Please, anyone, where can I find 5.1 amplifier schematics to connect to my pc..

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I recommend you to try LM4780 kits from chipamp.com. If you buy two of LM4780 kit. You'll get six independent channel plus a paralelled one (because one kit includes two stereo pcb and you will make one kits one pcb parallel).
Then you get 5 x 30W in 8ohm and 1 x 120W in 4ohm. After that you must get a subwoofer filter for parallel ch. You can find a 100Hz 12dB LPF simply. After all you buy a 2x25v 500W toroidal transformer and thats all. You've got a 5.1 system....
 
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