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Some timeyou have 12v battery and you make a project it need more than 12V so you can convert 12v to any voltage you needFor this circuit you need

1- Transformer

2- Two Power MOSFET

3- Pwm controller (TL494)

4- some resistors and capacitors

Step 1: Circuit

Step 3: You Can See This Video It Help Your Circuit Step by Step

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