It may not be loud enough for your taste. I mean, you even provided a datasheet; why don't you read it and do some math to determine the available output power?
It would be better if you had a book rather than the scope. Get a hobby electronics book or magazine with some example circuits and build a dozen of those. Then modify the circuits to fit your needs. Finally, start designing on your own. That's what got most of us started here.
Of course the 'Net is full of hobby stuff as well, but it often takes some experience to judge if something is hard or easy to build, or if it is downright bogus. Printed publications specifically geared at the hobbyist are better in that regards. Elektor used to have those "300+ circuits" books, maybe they're still available.
Sure, but it would be rather horrid. You're not going to get any power out of it and the crossover distortion of a LM324 is pretty bad. The frequency response won't be anything to write home about either.
You could put a complimentary pair of transistors on the output. This will get you some more power but the crossover distortion will still be bad (and frequency response worse).
LM324 is terrible for audio. Use, say, an LF347. But 1/4 of a little opamp will never give you enough power to drive a speaker to useful levels. For that you need big parts.
I'm sure the missionaries have a different position on that. Last time I was talking to a missionary I mentioned that kid is taking a course primarily intended for "heritage language" students. He got this shocked expression on his face.. though I said it was intended for "heretics".
Best regards, Spehro Pefhany
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"it's the network..." "The Journey is the reward"
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