How to make Joule Thief with Multiple LED and maintaining its brightness.
I know how to build Joule Thief
-NPN 2N3904, 2N2222A, 2N4401 Transistors
-Resistor what I have now 1K, 560, 100..
-Toroid 12 turns and 20 turns
Can anyone tell me what to do to run at least 10 LEDs with good or full brightness?