Joule thief

Joule thief or not joule thief that is the question

A joule thief is a minimalist Armstrong self-oscillating voltage booster that is small, low-cost, and easy to build; typically used for driving light loads. It can use nearly all of the energy in a single-cell electric battery, even far below the voltage where other circuits consider the battery fully discharged (or “dead”). Hence the name, […]