I want to buy a 32GB memory card for my new Samsung Galaxy Note 3
and I see "Type 1 class 10" and "Type 2 class 10".
Googling, I see they use the word "type" for card types such as
compact flash and SD, etc., but no good explanation of the difference
between card types at any one class.
Also, I have never seen a 5.3 volt USB charger, but the OEM charger
seems to be 5.3VDC and 2.0 Amps.
Must I get a car charger that is 5.3 volts?
(That's going to be hard to find.)
the class is the speed. don't worry about the type.
usb must be 5v +- 0.25v, or 4.75-5.25v, which means the oem charger is
not usb compliant.
they probably did that to reduce charge time but that's a really *bad*
way to do it.
what really matters is the amperage, and that's 2a. there are many 2a
Here's a picture of the OEM EP-TA10JWS charger, showing the 5.3 volts!
(Amazon.com product link shortened)
What I'm worried about is that I can't find a car adapter that
is 5.3 volts and 2.0 amps or more.
Duhhhh... and here's a picture showing a charger with *exactly* the same
product code (EP-TA10JWS) with the correct voltage (5.0v) in the product
label and text of the web page.
<(Amazon.com product link shortened)>
Looks like there's a *mistake* in the wirelessground.com web page, it
should say 5.0v not 5.3v. So a 5.0v car charger would be the right
choice for you.
... got the picture yet?
The move to USB 3.0 only affects charge rates connected to a PC.
2.x is limited to 500mA while 3.x is 900mA I think.
Both standards use 5V, but 2A AC chargers often run a bit higher at 5.3V.
The chargers don't directly adhere to either USB spec and basically
trigger fast charge the same as before, by shorting out or putting a
fixed resistance between the data pins.
My old HP TouchPad USB 5.3V/2A charger with 2.0 cord charges my Note 3
just as fast as the Samsung 5.3V/2A adapter with USB 3.0 cord does.
If you look closely, you'll notice that the "USB 3.0" Samsung charger
doesn't actually have the extra 3.0 pins, it uses a 2.0 port. That's
because for pure charging devices the standard doesn't matter, only the
current and voltage rating and that it shorts the data pins.
It'll be fine.
The USB spec goes up to 5.25V. The extra 50mV won't fry anything.
In fact, the device probably won't even see it. If you're drawing 2A, you'd
lose 50mV by a 25milliohm resistance in the cable. Given that USB cables
contain hair-thicknesses of copper these days, that's not unlikely. I've
seen cables with 1 ohm resistance. In fact, to get a resistance as low as
25mohm you'd need about 0.75mm^2 of copper - that's roughly the thickness of
the cable that powers your desktop PC.
A lower current draw will have less voltage drop, but any way you look at it
what the device sees will be in spec. And the device would cope just fine
with 5.3V straight, the DC-DC converter will have a much bigger margin.
The nominal 5.3V is already out of spec, who knows what the tolerance is
on it, +/- 5% perhaps, so now it could be 300mV over, then someone
charges an unprotected e-cigarette from it and ...
It is not that super critical. As long as charger is good quality.
Also if you get wrong micro SD card, it won't work well. For example too
fast one some times gives trouble. Follow the manual. Get a brand name
like Samsung, Lexar....
I think the class is speed: for general storage purposes it doesn't
matter, but for e. g. storing (or rather, recording and playing back -
storing alone is OK of course) video, you need above a certain class.
The _type_ I _think_ may refer to an older format change that is also
sometimes referred to as HD - high density - in the case of SD cards:
some older equipment can't use cards that are HD. Non-HD cards go are
mostly up to 2G in size, though a few 4G are available; I don't think
you can find HD ones below 4G. But I could be wrong in thinking types I
and II are the same as non-HD and HD.
I doubt it. Does your 'phone show "charging" when connected to a
friend's charger that doesn't say 5.3? Does it charge when connected to
a PC? You could always try anyway - they're cheap enough, if you can't
J. P. Gilliver. UMRA: 1960/<1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf
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