I admit it: I'm a total geek. I love electronics, programming, 3D art, vintage Apple hardware, and whisky. I'm always juggling half a dozen projects. I also enjoy documenting it all: my successes, my failures, my experiences... and everything geeky along the way.

Seeed Studio Fusion - $9.90 for 10pcs 2 layer 10x10cm boards


 
 
 
 
 

DIY USB Charger | Kevin Rye.net - Main

Kevin Rye

Geek Extraordinaire. Yeh, I said it.

DIY USB Charger

I needed a pocket sized iPod charger. You know, in case of an emergency. First I started with a proof of concept. I connected a 9V battery to a 5V regulator. I cut out a USB socket from a computer PCI card that I had.

charger4

Finally, I mounted it in a project box from Radio Shack. Works like a charm.

radio_shack enclosure_charger2

radio_shack enclosure_charger1

It works!

charger3

I then decided to try the Altoids Tin charger that everyone on the Internet is raving about. I found a cool circuit that was basically the same as mine, but included a current regulator to keep the output at less that 1 Amp.

charger-schematic

I managed to squeeze the whole circuit into an Altoids tin with enough room for a 9V battery. There’s no board. All the components are just soldered together at the leads. They are separated by hot glue so that nothing causes a short.

altoids_tin_charger3

altoids_tin_charger2

I even added an on/off switch as well as a LED to indicate the battery level. As the battery drains, the LED will dim. Crude, but effective.

altoids_tin_charger1

I know you can buy these charger at any electronics store. I’ve seen the 9V versions go as much as $20. Not to mention the 40+ hour jobs that are in the $60 range. It’s not about being cheap. It’s about Doing It Yourself!