Maker Pro
Maker Pro

please help me build a 12volts rectifying circuit

I really need a help on how to build a 12volts rectifying circuit, that will be stable when it is supplied to a power amplifier.With the ones that i built, when i check for the output it gave me 12.09volts but when i connect it to a power amplifier it reads as 9volts which is not able to drive the power amplifier. Also it makes my amplifier produce a lot of noise.So please help me out. Thanks.
 
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