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Farnell power adaptor for the Pi

e14 Contributor

*** EDIT ***

 

In this message, I implied that the PSU supplied by Farnell is inadequate, out of spec etc. it turns out that THIS IS NOT THE CASE - the Farnell PSU apparently works just fine. If you are interested in the details (or if you have similar problems, either with the Farnell PSU or with others) please read on. The short story is, it seems that USB type A -> Micro USB cables are usually the culprits, so check this before discarding/blaming your PSU.

 

*** EDIT ***

 

I was wondering if anyone has used the Farnell "ADAPTOR, USB TO EURO, WHITE " (the last item in page http://export.farnell.com/jsp/bespoke/bespoke7.jsp?bespokepage=farnell/en_UK/promotions/rasp-pi-accessories.jsp - interestingly enough, clicking on the link leads to a page about an unrelated product, but clicking on "buy" from the first page mentioned adds the adaptor to the cart).

 

I got two such adaptors and tried one of them. Tha voltage between tp1 and tp2 on my Pi, after it boots, is 3,88V - way below the nominal 5V. As is to be expected, the Pi is not very stable with this supply. In contrast, using the PSU recommended by another distributor, I get 4.90V and the Pi works like a charm.

 

- Is this a known problem?

- What is the procedure for returning the two PSUs?

Parents

  • It appears that CPC (part of Farnell) are recalling one of their recommended ones:

    http://www.raspberrypi.org/phpBB3/viewtopic.php?f=22&t=19020

     

    Can't tell if that's the same as yours as the links you posted re-direct to the export 'choose your country' page, when I extract the 2210244 part number from your link and do a search I get a molex crimp terminal instead, and the CPC part number mentioned in that thread no longer exists..

     

    Interesting to see issues with crap usb chargers finally getting some exposure though.

     

    John is absolutely right on the cable though. I bought a supposedly decent one from farnell earlier this year and there's 0.5v or more drop at 400mA, and none of the other cables I could find were much better.

Reply

  • It appears that CPC (part of Farnell) are recalling one of their recommended ones:

    http://www.raspberrypi.org/phpBB3/viewtopic.php?f=22&t=19020

     

    Can't tell if that's the same as yours as the links you posted re-direct to the export 'choose your country' page, when I extract the 2210244 part number from your link and do a search I get a molex crimp terminal instead, and the CPC part number mentioned in that thread no longer exists..

     

    Interesting to see issues with crap usb chargers finally getting some exposure though.

     

    John is absolutely right on the cable though. I bought a supposedly decent one from farnell earlier this year and there's 0.5v or more drop at 400mA, and none of the other cables I could find were much better.

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