Re: [OT] iPad query...

["domdevitto" <dom@xxxxxxxxxxx>]

(Technically the USB2 is 500mA per port, not over the whole hub - I
have a hub with a 2A transformer)

Completely agree/understand - but I was suggesting that for a powered hub,
the power often comes in via a 240vdc transformer, dropping the hub's input
to 12v (and maybe 5v too, but this can be done via a single parallel
resistor, IIRC) - so basically I was hoping that if the *input* current to
the hub was increased, that may be - as you suggest - directly wired to the
output ports.

In short, try plugging a pwered hub into a 10W ipad charger and see if that
gives you extra juice per port, in the hope that the 12/5v lines are just
linked across from the wall-plug.

THis would save all th faffing about and breaking out wires from USB cables
:-)

Dom

--- In ukha_d@xxxxxxx, Peter + Jane <pandj.munnoch@...> wrote:
>
> Hi Dom
> In original thread it was stated that a powered hub limits to usb
500mA spec.
> The robust answer seemed to be to have a box /
> lead where the usb in was split into power and
> data with a usb plug for each...one to computer
> for data other to charger. Easy to do (black and
> red = power, green and white = data IIR my usb colour codes).
> I was hoping someone had tackled what must be a
> common issue and made a neat solution / saved me a job!!
> Rgds
> Peter
>
> At 01:05 11/03/2011, you wrote:
> >
> >
> >Hmmmm,
> >
> >I think you may even be able to take a powered
> >hub that uses a usb connection for power, also
> >works non-powered, and power it via the Apple
> >power adapter. My thoughts are that the 5/12v
> >rails will be pass-through when using an
> >external power - of course, running 2A through a
> >hub that expects less may not be good.
> >
> >Also worth experimenting as:
> ><http://www.tuaw.com/2010/04/08/confirmed-not-charging-ipad-does-recharge/>http://www.tuaw.com/2010/04/08/confirmed-not-charging-ipad-does-recharge/
> >suggest/confirm that at least when idle, it stills charges on
500ma USB ports.
> >
> >Dom
> >--- In
> ><mailto:ukha_d%40yahoogroups.com>ukha_d@xxxxxxx,
> >Peter + Jane <pandj.munnoch@> wrote:
> > >
> > > Hi
> > > Back end of last year there was a long thread
> > re sync-ing and charging iPads.
> > > The basis was that an iPad needs 2 amps and usb delivers
just 500mA.
> > > Someone (Dave Mclaughlin?) was looking at
> > > producing a splitter (charge from charger / data from usb).
> > > Did this ever happen (Phil Harris...did you
> > > resolve the problem this or any other way?)
> > > Is there anything on the market?
> > > Thanks
> > > Peter (whose iPad using wife still mutters.........)
> > >
> > >
> > > At 11:14 11/10/2010, you wrote:
> > > >
> > > >
> > > >Hi Phil
> > > >
> > > >Download this document.
> > > >
> > > ><<http://www.embeddedcomputer.co.uk/iPadCharg
> > eSyncAdaptor.pdf>http://www.embeddedcomputer.co.uk/iPadChargeSyncAdaptor.pdf>http://www.embeddedcomputer.co.uk/iPadChargeSyncAdaptor.pdf
> > > >
> > > >See if either of these will work. I have
> > requested a quote for the PCB's so
> > > >once I get this back I can tell you the cost to make
this.
> > > >
> > > >By the way, another option instead of the
> > PLUG on the BOX, is a short flying
> > > >lead with a cable relief into the box. A bit like the
HUB's you can buy.
> > > >
> > > >
> > > >Cheers,
> > > >Dave.
> > > >
> > > >From:
> > > ><mailto:ukha_d%40yahoogroups.com><mailto:ukha
> > _d%40yahoogroups.com>ukha_d@xxxxxxx
> > > >[mailto:ukha_d@xxxxxxx] On Behalf Of
> > > >Phillip Harris
> > > >Sent: 11 October 2010 00:13
> > > >To:
> > <mailto:ukha_d%40yahoogroups.com><mailto:ukha_d%40yahoogroups.com>ukha_d@xxxxxxx
> > > >Subject: Re: [ukha_d] [OT] iPad query...
> > > >
> > > >
> > > >
> > > >That would work - the only reason I was thinking about
having 2 x Type B
> > > >sockets for power and data in and a single
> > Type A socket for combined power
> > > >and data out was simply so that the unit would be more
"universal" as a
> > > >dangly dongle...
> > > >
> > > >Phil
> > > >
> > > >[Non-text portions of this message have been removed]
> > > >
> > > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>




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