Joule Thief Artbots
A popular circuit for electronic hobbyists called a "Joule Thief"
has been making the rounds on the Internet.
When your batteries go dead, there is still energy or "joules" still
left in that battery. Instead of simply tossing
it out to get recycled,
why not squeeze out the remaning joules of life to do something useful.
the Joule Thief circuit you can light a white led till the battery is
down to .2 volts. Use it for a night light, it will run for days.
when it is good and dead, give it to the trash collector to get
A simple enough circuit that can be modified to do different things.
You can take
apart a CFL energy saving bulb to get the ferrite core.
Q1 can be subsituted with a Supertex TN0702N3-G mosfet from Mouser.
Joule Thief Artbots I have made
side of the Force
blog about My JTs
Instructable on using a JT to charge another battery
Links to others who have built Joule
Mad Scientist Laboratories
The Family of Joule Thiefs
To the rest of Bill's Artbots