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RE: update 2

"In the morning I will see if I can set the scope to measure AC instead."

I shan't even try guessing what you mean by that.

There's nothing wrong with measuring peak-to-peak voltage of the sine wave; just divide by (2 * sqrt2) (which is about 2.83) to get the RMS voltage, like I said.

But the answer you got seems to be coming out to be much too large, implying 36 watts into 8 ohms, which just isn't believable for a single-ended amplifier like you have built. So there is evidently something wrong with your interpretation of what you are seeing on the scope. (Misreading the volts per division setting?) Or else something wrong with the scope?

You could practice by checking the output of your signal generator on the scope, and comparing the peak-to-peak voltage (divided by 2 * sqrt2) with the rms voltage you measure with a digital voltmeter. Do those two results agree, within expected experimental errors?

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