Weekend Projects - Solar Joule Bracelet

Complete instructions for this Weekend Projects can be found at

The Solar Joule Bracelet combines two separate projects, a solar battery and a "joule thief," to build a wearable circuit that powers an LED. Solar energy flows through the photodiodes, building up a supercapacitor, which essentially acts like a battery. This energy is then delivered to the joule thief, where oscillations eventually exceed the LED's forward voltage, making it light up. Once fully charged, these oscillations will occur so fast that the LED will appear continuously bright, visible even during daytime!

Best of all, this circuit's design allows you to install it where and how you wish!

[siouxsettewerks]

AH!
Finally!
Videos that are thought out and instructive!
It's a nice change from the last two month crappy videos that explained little to nihil on the properties involved in the circuits, and the circuit themselves!

Back to normal, I hope!

[ConradBianco]

I love how this episode shows how you do the actual wiring. I think a trip to the store is coming soon.

[GhStSecurity]

the interesting stuff are coming back finally

[PrimalEdge]

awesome idea. I love the 'weekend projects'

[Ljudgenerator]

Finally a cool weekend project! Keep making more lite this one! :)

[sidraket]

Good job! This is how these should be, you can just watch the video and know how to do it, and its interesting even if you dont want to do it because you can take parts of it and use them for something else.

[Javiermn]

this is one of my favourite vids from you guys!

[Gamersnewscom]

Congratulations you made a light that doesn't work in the dark.

[bobman]

Hi there! great weekend project.
Can you tell me what software did you use to edit this videos?

Thanks and keep the good work! :D

[beardguy]

mini blinking leds are great for this project, Thanks for the idea.
"ALSO"... like the background music is perfect for my office ., did you have the track name?
thanks

[Stetofire]

If you can charge a battery with this, it might be useful, but other than for looks, why do you need an LED in the daytime with sunlight?

[Gwe_youtube]

Electrons go from minus to plus, but in electronics/physics it's been determined that electricity goes from + to -. Technically, you are right, but everything has been developed so it works like this

[TheGamingMackV]

why use that if you could just use the sun for light?

[acmefixer]

The JT is limited in what it can do. It's simple, and to make it work on a larger scale would take much more complexity, especially when dealing with higher voltages.

[TheThirdMusic]

Because it doesn't create extra energy just stores, small amount of energy until they are large enough to use.

[Stijn_DC]

What is the voltage output of the sollar battery?
i also would like to know if it's possible to light several LED's so i can install/mount it on a bicycle (even if it means having to make the solar battery a little stronger)

[klj]

just use a blinking diode instead of a regular diode - you can buy them like that, you can even buy them blinking and changing colour at the same time they hook up the same way as regular diodes - you can buy them on Ebay for a $ or 2

[klj]

Actually the photo diode does not act like a diode more like a photo detector - infact the specifik component here is just small pieces of solar cell in tiny plastic house it does not rectify or block anything - think of them like small batteries instead - thats much better.
The specifik component is produced by a company called Vishay and the component id is: BPW34 - you should order the one without daylight filter... for this kind of project

[BlitzNeko]

we do... However batteries/capacitors that size are very expensive and dangerous

[themakingofstuff]

yes i actually have a circuit for that using a 555 timer