switchmode power supply

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Hello! I am making a smps for a tft screen, actually modifying a existing one:smash: A 5 volt winding in a smps transformer is is 4 turns wich gives 1.25 volts per turn, so on 8 volt that would be 6 - 7 turns, with 9 turns the voltage is 13.25 volts. Is these calculations right, can anyone confirm ?
 
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