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  1. Hicks's Avatar
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       #1  
    In preparation of buying TT Navigator 5 I have purchased an adjustable AC/ DC adaptor, and have some questions...

    The GPS receiver specs state that the voltage is 4.75- to 6.0.

    My charger has switchable voltage that ranges from 1.5 to 12. The nearest to the above is 6 volts.

    It also has 7 adaptors that differ in size. Each one has a different set of numbers on them:

    5.5 x 2.1
    5.5 x 1.5
    5.0 x 2.5
    4.75 x 1.75
    4.0 x 1.7
    3.5 x 1.35
    2.35 x 0.75

    I assume that the first number on each is the actual size in mm. I don't know what the second set mean.

    The charger instructions are:


    Ensure the current required by the appliance does not exceed the rated current.
    Check the polarity and input plug size match on the appliance (there is a sketch showing the adaptor tip polarity; each tip has a + and - on them).

    In short, I'm confused! I assume I set the charger to 6V and select the tip that fits the GPS unit most closely. The polarity thing is a mystery though.

    Any help is appreciated.
    It's not that I'm so smart, it's just that I stay with problems longer- Albert Einstein.

    Palm M505> Palm Tungsten E> Treo 600> Treo 650> Treo 680> Sony Ericsson P1i (running Styletap BETA)> iPhone 3G 16GB

    Macbook Pro 2.4GHz Intel Core 2 Duo
  2. Hicks's Avatar
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       #2  
    One other question:

    Is it safe to leave the GPS unit on charge in a vehicle that isn't running for hours on end, i.e. will the charging process flatten the car battery much?
    It's not that I'm so smart, it's just that I stay with problems longer- Albert Einstein.

    Palm M505> Palm Tungsten E> Treo 600> Treo 650> Treo 680> Sony Ericsson P1i (running Styletap BETA)> iPhone 3G 16GB

    Macbook Pro 2.4GHz Intel Core 2 Duo
  3. Hicks's Avatar
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       #3  
    Bump
    It's not that I'm so smart, it's just that I stay with problems longer- Albert Einstein.

    Palm M505> Palm Tungsten E> Treo 600> Treo 650> Treo 680> Sony Ericsson P1i (running Styletap BETA)> iPhone 3G 16GB

    Macbook Pro 2.4GHz Intel Core 2 Duo
  4. #4  
    I'm not sure about your adapter designations. The polarity issue relates to whether the center electrode on the plug is + (more common) or - (less common). Similar to the + and - terminals of a battery. There should be a symbol on the adapters that looks like a crescent with a dot in the center and + or - signs by each indicating whether the center electrode or surrounding cylinder has + polarity. It's likely that your charger will work at the 6v setting if you have the correct adapter for the TTMkII. I avoided the AC charger issue by getting a small 120v AC to 12v DC converter that I can plug the car charger unit into. They are fairly common and cheap now.
  5. Hicks's Avatar
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       #5  
    I never noticed that the crescent shape faces opposite directions on the adaptor! Good point.

    I've set it up as a + polarity (according to the charging diagram). Hopefully this is the correct set up? I'd hate to fry the battery.

    TT GPS was delivered today and I was allowed a peek at the car charger (xmas present from my girlfriend!) so I'm pretty confident that the correct sized adaptor is the 4.0 x 1.7. I now think that the second dimension is the internal hole size of the adaptor.

    Thanks for your thoughts.
    It's not that I'm so smart, it's just that I stay with problems longer- Albert Einstein.

    Palm M505> Palm Tungsten E> Treo 600> Treo 650> Treo 680> Sony Ericsson P1i (running Styletap BETA)> iPhone 3G 16GB

    Macbook Pro 2.4GHz Intel Core 2 Duo
  6. Hicks's Avatar
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       #6  
    I also emailed TomTom and their response was:

    TomTom can only support our chargers for our products. Are you using a TomTom Bluetooth receiver and you bought a charger for it? If you bought a charger other than TomTom we can not offer support. The output of our DC adapter is 5 volts positive DC for the TomTom bluetooth receiver.



    I'm just going to set my charger to positive polarity, 6V and hope for the best
    It's not that I'm so smart, it's just that I stay with problems longer- Albert Einstein.

    Palm M505> Palm Tungsten E> Treo 600> Treo 650> Treo 680> Sony Ericsson P1i (running Styletap BETA)> iPhone 3G 16GB

    Macbook Pro 2.4GHz Intel Core 2 Duo

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