Heed help for designing a high power smps

Hai all
i want to design a high power smps for audio ampliifier. The output ratings for the smps is +/-45V with 6Amps. I am a new one in in the SMPS area. Before this i was using transformers of heavy duty and it had so much weight.
so in want to go with a new one thats why i just came for the smps. i looked in the internet and i got lots of circuits. From that i choose one and it is of +12V with 10Amps output. I thought it will be a nice one.
My doubt is that could i make modification in the transformer and shall i convert to my requirement.
For that i want to know the frequency of oscillation of the IC UC3844. In this circuit what is the frequency of oscillation.
I am thinking that instead of using the EE42 core i want to use EE55 core.Does it works??

I am giving the circuit diagram here and also the link. Please help me:-|


**broken link removed**

That circuit is a flyback supply, which isn't really suitable for your higher power demands (>250W per rail). I would use a forward converter, maybe a diagonal forward if you plan to run off of 230Vac. And you will likely need independent supplies for both +/- rails, unless you know their loads will always be balanced.

but there is one more thing is left. what about the oscillating frequency of the circuit.????. How can i find out the oscillating frequency...???

Hello

I am not expert but i can say that as your switching frequency is higher smaller the transformer size of SMPS.As well i suggest you to use H-bridge of Full bridge for switching.Finally take care of Electro magnetic interference (EMI) put some filters to avoid it...


-Regards

use ic tl494 based half bridge smps