🚀 go-pugleaf

On Fri, 9 Mar 2012 19:41:49 -0000, Paul <paul@pcserviceselectronics.co.uk>
wrote:

>In article <4f5a0371.3990093843@news.kpn.nl>, nico@puntnl.niks says...
>> 
>> Paul <paul@pcserviceselectronics.co.uk> wrote:
>> 
>> >In article <4f597914$1@dnews.tpgi.com.au>, keith@nowhere.com.au says...
>> >> 
>> >> On 9/03/2012 8:54 AM, Paul wrote:
>> >> > In article<4f59230c$1@dnews.tpgi.com.au>, keith@nowhere.com.au says...
>> >> >>
>> >> >> On 9/03/2012 3:00 AM, Paul wrote:
>> >> >>> In article<9rqf87FadnU1@mid.individual.net>, 5V@2.5A says...
>> >> >>>>
>> >> >>>> On 08-Mar-12 11:51 AM, Nico Coesel wrote:
>> >> >>>>> Don McKenzie<5V@2.5A>    wrote:
>> >> >>>>>
>> >> >>>>>> On 08-Mar-12 10:23 AM, Paul wrote:
>> >> >>>>>>
>> >> 
>> >> Most USB wall warts are of the universal voltage type, you just buy a 
>> >> cheap adaptor. I even have one that came with slip in connectors that 
>> >> cover 90% of the power sockets in use in the world.
>> >
>> >Reality is especially in classrooms budgets are tight so 20 to 30 of 
>> >these is not prctical causes problems of time wasted, making sure all
>> >bits are together at beginning and returned at end of class, let alone
>> >whose got a dodgy one to debug.
>> 
>> Thats true. I don't think the RP is very suitable for use in a
>> classroom. Its too fragile.
>> 
>> >How many wall warts and the USB cables are speced for 5V @ 700mA.
>> 
>> How many are not? Most are rated 1A and 2A is on its way.
>
>The mahority of USB wall warts people have are for phones in the 100 to
>3000mA range to keep costs and weight down.

100mA would never charge a phone.  3000mA is much better.  AFAIK, they try to
charge the phone at 1C.

>USB Wall warts initially inteneded for particular pseudo USB devices
>can be anything and most rely on being able to grab 100mA easily
>from any USB port, so the wall wart replicates that.