[ale] OT: Charging smart phones

[Matt Hessel]

Most of the newer phones pull higher current and the chargers grow to match.

I have chargers to miniusb that can't handle enough for my phone.

I found that you need to check the sticker on the charger for the
amperage.  Most are around 500 mA or half an amp.  Newer chargers can go
from 750mA to 2amps.

The car charger for my dual core phone is 750mA.

The kindle fire charger i have at home is 2.2 amps.  That charges up my
phone in half the time.

Fyi.  Normal usb 2 ports supply 500mA  the usb 3 spec takes it to 2 or 3
amps.
On Oct 24, 2012 4:56 PM, "Chris Fowler" <cfowler at outpostsentinel.com> wrote:

> Anyone here putz with trying to figure out charging current of their
> phone?  I have a HTC Thunderbolt and I've been trying to figure out how
> to get it to charge the fastest.
>
> I purchased a 3" USB A -> micro cable off eBay to use in my car so that
> I can keep the phone in the console for WAZE.  I got tired of coiling up
> a cable.  I purchased a 12v -> 5v USB converter off eBay.  This is in a
> sealed enclosure and can provide 5V up to 3A.  With the short cable and
> that device my TB will charge at almost 800mAh.  I then switched to a
> cable that is 3' and came with 'HTC' wall chargers I got off eBay.  The
> phone drops to above 100mAh.  With the cable A I get 'AC Plugged'.  With
> cable B I get 'USB Plugged'.
>
> I have read up on USB DCP and what had to be implemented in Minty boost.
>   I have not checked the USB output of this device to see if I have 2.8v
> on D- and 2.0v on D+.  It could be that I do, but the thin gauge wire in
> the longer cable could be forcing the TB to think it is attached to a PC.
>
> I would like to make a small 5V to USB adapter that will take any 5V
> input and make the device think it is a charging device.  Need 75K
> resistors and 49.9k ones.  Anyone have any? Anyone mess with the USB DCP
> to charge their devices?
>
> Chris
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