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Any feedback on these? I'm a little concerned about voltage regulation ... I see the home charger brick specifies an output of 12v, 2A, but I know a car's electrical system often outputs 14v or more. Also, is the amperage controlled (fuse, etc.), as 2A is a pretty low threshold.

Anyone used one of these enough to know if they're safe?

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I have an identical one. Is working but it moves sligtly in the car socket. I did move it too much and blew the cigaret lighter fuse in my car.
 

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I found a post somewhere else.
Lost the URL, but still had one tab open as I was closing this tab decided to help you out.

Basically
Any car charger will work provided that the connector is correct.
Somebody on that post mentioned that you want to be VERY careful about starting the car with the device plugged in.
Actually any device, since the voltage will drop and then spike.

The Chipset Is located at http://www.kitarm.com/news/205-cortex-a9-nvidia-tegra2-tablet-pc-with-10.html
The charger gives 12 Volts to a regulator that drops the voltage down to the 7.6 volt in the battery, but also puts out smaller voltage such as USB.

The regulator that "talks" to charger can take up to 18 volts.
The regulators are either TPS658621A or TPS658621C,
http://www.ti.com/product/tps658621a

Parts are as follows
nVIDIA Tegra2 1Ghz dual core
hynix DDR2 1Gbit HY5PS1G831C FP-S6
hynix HY27UF084G2B
WIFI USI
KLMAG4EEHM-B101 moviNAND 16GB,14*18mm,FBGA-169
PMIC : TPS658621A TPS658621C
SMSC USB2514B USB HUB
TI LVDS LVDS83B
codec Realtek ALC5623
mini PCI-E
Battery 7.4V,3500mAh,25.9WH

hope this helps
 
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