never say never. Back in the day, I had a phone modem that was powered by a 12vac power adapter (really just a transformer). I think I probably still have one around here somewhere...

                      Sorta like these.

                      Since 12vdc-12vac doesn't seem that common, it might just be easier to get a small cheap 12vdc-120vac inverter and use one of those transformer adapters like I linked.

                      Comment


                      • #12
                        Well,

                        Thnx for the quick replies. I will test it with my father tonight. If it doesnt work then I will tell you. If it does then I will carve all your names in the speakerbox =D


                        Cheers,
                        09

                        Comment


                        • #13
                          There are 12VAC plugpack and loads - as there are just about any "low voltage" plugpacks & loads both ac & dc.
                          However ac tends to be rare - since most loads are dc, why not let the plugpack contain the filtering and interference?

                          But audio AC plugpacks - VERY rare! So to laptops.....

                          Comment


                          • #14
                            i have some computer speakers that have a power supply that is rated to convert 110 ac to 9v ac, but on my houses 113-120, it puts out around 12vac... does that count?
                            My OLD 2001 Mitsubishi Eclipse GT:
                            "The Project That Never Ended, until it did"


                            next project? subaru brz
                            carpc undecided

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                            • #15
                              As a supply that is AC or DC and anywhere from VLV (~1.2V) to moderate voltages (36-72V etc)... yeah, I think it counts.

                              The only PSU that shouldn't count are car audio systems... why get 12V to the amp and THEN convert it to 40V or 70A etc. Why isn't that done at the battery?
                              (That's a rhetorical question if you are a capitalist.)

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