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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?

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  • in reply to wallarug

    Thanks for pointing this out, but the raspberry pi blog post was about fake apple power supplies. What I am discussing is entirely different: The power supply proposed by farnell in its "raspberry pi accessories" page is severely out of spec - in fact it is totally inadequate for the pi. I am slightly amazed that nobody has reported that yet - there is an ever so slight possibility that the specific PSU I tried was defective. I could check this by testing the second one I bought, but as I intend to return them in case they are both defective, I am hesitating to do it. I 'll wait a few days in case someone from Farnell / Element14 sees this and comments, then I 'll try to contact them directly.