@FabioBarone It's just a chinese version of the 2SD882. It sounds as this person wants personal tutoring, for as long as it takes, to use this part they can get to drive a speaker. All I can guess is "audio amplifier". And that's a guess. They imagine, I believe, that one transistor and some voltage is all they need to drive a speaker. Because "transistors amplify". I think it will take some significant effort to convince the OP motivation alone won't cut it and to realize there's significant learning ahead. It won't "happen right now."
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