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Re: Is this Power Supply Suitable?

Posted: Tue Apr 10, 2012 9:11 am
by gingbeard
I have just ordered a power supply - is this suitable?

Ratings below:

OUTPUT: DC5.2V 500-700MA

Re: Is this Power Supply Suitable?

Posted: Tue Apr 10, 2012 9:19 am
by XAPBob
Barely - assuming of course that it has a MicroUSB output.

700mA can be drawn by the board itself, leaving nothing for any peripherals.

5.2V is just about within USB tolerances.

Re: Is this Power Supply Suitable?

Posted: Tue Apr 10, 2012 10:10 am
by gingbeard
Many thanks.

I have now ordered a Nokia AC-10X charger.

(Output current: 1200 mA)

Sound Better?

Re: Is this Power Supply Suitable?

Posted: Tue Apr 10, 2012 10:25 am
by colin B
Just make sure it has a micro USB connector, not a mini one.

I'm purchasing a 13 port USB hub with 3A power supply and  each port is indiviually switched.

http://www.mbeat.com.au/index

Re: Is this Power Supply Suitable?

Posted: Thu Apr 12, 2012 10:37 pm
by mattig89ch
would this be a suitable Power Supply?

If I read the details right, it should work, but I've never been accused of being overly observant.

http://www.newegg.com/Product/.....75-975-169

Re: Is this Power Supply Suitable?

Posted: Fri Apr 13, 2012 12:15 am
by Vindicator
A name brand charger that has the correct leads for your home and provides 5V 1000ma or 1amp with a micro USB connector should take care of the Raspi's needs, so the supply you linked should work fine I would think.

Re: Is this Power Supply Suitable?

Posted: Fri Apr 13, 2012 6:23 am
by GizmoB73
bodgyuk said:


Just make sure it has a micro USB connector, not a mini one.

I"m purchasing a 13 port USB hub with 3A power supply and  each port is indiviually switched.

http://www.mbeat.com.au/index



Your link gives me a 404 error but I wanted to check something with you.

If you are thinking of powering the Pi from the Hub, that is fine (in fact it is what I do), but you would have to be able to switch off both the output to the Pi's USB Micro, AND the uplink USB input to the hub from the Pi's USB output.

This is because if you switch off the hub port that is connected to the Pi's USB micro power input, it would still draw some power from the other USB lead backfeeding the power.  This will then fail as the fuses on the the Pi will cut out at around 300mA causing the Pi to continually shutdown and partially reboot.

If powering completely from the hub, the easy option is just to pull the hubs PSU when you want to shut down.

Re: Is this Power Supply Suitable?

Posted: Fri Apr 13, 2012 7:29 am
by colin B
Annoyingly they've moved the link - http://www.mbeat.com.au  then look for the 13 port hub.

The hub is intended for dual purposes which is why I went for the switched version. I also intend to possibly use the power supply as a standalone after doing something strange with the USB connector.

The very first thing when I receive the hub will be to attempt to break into it and possibly play around with it's insides.

Re: Is this Power Supply Suitable?

Posted: Fri Apr 13, 2012 8:02 am
by GizmoB73
bodgyuk said:


Annoyingly they've moved the link - http://www.mbeat.com.au  then look for the 13 port hub.

The hub is intended for dual purposes which is why I went for the switched version. I also intend to possibly use the power supply as a standalone after doing something strange with the USB connector.

The very first thing when I receive the hub will be to attempt to break into it and possibly play around with it's insides.



From what I could see the Data Uplink from the Pi to the Hub is not switched on that hub, so if you were powering the Pi from the Hub, you will have to unplug the PSU from the hub to switch the Pi off.

Re: Is this Power Supply Suitable?

Posted: Fri Apr 20, 2012 10:03 am
by gingbeard
Sorry to reopen this one - My new charger has arrived, and outputs 5.2V. Is this still OK for the Rpi?

Re: Is this Power Supply Suitable?

Posted: Fri Apr 20, 2012 10:11 am
by colin B
gingbeard said:


My new charger has arrived, and outputs 5.2V. Is this still OK for the Rpi?


Yes it is, the polyfuse (according to the schematic) is rated at 6v so allowing for a margin of safety I'd not want to go higher than 5v25.

Re: Is this Power Supply Suitable?

Posted: Tue May 01, 2012 9:51 am
by gingbeard
Thanks for that.

At the end of the day - I want to follow the exact Rpi guidelines. (I'm a bit OCD like that)

I ordered

http://www.ebay.co.uk/itm/330717731492

in the end. 5V 1000mA - Now I can sleep at night

Re: Is this Power Supply Suitable?

Posted: Tue May 01, 2012 10:29 am
by rurwin
bodgyuk said:


gingbeard said:


My new charger has arrived, and outputs 5.2V. Is this still OK for the Rpi?


Yes it is, the polyfuse (according to the schematic) is rated at 6v so allowing for a margin of safety I'd not want to go higher than 5v25.



The polyfuse ratings are not important. The 5V is used for some of the circuitry on the board and also for the USB ports. The voltage specification for TTL logic and USB2 is 4.75-5.25 volts.

5.2V is fine. In fact at least some of that will be lost in the cable.