The DITS get younger as time passes. The Joule thief lamp as built by the new pair.

I heard from DIT and she has a pair of twins she assisted in this build. Check it out. Two more DITs.

Working with as little as 0.3 volts it will truly zap the last joule from a battery.

The finished project operating from a single C cell should function for a very long time.

I am so glad to see more designers in training!

Well done ladies.

Edit: The coils are wound bifilar.