need help building a switching power supply for car amps

[harp mg]

i have just built a switching power supply . project 89 of rod elliots website http://sound.westhost.com/project89.htm. i have some doubs abot the transformer. .. what can be the effect of using different sizes of cores rather that 39 for 360W

please tell me.

[Th3 uN1Qu3]

Larger core needs less turns so you can use thicker wire and get higher current thus higher power.

[harp mg]

Originally Posted by Th3 uN1Qu3

Larger core needs less turns so you can use thicker wire and get higher current thus higher power.

thanks alot for the answer.
i just wanna know is there a way to calculate the rate of turns and power exactly with different core sizes.

and how can i calculate the dia of a wire when i know the current and voltage?

[Th3 uN1Qu3]

Of course there is a way. There are lots of books on it... The ones that helped me the most are "Switching Power Supply Design Third Edition" by A. Pressman and K. Billings, "Power Supply Cookbook" by Marty Brown, and "Switching Power Supplies A to Z" by Sanjaya Maniktala.

I have some "cheat sheets" i wrote which do most of the work for you but i'll only send them to you if you show me you actually looked into those books i mentioned.

[harp mg]

Originally Posted by Th3 uN1Qu3

Of course there is a way. There are lots of books on it... The ones that helped me the most are "Switching Power Supply Design Third Edition" by A. Pressman and K. Billings, "Power Supply Cookbook" by Marty Brown, and "Switching Power Supplies A to Z" by Sanjaya Maniktala.

I have some "cheat sheets" i wrote which do most of the work for you but i'll only send them to you if you show me you actually looked into those books i mentioned.

those books maybe unavalible for me.
can you give me a link for the pdf files or the books some how