Here's an interesting Video on Picking the "Best Power Supply" for the Raspberry Pi. The Raspberry Pi, is an inexpensive ($25 to $35) Computer for Learning and Experimenting with Programming. All on a Credit Card Sized Circuit Board. I'm getting ready to Order a Raspberry Pi for my self. But, they don't come with a Power Supply. I originally thought that I would be able to use one of the several Standard 5 volt or Adjustable Power Supplies that I already have. But, the Raspberry Pi, uses a Micro USB-B Connector. Not the Usual Barrel Type of connector that has been used on Electronics for the Last 30 Plus Years. The Raspberry-Pi-Schematics-R1.0.pdf. Just says, "USB Power Input 5V 700mA min". No mention of Maximum. And the Maximum input voltage and Amperage Rating, is something we need to know. If we are to have to source our own Power Supplies. I've found a bunch of 5V 1A Power Supplies that are claimed to work with the Raspberry Pi. But, during my Searches for the Best Power Supply, at the Best Price. I noticed allot of People Commenting on the Problems they were having with 5 volt, 1 amp Power Supplies. The Voltages drops, when they Plug in a few USB Devices and the Pi Begins to Malfunction. I have found nothing official from the Raspberry Pi Foundation. But, it looks like there is still, No Definite Answer for the Raspberry Pi. Here's what most of what I have read, comes down to...

"I've been using the Adafruit power supply he shows. Interestingly, it is designed to output 5.25V:

This adapter was specifically designed to provide 5.25V not 5V, but we still call it a 5V USB adapter. We did this on purpose to solve a problem that occurs often with USB-powered gadgets: they draw so much current than the resistance of the cable causes a voltage drop, so instead of 5V, the device sees 4.75V or so. To avoid this problem, we made the adapter 5.25V. This is because the USB power specification allows up to 5.25V, and its safe for all 5V electronics, and has the benefit of making up for any loss due to thin USB cables. Basically, you can use it where ever USB 5V power is needed, with no risk of damage, and it will happily work at the full current range, no matter what cable you use!

Is there any downside to having a USB power supply output 5.25V? If it's within USB spec, then I wonder why all supplies without a built-in cable don't do this.

Cheers,

Drew"

I've been searching on this, for 3 days now. I don't think I want a Power Supply that needs a Separate USB to Micro USB-B Cable, though. It may slip out, when you least expect it. And you will be left wondering what happened. One Micro USB Connection, is enough for me to deal with. So, I'm leaning towards one of the Power Supplies, that have a built in Micro USB Cable, that is long enough for my purposes. Also, I've read that they usually have heaver gauge wire in them and can carry more currant - amperage. Than the USB-A to Micro USB-B Cables (as a general rule). Today, I setup my own Custom Google Search, to help me find Electronics and Parts faster. I put in about 85 Electronics Sites that I have found in it. And it seemed to Speed up my Search, giving me more related Results. And at Online Stores that I have found interesting, in the Past. Weeding out all of the extra sites, that usually come up in my Google Searches. Try it out if you like, Don's Electronics and Parts Search (https://www.google.com/cse/publicurl?cx=000998905616149849377:zoir97hnuqg). Use the Search Window, below the Words, Don's Electronics and Parts ... Not the Window Labeled Google, at the Top...

Check out the Video from the above info and the Links below too...

Don

Best Power Supply for the Raspberry Pi

by ·17 videos

Video Link...
http://www.youtube.com/watch?v=XX3kiRUf7mg

Published on May 26, 2012

Hey Guys! Today I will be talking about the best Power Adapter for the Raspberry Pi. Please do not forget to Subscribe and Like this video! Thank you very much!

Here is the link to the Power Adapter I bought: https://www.adafruit.com/products/501

Here is the link to the A to micro-B USB cable I bought: https://www.adafruit.com/products/592

Rubber Feet: https://www.adafruit.com/products/550