mattanl
Posts: 143
Joined: Thu Jun 14, 2012 10:40 am

EU Power supply

Fri Aug 17, 2012 2:52 pm

Hi,

Which power supply should I buy?
How many mA will be the best for the raspi?
Is this model will be good enough?
http://www.dealextreme.com/p/usb-power- ... plug-48615

Can someone explain about the required mA? the greater the better? are there limits?

Thank.

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RaTTuS
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Re: EU Power supply

Fri Aug 17, 2012 3:00 pm

http://elinux.org/RPi_Hardware#Power
that one should be good enough as long as your USB -> micro USB cable is not made of wet sting.
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redhawk
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Re: EU Power supply

Fri Aug 17, 2012 4:30 pm

The PI's polyfuse (F3) will limit it's ability to use anything more than 750ma so even if you use a power supply rated at 5v@2A or 5v@750ma the extra current won't make a difference.
What does matter is the effectiveness of a power supply to keep a steady voltage with respect to current most loaded power supplies will drastically drop their voltage output.
The only way to test this on the PI is to load the board with USB device and then measure the voltage at TP1 / TP2 the PI really needs 4.75v or higher to function correctly.

Richard S.

mattanl
Posts: 143
Joined: Thu Jun 14, 2012 10:40 am

Re: EU Power supply

Fri Aug 17, 2012 7:46 pm

Thanks!
Seems like the model I wrote will be good enough (5V, 1A).
Am I right?

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hibol
Posts: 33
Joined: Thu Jul 26, 2012 9:44 am
Location: Switzerland

Re: EU Power supply

Fri Aug 17, 2012 7:52 pm

It should be ok, but beware of no name and cheap devices.
For this price, I wonder what quality this power supply is.

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