RCC SMPS circuit modification

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How should I change the component values of this Ringing Choke converter smps circuit (op. 9v 230 ma) to get o/p of 5v 2A?
Needed for a portable class A amplifier.
There are mobile chargers of same rating but want to make it myself.
I already have a 5v 2a flyback transformer from a charger.
Replies sans rhetorics will be just fine.
Thanks.
 

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