Thief is a device designed for two purposes:
1) To suck any and
all traces of juice from your "dead" batteries
2) To make it possible
for an LED with a voltage requirement of higher than 1.5 volts to run
off of a single 1.5 (or less) volt battery! For example, run a white LED
from a single AA battery!
There are other circuits
out, for example, some are more efficient (but have many parts and are
very expensive. Others that have a fewer parts, but are not very efficient
This circuit was built
to be a perfect balance of both worlds. Efficiency is around 70% with
only 7 parts.
You can order the
kit here: Joule