regulated supply +- 28V -20A

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hello guys
i made a power amp using opa549 chips , bridged stereo
now the chips max voltage is -+ 30V my traffo makes more , so i need to regulate it , now i need 20amp :hot: and i dont know what device(s) to use , any help will be appriciated
 
Hi,
can you alter the transformer? Remove turns to reduce it's output.
How about adding a capacitance multplier? You can adjust the output voltage by varying the dropper resistors feeding the base of the pass transistor. Some contributors don't like this as a solution.
 
try this ckt it is easy. The emitter of the transistor forms the output. You can use the same for negative supply also. hope this helps

Venki.:D
 

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