Hi pradeep.g.belchada
Thank you for taking time to help me, I don't have all the information but I can give you what I have,
Input voltage is 12v dc,
I am not sure of the core size as I don't know the size of wire to use or the output currant required.
I have 1mm, 0.5mm, 0.36mm and 0.25 mm wire that I can use.
Maybe you can suggest were to start, I need ±525v (not critical) on the secondary output, to charge a capacitor of 2uF or 4uF, the capacitor will be discharged max at 300 Hz,
I have 2 cores/formers that I can use, ETD39 and ETD29,
The switching frequency will be ±47 Khz,
I am building Tahmid's SG3525 circuit to drive this and is almost finish with the PC board design.
https://tahmidmc.blogspot.com/2013/01/using-sg3525-pwm-controller-explanation.html
( I hope he does not mind me putting this link here)
Thank you very mutch for your advice.
Theunis