tawalker
Posts: 182
Joined: Tue Jan 17, 2012 9:02 am
Contact: Website

Recommended USB power supplies?

Mon May 14, 2012 9:12 am

I'm on the lookout for a new USB power supply for my Pi, as the Master Plug USB adapter I've been trying to use, doesn't seem to be able to deliver the juice consistently. I am constantly (and continuously) getting the "repeated keypresses" problem, and it has basically rendered the Pi unusable, as I can't enter anything without missing characters, repeated keypresses, etc.

I've seen a couple of suggestions in the forum, but is there a list of USB power supplies, which users have found will deliver the required power to the Pi (and do it consistently)? If not, perhaps this could be added as a new section to the "verified peripherals" page in the RasPi wiki?

Many thanks :)
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Raspberry Pi Zero W with ZeroStem USB board (2018) ("mass") - Raspbian
Raspberry Pi Model B (1st-gen - 2012) ("ryo-ohki") - Arch Linux ARM
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tawalker
Posts: 182
Joined: Tue Jan 17, 2012 9:02 am
Contact: Website

Re: Recommended USB power supplies?

Mon May 14, 2012 9:19 am

This looks promising - I have a Nokia N8, so I'll see if I can find a genuine Nokia micro-USB charger, and maybe try that?
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Raspberry Pi Zero W with ZeroStem USB board (2018) ("mass") - Raspbian
Raspberry Pi Model B (1st-gen - 2012) ("ryo-ohki") - Arch Linux ARM
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theunit
Posts: 31
Joined: Fri May 11, 2012 7:52 am

Re: Recommended USB power supplies?

Mon May 14, 2012 10:17 am

The main thing to check is the rating of the power supply. The RP needs 700ma. I personally would get a power supply which can deliver at least 1000ma to be sure.

Can you find out the power rating of your keyboard? If it is greater than 140ma then that could be the reason for the repeated key-presses. The Pi can't supply more than 140ma to USB regardless of the rating of the Pi's power supply.

tawalker
Posts: 182
Joined: Tue Jan 17, 2012 9:02 am
Contact: Website

Re: Recommended USB power supplies?

Mon May 14, 2012 10:20 am

The main thing to check is the rating of the power supply. The RP needs 700ma. I personally would get a power supply which can deliver at least 1000ma to be sure.

Can you find out the power rating of your keyboard? If it is greater than 140ma then that could be the reason for the repeated key-presses. The Pi can't supply more than 140ma to USB regardless of the rating of the Pi's power supply.
I'll have a look at both of these later - thanks for the tip :)
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Raspberry Pi Zero W with ZeroStem USB board (2018) ("mass") - Raspbian
Raspberry Pi Model B (1st-gen - 2012) ("ryo-ohki") - Arch Linux ARM
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tufty
Posts: 1456
Joined: Sun Sep 11, 2011 2:32 pm

Re: Recommended USB power supplies?

Mon May 14, 2012 11:33 am

Watch out for mislabelling, though. I've seen a number of twin-output usb chargers labelled as 1000mA, when in fact they put out 2x500mA max (i.e probably won't work), likewise for 4-output, 2000mA, and so on.

The best advice I've seen given is to get something intended for devices like the iPad, preferably OEM (i.e with an actual Apple or equivalent logo on it). This means "spend a significant amount of money"), unfortunately.

Simon

Bigwol
Posts: 22
Joined: Thu Feb 09, 2012 12:22 pm

Re: Recommended USB power supplies?

Mon May 14, 2012 2:51 pm

Excellent value and recommended - Nokia 5V 1200mA - £3.99 delivered from Amazon - rock solid 4.9V at test points

http://www.amazon.co.uk/gp/product/B007W3F6CA

tawalker
Posts: 182
Joined: Tue Jan 17, 2012 9:02 am
Contact: Website

Re: Recommended USB power supplies?

