Joule-Thief der "Energie-Dieb"

For those who have never heard the term, make it easy for me here and quote Wikipedia :
“As Joule thief (German Joule-thief or energy thief) refers to a discrete electronic circuit in electronics, the electrical DC voltage in a higher electrical The name Joule thief is a Kalauer of the English expression jewel thief (German jewel thief) and is intended to make clear that the circuit squeezes out the (“steals”) from a battery that is already unusable for other purposes the name Joule stands for the name of the unit of energy.”“