Using a mini-USB connector to power things from a PS seems to be quite
common these days for things like phones, Tom-Tom, etc. Presumably only
using some of the 'pins' on the connector as there is no data being
transferred. Are they universal? Assuming the PS supplies enough current
will any one work with another, as it were?
*Dancing is a perpendicular expression of a horizontal desire *
Dave Plowman email@example.com London SW
In my experience - no. I have a Hudl, I attempted to charge it with the
wrong charger that had an identical (or so I thought) USB cable
connection, it failed and I thought the Hudl had a problem, until I used
the correct charger and cable.
Not quite. But close enough that I use mine pretty much interchangeably.
Some USB3 are capable of supplying nearly 900mA whereas the standard
USB2 ones are only good for 600mA and weedy PSUs might not manage that.
Smart devices wanting more power are supposed to negotiate with their
host to get it, but some things just go gimmee gimmee gimmee.
The general rule of thumb is that they mostly work interchangeably but
it may take a longer to recharge a power hungry device from a weedy USB
PSU. It is the assumption that all can supply the correct current that
might be an issue. Some power hungry peripherals have a pair of USB
connectors on them so that they can take current from two USB sockets.
It is a *HUGE* improvement from the early era of mobile phones when
every manufacturer and model seemed to require a different charger,
voltage and physical connector with ever more peculiar shapes!
Shame that laptops are still not fully standardised. I have collection
of old PSU blocks for them in a drawer ranging from 14v up to 19v.
Mostly centre positive but you can't take it for granted!
I'd agree with Martin that supplies and devices are *mostly*
interchangeable - but I don't have anything from Apple, which probably
I've successfully charged phones, satnavs, e-readers etc, from each others
supplies, and from desk PC's and (esp. away from home) a netbook.
One very good thing about the USB standard is that the voltage concerned is
always 5 volts at a specified polarity, irrespective of current availability
and odd resistor "fiddles", so it's reasonable to assume that even if a
device isn't properly charged from a particular supply - no harm will be
This email is free from viruses and malware because avast! Antivirus protection is active.
Not charger related - but 3 easily done 'wrong USB connections'
# On some devices the micro USB socket is not that sturdy and it is
possible to insert plug upside down.
# You can plug standard USB plug into an Ethernet socket (not good)
# You can plug standard USB plug into a PC USB socket the wrong way
UK SelfBuild: http://uk.groups.yahoo.com/group/UK_Selfbuild/
On Fri, 01 Aug 2014 13:15:31 +0100, Dave Plowman (News) wrote:
One gotcha, is car chargers. I use my Nokia 620 as a satnav, and noticed
that when it was "charging" from the 12V USB adapter, it slowly lost
charge until dying.
Swapping chargers with my wifes phone (which was marked "1A", whereas the
orginal was unmarked) fixed the problem, and now I can satnav all day
*and* charge the phone.
The only risk of magic smoke is if you plug something impolite about
taking maximum permitted current without bothering to ask into a USB
socket on something smart that is weedy and unable to comply.
Most times the worst that will happen is that the USB charger will be
slower than it should be because it can't source the same current as the
units proper charger. It helps now that cars have USB sockets.
Given the short battery life of smartphones you can't afford to be too
picky about where you charge them...
Unlikely, as the chipset on the output side *should* limit the available
current independently of any negotiation, so even a dead short across
the power lines won't cause damage. Similarly, the chipset on the input
side will limit itself to what it can take safely.
One reason I like Nokias, as they tend to have better battery life.
Not meaning to pick you up too much on a very reasonable generalisation.
My Nokia 925 was the absolute worst phone on the planet when running any
navigation app. I managed to flatten in under an hour despite being
plugged in to an external battery pack as well. My Nokia 1520 is pretty
damned good almost whatever you run on it.
I agree that it shouldn't happen in well designed circuits, but I have
my suspicions about some cheap budget stuff cutting silly corners.
There is a chance that some high draw devices like satnavs might
continue to discharge their own battery if the PSU is inadequate.
Me too. I kept a 6303 going until last year when I discovered the hard
way that it doesn't like being dunked in a bucket of water. The battery
life was phenomenally good nearly two weeks running on a single charge.
Some folk I know have to recharge their smartphones at lunchtime...
I suspect CandyCrush Saga is a battery thief!
As they all seem to use the same chipsets, I'd expect it to be rare, as
long as the makers use the reference design, which seems to be a single
chip on a PCB, with a tiny coil and couple of other bits with some
suppression components if you're lucky. All the current limiting and
control logic is on the chip, with everything preset and no adjustments
for the manufacturer to get wrong.
Just don't ask how *I* know this....
Even the Lumia 520 I bought recently lasts me a couple of days, but I'm
a light user.
Not to mention all the other games that phone home to download the
adverts that pay for them.
They don’t actually. The worst of the non genuine chargers don’t even
bother to use any chipset at all and just use a single discrete transistor
for the 'regulator' and if you kill that, you can end up with the full
unregulated voltage being delivered to the device being charged.
That’s been proven with destructive testing on youtube.
The worst of the non genuine chargers don’t.
Pity about the non genuine chargers that don’t even bother
with the chip at all to save a few cents over a single transistor.
And some of the teardowns and destructive testing of smartphone
chargers on youtube shows that the worst of them are utterly obscene
and not only don’t bother about protecting the charger, they can fail
in a way that destroys what is being charged in the process of dying
basically as the 'regulator' of the 5V output delivers the full
unregulated voltage to the device you are attempting to charge.
But it turned out that even something like the
N95 had a pretty pathetic time on battery.
And you didn’t get anything like that with the N95.
And now there is fuck all on the way of decent
android phones from Nokia anyway.
Yeah, the obsession with super thin phones by clowns like
Apple is the main reason for that sort of utter stupidity.
Its quite possible to run the battery flat in a couple hours
in a garage/yard sale run that starts in the dark so you
need to use the torch a bit.
It seemed to go from weird and wondeful to mini uSB to micro USB. I was
told that it has recently been decided to standardise on micro USB for
all devices using a USB connnection for power and data.
Until theybuggrem change their minds again...
(Apple are of course excluded from this generalisation)
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