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Next: Help converting simple schematic to 110v
From: Paul Hovnanian P.E. on 26 Jun 2010 00:34
Dirk Bruere at NeoPax wrote:
>
> I'm looking for a mains/USB PSU and am thinking of just buying a mobile
> phone charger. However, I can't find a lot of detail about MTBF. Has
> anyone any info on popular models? I'm currently using the one I got
> with my Motorola Razr - quite neat.

Do some research on chargers compatibility with your particular
phone/camera/iPod. Some brands (like Apple) are pretty finicky about
which adapters they'll charge from. It has to do with their particular
implementation of the USB standard (or some proprietary offshoot of it).

--
Paul Hovnanian mailto:Paul(a)Hovnanian.com
------------------------------------------------------------------
Life would be so much easier if we could just look at the source code.
From: Dirk Bruere at NeoPax on 26 Jun 2010 12:20
On 26/06/2010 05:34, Paul Hovnanian P.E. wrote:
> Dirk Bruere at NeoPax wrote:
>>
>> I'm looking for a mains/USB PSU and am thinking of just buying a mobile
>> phone charger. However, I can't find a lot of detail about MTBF. Has
>> anyone any info on popular models? I'm currently using the one I got
>> with my Motorola Razr - quite neat.
>
> Do some research on chargers compatibility with your particular
> phone/camera/iPod. Some brands (like Apple) are pretty finicky about
> which adapters they'll charge from. It has to do with their particular
> implementation of the USB standard (or some proprietary offshoot of it).

I am rapidly coming to the conclusion I will have to pay around $20 for
a mains switching PSU module, eg;
http://www.maplin.co.uk/Module.aspx?ModuleNo=227631

--
Dirk

http://www.transcendence.me.uk/ - Transcendence UK
http://www.blogtalkradio.com/onetribe - Occult Talk Show
From: E on 27 Jun 2010 02:44

"Dirk Bruere at NeoPax" <dirk.bruere(a)gmail.com> kirjoitti
viestiss�:88k24dFtnnU1(a)mid.individual.net...
> I'm looking for a mains/USB PSU and am thinking of just buying a mobile
> phone charger. However, I can't find a lot of detail about MTBF. Has
> anyone any info on popular models? I'm currently using the one I got with
> my Motorola Razr - quite neat.
>

Friwo datasheet says 200 000 hours at max load 25C ambient.

List of mobile phone charger manufacturers:
Friwo www.friwo.de
Salcomp www.salcomp.com
Byd
Astec

-ek


From: Dirk Bruere at NeoPax on 27 Jun 2010 07:03
On 27/06/2010 07:44, E wrote:
> "Dirk Bruere at NeoPax"<dirk.bruere(a)gmail.com> kirjoitti
> viestiss�:88k24dFtnnU1(a)mid.individual.net...
>> I'm looking for a mains/USB PSU and am thinking of just buying a mobile
>> phone charger. However, I can't find a lot of detail about MTBF. Has
>> anyone any info on popular models? I'm currently using the one I got with
>> my Motorola Razr - quite neat.
>>
>
> Friwo datasheet says 200 000 hours at max load 25C ambient.
>
> List of mobile phone charger manufacturers:
> Friwo www.friwo.de
> Salcomp www.salcomp.com
> Byd
> Astec
>
> -ek
>
>

Thanks.

--
Dirk

http://www.transcendence.me.uk/ - Transcendence UK
http://www.blogtalkradio.com/onetribe - Occult Talk Show
From: John Walliker on 27 Jun 2010 18:27
> Be advised that some of these devices appear to have some
> smarts/logic in them.  E.g., some Motogorilla products wouldn't
> "recognize" generic 5V USB power sources (perhaps the device
> talks to the charger?)

The older Motorola mini-USB and micro-USB phones look for a 200k
resistor to ground on the sense pin. If they can't find this and
can't negotiate successfully with a host computer to get permission to
draw power - they don't.

Apple devices used to look for particular voltages on the D+ and D-
pins of the USB socket. These were set with a pair of resistors on
each pin.

Newer micro-USB phones follow the recently revised USB standard and
look for a short between D+ and D-. If they detect this they assume
they are connected to a charger. Otherwise they try and negotiate
with a host computer for permission to take power.

The mini-USB connector is obsolete, so if you have a choice it would
be better to use micro-USB in your product.

John
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