Joule thief hp charger

@edooy

11 years ago

https://everycircuit.com/circuit/5137758026727424

Input: 3.7volt 4400mAH output: 5.22volt 613mAH Q: TIP 41/D 313/2N3055/TIP 3055 Zener: 5.1volt Trafo: toroid hand wound