>>> I imagine there's some drop from the onboard power circuitry, which is
>> probably why the requirement of 4.75V is so high.  I think it then gets
>> passed to the USB ports though, so if the power is too low there it could
>> cause problems with devices getting their power from the onboard USB ports
>> (which includes the onboard Ethernet module, which is USB2.0)

> They chose the micro-USB form factor as it virtually guaranteed people
> could only plug in 5V, unlike the coaxial plug on the prototype, and it's
> been chosen as the charging standard by some European body. So you'd think
> they'd take that into account with the charging circuit and make sure it
> could work fine with a drop of 0.3V. But maybe not.

>> But were you plugging your wi-fi device into the USB hub?  That might
>> actually explain the problem.  Have you tried plugging it straight into the
>> Pi instead?  I know with desktop PCs hubs can introduce all sorts of
>> problems due to the way they encapsulate the data of the downstream devices
>> - but as you say, it shouldn't be related to power at least.

> I did try that but had no more success. However, I was talking on Google
> Plus and there is a guy who discovered there are 140mA fuses on the USB
> ports, meaning you can draw that much at most. He bridged the fuse and
> added a larger capacitor and is able to run a USB hard drive off it now. As
> for whether it's a good idea to draw an amp through the power circuitry,
> that's another matter...

> Do you have Google+? It's a good place for these kinds of discussions and
> I'll bet everyone is getting sick of our back-and-forth ;) sing out if
> you're listening, lurkers!

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