Off-Topic > Off-Topic - Tiny Core Lounge
Raspberry Pi
bmarkus:
A phone charger is not a power supply.
netnomad:
i tried two different power supplies...
both are phone chargers:
the first one, a new cheap manufactured chinese product with 700ma i bought on a flee-market for 2 euros and my raspberrypi suffered various malfunctions.
afterwards i bought a new phone-charger with 1000ma for 12 euros and everythings works flawless.
spence91:
Official Blackberry chargers are rated 5V 700ma and are *cheap*, plus my work seems to throw one at me every couple of years. That's what I've been using and I've not had any issues - even having 2 devices in both usb ports and using XBMC playing stuff over NFS.
--- Quote from: bmarkus on August 06, 2012, 04:16:38 PM ---A phone charger is not a power supply.
--- End quote ---
Supplying power to an electrical load - what else can it be?
bmarkus:
--- Quote from: spence91 on August 07, 2012, 04:36:44 AM ---Supplying power to an electrical load - what else can it be?
--- End quote ---
A charger is providing power to charge a mobile phone battery where charging is regulated by the phone's electronic and phone itself is powered from the battery having a regulator, filter circuit between battery and and phone. It means, that requirement on stability, noise, etc. is low on charger, it can be a cheap shit.
Powering a cumputer board is a different story, where requirement on voltage stability and noise level on the lines are much higher to protect the board, as well as for example how voltage is changing during on/off can be important for reset circuit, etc. Do not know how Pi, wether there is a voltage stab for example in its power line or line, how reset circuit is built, etc.
Low quality power supply can cause strange system crashes and mulfunctions which would handled as software bug or a hardware failure of the board by most users but it isn't.
So even if you find a phone charger working it is a high risk for your board.
spence91:
--- Quote from: bmarkus on August 07, 2012, 07:40:50 AM ---A charger is providing power
--- End quote ---
Bingo.
http://elinux.org/Rpi_Hardware#Power
According to the online wiki the Pi can take voltages anywhere from 5V to 16V, I think the whole point of deciding on this method of power supply was precisely because many people have mini-usb power supplies at home already because it's become ubiquitous.
I agree with the non-brand phone chargers not being good, I disagree with it being a high risk to your board, most people have issues with too little power not the other way around. It will result in strange failures but will it blow up in your face? I doubt it.
My point is that you can get branded power supplies for very cheap, and most people already have some lying around.
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