wow, certainly doesn't sound very green to me. i suppose it's akin to using IR for data transfer instead of a USB cord.
On 9/5/09, lelandlcox <[email protected]> wrote: > The Touchstone uses a lot of current compaired to plugging into the side > port! Most USB ports will not supply enough power to charge the PRE with > the Touchstone but will sucessfully charge with the side port. > > There may also be a problem that some USB cords will not carry enough > current to to use with a Touchstone. > > > The Touchstone must take the 5 Volts from the USB plug, convert the DC to AC > and raise the voltage level well above the 5 Volts. This AC Voltage is > induced from the Touchstone to the PRE with a coil in the Touchstone and the > special back for the PRE. This is a loosely coupled transformer. > > The PRE has to take the AC and convert it back to DC and regulate the > voltage to properly charge the battery! Lots of loss in the conversion > processes and the inductive coupling requires a larger current supply for > the Touchstone to work! > > > Leland Cox > > > --- In [email protected], Don Pomplun <bluefl...@...> wrote: >> >> I just picked up a plug-in Lenmar charging pack with 4 USB ports to >> take on a trip. Checking it out before the trip, I find some strange >> things that seem related to Palm cords -- I have the one that came >> with the Pre and a similar(shorter) one from the Palm car >> charger. Either cord used with a Touchstone, plugged into my PC's >> USB port won't charge., but plugged directly into the side USB port >> on the Pre works as expected. >> Either cord used with the Palm Wall wart works OK on Touchstone or >> side port. But plugged into the (2 amp) Lenmar only works on the >> side port, not the TS. >> Strangely the Palm cords work with the TS using my Kindle charger. >> wazzup? >> >> Don (CA) >> >> [Non-text portions of this message have been removed] >> > > >
