amp testing

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Hello all,
I got a few questions for ye all and would much apperciate any help you could give. I have been building audio amp ic circuits to test using liberty audio praxis software and have hit a brick wall as regards my next step. At the mo i have a circuit built around an lm1875. Im wondering will a standard 8 ohm resistor be sufficent as are placement for the speaker or are heat sinks nessesary. I am woundering how to connect the output signal to the pc for analysis. oh and one thing, i havent got the greatest electronic knowledge so if u you could leave out as much jargon as possible id be a happy man.
thanks from jack.
 
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