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USB Charger/Power Supply

 
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Reverend Jones
HG Contributor


Joined: 15 Aug 2007
Posts: 39
Location: Jonestown, Guyana

PostPosted: Wed Aug 15, 2007 1:07 pm    Post subject: USB Charger/Power Supply Reply with quote

Here is a quick and easy way to make an USB charger/power supply powered by the wall outlet. This can be used to charge/power a PSP, iPod or any other USB device.
First you need to acquire a regulated 5 vdc wallwart rated at 500ma or higher. The one I used is from an IoMega Zip drive. It has a switching regulator with an output of 5vdc @ 1amp.

Other parts needed:

1) 330 ohm 1/4 watt resister
1) 10k ohm 1/4 watt resister
1) 3mm LED (red, green or yellow)
1) USB-A jack, female

Pics of the IoMega wallwart



The case is held together by a drop of glue in each corner. Prying gently with a small screwdriver removes the top.



A pic of all the parts.



And a schematic for the parts we will be adding to the wallwart.



Pin 1 is bent over and soldered to the case of the jack. The case of the jack is then connected to the wallwart ground.
Pins 2 & 3 are connected together then soldered to one end of the 10k ohm resister. The other end of the 10k ohm resister is connected to +5vdc.
Pin 4 is connected to +5vdc. One end of the 330 ohm resister is also connected to +5vdc. The other end connects to the anode of the LED. The cathode of the LED is grounded.
The 10k ohm resister is used to pull the USB data lines high. Some devices require these lines to be at +5vdc before initiating charging.
The LED functions as a power indicator and supplies the switching regulator with a minimum load.



The hole that the power cable came out of is enlarged for the USB jack and a 3mm hole is drilled for the LED.



The USB jack and LED fit snuggly in their holes when the case is closed but I have added some epoxy to make sure they stay put.



The unit with its LED lit.



And powering sound-sensitive USB lights.



USB Wall Wart Charger/Power Supply
Edit: Fixed broken picture links.


Last edited by Reverend Jones on Tue Dec 25, 2007 11:04 pm; edited 2 times in total
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Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Wed Aug 22, 2007 4:58 pm    Post subject: Reply with quote

Great use of something that most people would toss in the trash. Smile It's sad how much useful stuff finds it's way into the landfill.
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Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Thu Aug 23, 2007 9:36 pm    Post subject: Reply with quote

http://www.makezine.com/blog/archive/2007/08/make_a_usb_powercharger_f.html

Smile
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Turd
HG Ruler


Joined: 18 Aug 2007
Posts: 274
Location: Saskatchewan, Canada

PostPosted: Thu Aug 23, 2007 10:12 pm    Post subject: Reply with quote

Looks like your hack is getting popular. Good work Very Happy



eric
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nzo
Newbie


Joined: 19 Aug 2011
Posts: 1
Location: New Zealand

PostPosted: Fri Aug 19, 2011 9:14 pm    Post subject: Reply with quote

Huge thanks for this simple hack Reverend!

I had all but forgotten I was once an Iomega user and still have the drive and its 1amp power supply. I imagine the case shells are glued together, like the one you feature here.
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