What are best ICs to replace for 2.1 Computer speaker Subwoofer system.

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A bridge of diodes when disconnected from the transformer and from the PSU will have the four diodes in a "ring". Placing a voltage source (diode test) across one diode will show a diode voltage in one direction and a high voltage in the other direction.
A shorted diode would would show a very low voltage reading and an open diode would show a very high voltage in both directions.
 
i am newbie...i have intex 2.1 and i want to build only subwoofer circuit only bass/...i have onida ky thunder speaker ...so please give easiest and best diagram
So you have the fabulous Onida 29" TV with 1200W power amplifier driving 4 wall shaking 6x4" woofers mounted in its plastic cabinet and you want to improve on that?
An externally hosted image should be here but it was not working when we last tested it.

Sorry but we doubt we are up to the task, given that Technological Marvel specs.
 
help to start pcb

Where and which components...i have to use please help
 

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well, in the middle of the PCB there's the C5 saying : From Volume
So that's where the left & right channel go ( the satellites)

On one side of the PCB there's the CN(8?) labelled as Bass : In. Out. Ground
I expect a single potentiometer should be positioned in there

Then, following the path of the big supply capacitors then the rectifier diodes ....
 
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