Mon May 14, 2012 2:58 pm

Bigwol wrote:Excellent value and recommended - Nokia 5V 1200mA - £3.99 delivered from Amazon - rock solid 4.9V at test points

http://www.amazon.co.uk/gp/product/B007W3F6CA
Phew, that's a relief - I placed an order for one of these (Nokia AC-10X) at lunchtime :-)

Seriously, though: anyone else think that it would be helpful to add USB power supplies to the "verified peripherals" page of the wiki? [EDIT: I should have looked a bit more closely - there already is a section for power adapters...]
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Raspberry Pi Zero W with ZeroStem USB board (2018) ("mass") - Raspbian
Raspberry Pi Model B (1st-gen - 2012) ("ryo-ohki") - Arch Linux ARM
---

xtramural
Posts: 108
Joined: Thu Dec 29, 2011 11:16 pm
Location: Scotland

Re: Recommended USB power supplies?

Mon May 14, 2012 3:10 pm

Bigwol wrote:Excellent value and recommended - Nokia 5V 1200mA - £3.99 delivered from Amazon - rock solid 4.9V at test points

http://www.amazon.co.uk/gp/product/B007W3F6CA
I ordered same PSU a couple of weeks ago - it was £3.50 at that time but I forget to amend the 'buy now with 1-click' delivery option to super-saver (free) delivery do that added £2.75 to the price. Caveat emptor ;)

jonv
Posts: 24
Joined: Wed Nov 09, 2011 9:02 pm

Re: Recommended USB power supplies?

Mon May 14, 2012 5:57 pm

Bought this: http://uk.rs-online.com/web/p/external- ... s/7263069/
at the same time as the Pi and whilst not the cheapest around has worked fine so far.

max1zzz
Posts: 78
Joined: Thu Jul 28, 2011 6:58 am
Contact: Website

Re: Recommended USB power supplies?

Mon May 14, 2012 6:20 pm

I have been using the 1a apple charger that came with my iPhone with no problems (i'll also note that i connect it to the gpio pins), i have also briefly used a 2a brick that came with my LiteOn dvd drive, which seemed to work fine, but i didn't do any real testing past checking it powers up

gas
Posts: 1
Joined: Thu Jun 14, 2012 7:01 am

Re: Recommended USB power supplies?

Thu Jun 14, 2012 7:07 am

You can get the Nokia power supply (AC-10) on eBay for less that US $3 including shipping.

GAS

therealeasterbunny
Posts: 77
Joined: Thu Feb 02, 2012 5:53 pm
Contact: Website

Re: Recommended USB power supplies?

Thu Jun 14, 2012 4:45 pm

Don't buy unbranded PSUs even from high street "pound shops" or even ebay. (Data cables on the other hand OK, coz if they dont work, it wont break your Pi).

I watched a trading standards TV programme where a kid died using a cheap / bad / fake badged PSU for his gameboy.

And also think of if you pop your Pi, it could be a long wait for RMA return.

I have used a HTC Desire charger with no issues in the past and am now using a Curry's Logik 4 port usb hub which came with a 2A 5v charger and its great.

Also very surprised pricewise because replacement chargers for phones in shops are around £17-£24 but for £12.99 from Currys you can get a 4 port powered hub *with* 2A charger which powers my Pi (via a Y splitter 2x USB 'A' to 1x USB Micro B), PL2303 USB to serial converter, chicony PS/2 keyboard and PS/2 logitech mouse via a USB to 2x PS/2 "EZee" converter.

All runs with no issues.

ahmete60
Posts: 1
Joined: Thu Jan 24, 2013 9:42 am

Re: Recommended USB power supplies?

Thu Jan 24, 2013 10:01 am

I have also purchased a "5V USB Wall Home AC Power Adapter Plug Charger" (ebay title), it is rated 5.0V and 1Amp+-5%. Interestingly it works fine when I use the HDMI console BUT when I try to connect thru the ethernet it does not respond. login times out. I am able to see the unit when I do a IPscan. But I cannot connect via putty or ftp. Everything works fine when I use the USB from my desktop as the power source.

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