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Maybe you could draw a schematic. It's not clear there are 2 windings on the bolt and which goes where or how many turns.
The voltage is increased by using an inductor and a switching circuit.HOW we can light 8 leds in series with just 9V supply?
Put two leds in series with a 150 ohm resistor and four of these parallel.
How this circuit work.The voltage is increased by using an inductor and a switching circuit.
https://en.wikipedia.org/wiki/Joule_thief#Description_of_operationHow this circuit work.