Experimenting with the Joule Thief circuit

Flashlight Modding and DIY Parts
41

On the Joule Thief thing...I found quite a few "projects" the above is the first one I built and got working (I haven't built any of the others yet)

https://oshpark.com/shared_projects/ZR9hPZke

https://oshpark.com/shared_projects/RQ9grSz3

I just like the Alx Smith one because it's built for a battery carrier, small, self contained, kids can build it, and it just works

42

Found this big ol’ 20mm LED

http://dx.com/p/20mm-18000-20000mcd-led-emitter-5v-white-11095
awwww…sold out

Oh and that build ran for almost 2 weeks straight on a single AA