> Anyone know of a place to source these ? - The kind reqd. for external
> 2.5" HD enclosures, USB hubs etc. Would be rated about 2 - 2.5A, with a
> miniature DC barrel connector (this seems to be something of a
> quasi-standard for 5V computer devices).

> Martin Slaney wrote:

>> Anyone know of a place to source these ? - The kind reqd. for external
>> 2.5" HD enclosures, USB hubs etc. Would be rated about 2 - 2.5A, with
>> a miniature DC barrel connector (this seems to be something of a
>> quasi-standard for 5V computer devices).

>
> Oh yeah ... just dug up my specs and a vernier ... diameter of the DC
> barrel looks to be about 3.5mm.

>Anyone know of a place to source these ? - The kind reqd. for external
>2.5" HD enclosures, USB hubs etc. Would be rated about 2 - 2.5A, with a
>miniature DC barrel connector (this seems to be something of a
>quasi-standard for 5V computer devices). Generally "wall-wart" form
>factor, switch-mode things.

> Anyone know of a place to source these ? - The kind reqd. for external
> 2.5" HD enclosures, USB hubs etc. Would be rated about 2 - 2.5A, with a
> miniature DC barrel connector (this seems to be something of a
> quasi-standard for 5V computer devices). Generally "wall-wart" form
> factor, switch-mode things.
>
> [Gripe with suppliers]
>
> I was looking around a couple of suppliers for powered (active) USB hubs
> - none of the feckin listings state clearly whether a PSU is included
> ... grrrr ....

> Martin Slaney wrote:

>> Anyone know of a place to source these ? - The kind reqd. for external
>> 2.5" HD enclosures, USB hubs etc. Would be rated about 2 - 2.5A, with
>> a miniature DC barrel connector (this seems to be something of a
>> quasi-standard for 5V computer devices). Generally "wall-wart" form
>> factor, switch-mode things.
>>
>> [Gripe with suppliers]
>>
>> I was looking around a couple of suppliers for powered (active) USB
>> hubs - none of the feckin listings state clearly whether a PSU is
>> included ... grrrr ....

> I have three Lenovo 5v jobs going for beer money

> Just pick any of the Hong Kong Ebay electronic bits sellers and ask for
> a quote for the number and the spec that you want. I did that for a load
> of USB power "wall warts", rated at 5v 1A (the type with a built-in USB
> socket). They came in at under 1GBP each, IIRC.

> They had quite an interesting SMPSU design - which I found out when I
> opened a DOA one. As that one had a resistor that had been clearly
> broken during the case assembly, they clearly don't test them following
> prior to shipping.

> In message aioe.org>, Martin Slaney
> hotmailBEGONE.com> writes

>> Anyone know of a place to source these ? - The kind reqd. for external
>> 2.5" HD enclosures, USB hubs etc. Would be rated about 2 - 2.5A, with
>> a miniature DC barrel connector (this seems to be something of a
>> quasi-standard for 5V computer devices). Generally "wall-wart" form
>> factor, switch-mode things.

>
> All of the powered hubs I've ever seen have been supplied with
> power-supplies. These days you will find that most mobile phone
> chargers deliver 5v at about 1A which is probably sufficient for most
> purposes. If you need another PSU then you are pretty certain to be able
> to get whatever you want at Maplins, but it will be more expensive than ...

> Kevin wrote:

>> Martin Slaney wrote:

>>> Anyone know of a place to source these ? - The kind reqd. for
>>> external 2.5" HD enclosures, USB hubs etc. Would be rated about 2 -
>>> 2.5A, with a miniature DC barrel connector (this seems to be
>>> something of a quasi-standard for 5V computer devices). Generally
>>> "wall-wart" form factor, switch-mode things.
>>>
>>> [Gripe with suppliers]
>>>
>>> I was looking around a couple of suppliers for powered (active) USB
>>> hubs - none of the feckin listings state clearly whether a PSU is
>>> included ... grrrr ....

>

>> I have three Lenovo 5v jobs going for beer money

>
> Yeah ? ... but what current rating, and what connector ?

> Palindrome wrote:
>

>> Just pick any of the Hong Kong Ebay electronic bits sellers and ask
>> for a quote for the number and the spec that you want. I did that for
>> a load of USB power "wall warts", rated at 5v 1A (the type with a
>> built-in USB socket). They came in at under 1GBP each, IIRC.

>
> Can't see em being too interested when I say 1, maybe 2 ;-)

> 50,000 ... maybe :-)
>
> Common sense tells me that a n-port USB will want/expect a n/2 + a bit -
> rated PSU (assuming USB spec of 500mA power/port) so a 4-port hub would
> want 2-and-a-bit amps. Does this sound reasonable ?