is 0.4A sufficient for charging?

W.Kenworthy billk at
Tue Jun 23 08:17:43 CEST 2009

What is the "power_center tool" ?  Is it an application, part of a
distro, ...


On Tue, 2009-06-23 at 08:09 +0200, Alexander Lehner wrote:
> On Tue, 23 Jun 2009, ivvmm wrote:
> > going to buy a device from a local store that will convert alternating
> > current from my bicycle's front hub dynamo to 5V 0.4A. Is that
> > sufficient for charging my Neo?
> I have soldered such a device by myself and it works. I think the phone 
> needs only a little more than 120mA for charging, depending on which 
> features are powered on (GSM, Bluetooth, WiFI, GPS etc).
> The main problem that I see is, that the FR will not recognize the load it 
> may pull from the USB line if you don't put that magic resistor between 
> the Id and GND pin of the  USB plug.
> You can also use the power_center tool to force a charge of 500mA, but I 
> believe it falls back to 100mA as soon as the power supply drops (what 
> will happen if you stop bycicling). So a battery-buffered solution would 
> be preferable.
> BTW: Could you please send a link to the shop where you found this DC 
> converter?
> Alex.
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