15 years and the joule thief laser is still running good, third battery and now needs a new housing but still up and running on low voltage. : r/electronics
Wind turbine Savonious Charger based on Joule Thief - advise for a charger? - General Electronics - Arduino Forum
Joule Thief Steals Power For A Clock | Hackaday
Joule thief - Wikipedia
Joule Thief Battery Charger - YouTube
Joule Thief 0 6 PDF | PDF | Inductor | Electronic Circuits