A silicon steel sheet and enameled wire and homemade booster?
Do it yourself. I like it better. Give you a theoretical proposal and do it well. Let me know1, it is necessary to know your battery rated current, such as I, then the booster capacity is 12*I2, the iron core cross section is equal to: (12*I/2/1000) ^0.25*53 ---- theory diameter(theoretical diameter /2) ^2*3.14 /100 equal to the cross sectional area of iron core
The turn potential is equal to 1.75*. The cross section of the iron core is /45 12/ (1.7* core section /45), and the close turns are the low voltage turns
Gauge choice: to choose the copper wire, the current density is less than 4, the current / wire cross-sectional area
The number of turns is equal to 1000/12*
