First disclaimer: I'm new to TW, and I searched lots of threads specific to the USB idea I have... but, I didnt find anything quite what I'm thinking.
Second disclaimer: This might not be the right forum, ... it might be close to being the right one!
Third disclaimer: I don't know a whole lot about electric, although I get real attentive when it begins to smoke and spark.
So here's the idea:
I'm trying to put together a semi-mod 'off-the-shelf' solution for a dedicated USB charging port for a Samsung Note II used for nav, mp3, and misc stuff like phone calls ... anyway, the device is a real power hog.
I've learned that 5 volts is the USB charging standard, and that many/most adapters push (at best) 1000ma. Some I have found can push 2100ma.
This panel mount device from Blue Sea (part number 1016) has a 2.1amp and a 1.0amp USB port... The square bracket is removable for a clean install. It looks like the quickest solution ($25-$30 + wire and adapt-a-fuse.)
The next option is piecing together two separate components, with the benefit of gaining 3amps total power output...
This picture is a 12v to 5v converter, 3amps 15watts w/ attached female USB port ($6 on Amazon), which could be used as a 'stand alone' setup:
and this is a straight panel mount USB port with a 6' cable ($12 on Amazon).. this length could make an install just about anywhere in the cab (used with the converter above):
From reading Wikipedia (http://en.wikipedia.org/wiki/Universal_Serial_Bus#Power) I think I understand that some devices use the two inside data pins (D+ / D-) to determine if they are conected to a 'dumb' charger or a data port. I read elsewhere that some devices (including Samsung) may need to 'read' 200ohms resistance between D+ and D- to accept the 'charge only' mode, and that a 'cheat' can be done by shorting D+ to D- directly (without adding a resistor.) The two outer pins are the positive and negative power leads.
If the last scenerio is necessary, than the following combo would work (with a 200ohm resistor added?):
Would this idea work?