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Thread: Options for powering router that uses 9V DC?

  1. #1
    Variable Bitrate
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    Options for powering router that uses 9V DC?

    I am looking at getting a USB 3G dongle for my car computer, and I don't really want to run it on the computer itself.

    I was looking at using something like the TP-LINK TL-MR3420 that can do the 3g sharing, and has wireless as well, so I can set up a mobile hotspot, and have my computer connected to the net.

    But, the power brick on this unit outputs 9V DC, not 12V like most other routers.

    So, do you think I could run this model on 12V regulated (use the M4-ATX 12V to run the unit), or is there a circuit I could solder up that would drop the 12V down to 9V to power this system?

    I would be powering it off the M4-ATX, as that way it starts and stops with the computer, so it wouldn't drain the batteries.

    This model comes in at $89AUD, so if there are any other units that are around the same price and take 12V (Or even have Gig eth ports!!), what options are there? (Don't mind ordering from the states or elsewhere either!).

  2. #2
    Raw Wave
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    Stick to 9V unless you want to risk damage.
    Chances are it drops to a lower voltage internally....

    So you are going to have other PCs in or near your car to connect via your 3G?

  3. #3
    Maximum Bitrate DaveDog's Avatar
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    DCL11-xx point of load power supply right here at the MP3Car store. Description suggests it's 5V only but look at the manual...

    http://www.mp3car.com/products/Power...er_20Guide.pdf
    TruckPC - gutted, being used for test setup
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  4. #4
    Raw Wave
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    All that for a mere 15W output?
    It doesn't even step-up.

  5. #5
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    I was thinking more along the lines of being able to drop it via resistors soldered inline with the power lead?

    If its using the clean 12V from the M4, wouldn't I just be able to knock that down to 9V by adding resistors? Or is that too much of a drop?

    The other option is waiting until I can get hold of the router, and once I strip it, I can find out what voltage regulator is on it, and check the datasheet, see if it will take 12V input.

  6. #6
    FLAC SNOtwistR's Avatar
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    i just found a 9v 1.5a cig charger and cut the end off put in project box and wire to car 12v fastest solution i could find for my in-car 3g wifi router and was cheap too 10 bucks just my 2 cents SNO

  7. #7
    Raw Wave
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    Quote Originally Posted by Chester View Post
    I was thinking more along the lines of being able to drop it via resistors soldered inline with the power lead?
    Only if is it is a constant load, and a constant supply (ie regulated).
    I suspect you don't have either.

  8. #8
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    Quote Originally Posted by OldSpark View Post
    Only if is it is a constant load, and a constant supply (ie regulated).
    I suspect you don't have either.
    I think you might be right there too!! hehe

    Ok, will have a look for what SNO suggested, see what options there are, at least I don't have to rush this part, as there will be some fab involved in it (going to remove the LED's off the router and extend them into the dash for feedback etc).

    Thanks for the input all!

  9. #9
    FLAC
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    Definitely just go to radio shack or something and pick of a 9 volt lighter adapter. Definitely enough power for a router, and definitely, the cheapest way.
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