HOW TO – Battery Free, USB Powered LED torch

MAKE Flickr photo pool memeber Trialex posted this little (battery free) USB power LED torch, here’s how to make your own… –

A rechargeable, battery-free LED torch which gets it’s power from USB and stores it in a capacitor.

I reckon USB stuff is cool. I also reckon LED stuff is cool. I HATE paying for batteries. I love my shaky torch. Putting all this together, I thought I’d make a LED torch, simmilar in form to those keychain types, which stores it’s power in a capacitor. The capacitor is charged from the USB port.

This is only a “proof of concept”, and is intended to show it works. I doubt it will have the best performace, but that’s not the point. I think I should be able to do it fairly cheaply, for about the cost of a keychain coin-cell LED light


  • Low power LED PVC flashlight – Link.
  • DIY LED Flashlight – Link.
  • LED flashlight from garage door remote – Link.
  • HOW TO – Make a TicTac flashlight – Link.
  • Inkjet cartridge flashlight – Link.
  • HOW TO – Make a windup flashlight – Link.
  • DIY Shake flashlight – Link.

6 thoughts on “HOW TO – Battery Free, USB Powered LED torch

Comments are closed.


current: @adafruit - previous: MAKE, popular science, hackaday, engadget, fallon, braincraft ... howtoons, 2600...

View more articles by Phillip Torrone