What kind of amplifier are you looking for?
If it is for audio, this insane project might put you in the right direction: http://sound.whsites.net/project117.htm
Keep in mind that the voltages used in that project can be deadly, as stated on the page itself: One flash and you're ash !
You really need to be a bit more specific. There are lots of amplifier types around.
And have you any electronic experiance? With a question like that, it sounds as if you do not.
sorry if i did not put more information. should be audio.
i have little knowledge how to read the diagram, and already assembled one diagram with 20 watts audio amplifier.
i want to learn more how to assemble high capacity.