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  1. ksi69's Avatar
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       #1  
    Here's what I discovered imperically.

    1. The touchstone will not work via generic 12VDC/5VDC USB power adapter, and the Palm Pre Micro-USB Cable.

    2. I tried three different adapters. Their power output is the same as the Palm Pre 120VAC/5VDC USB Charger (5VDC @ 1 AMP). No joy.

    3. It will work just fine in the car using a 12VDC/120VAC inverter, and then using the Pre 120VAC/5VDC USB Charger. It will also work using this method and any generic 120VAC/5VDC USB Charger.

    4. I believe that the Touchstone relies on the 60 Hertz ripple that rides on USB 5VDC when that DC is derived from 120VAC (60 HZ). The 60 HZ ripple is not there when the 5VDC is derived from car power. The Touchstone probably uses the ripple, in lieu of an oscillator, to generate the frequency for induction coupling of charging power to the Pre.

    All of this is from as engineer's prospective. Hope it helps.
  2. dgeezer's Avatar
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    #2  
    Actually mine does work. The only car adapter I had available was the Sprint pre car charger. It has the same usb plug as the ac charger.it won't fit in the recessed slot though. I rubbed it down using some 80 grit sandpaper laid flaton my desktop.

    Now the plug will fit and it works fine as far as I can tell.
  3. dgeezer's Avatar
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    #3  
    wow, that's the longest message I've ever typed on my pre.
  4. OSU0034's Avatar
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    #4  
    Quote Originally Posted by dgeezer View Post
    wow, that's the longest message I've ever typed on my pre.
    Nicely done.
  5. #5  
    Considering that its your 3rd message overall (on this Precentral forum at least), it shouldnt be surprising!

    Palm (or someone) please come out with a car holster with inductive charging!!
  6. sjjones's Avatar
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    #6  
    There are 2 threads over in the PRE ACCESSORIES area of the forum regarding mounting a touchstone in your car

    http://discussion.treocentral.com/pa...one-mount.html

    http://discussion.treocentral.com/pa...its-alive.html
  7. #7  
    Please Post your Topic in the Pre Accessories Forum.

    http://discussion.treocentral.com/pa...d-threads.html

    Thanks,
    Berd.
    Just call me Berd.

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