If you are aiming for a few Watts, I'd probably go with basic parts like the TIP41 (NPN) and TIP42 (PNP).Īgain though, it's not the choice of transistor that will make or break this project. There are lots of possible power transistors to use as the final output. The ones I mentioned have reasonable gain and can handle up to 40 V, which should be plenty good enough to allow for a amp to impress your profesor with. If you have your own favorite jellybean small signal transistors, use them if you prefer. I'd pick jellybean parts like the 2N4401 (NPN) and 2N4403 (PNP) and stick with them for everything except for the final power output transistors. It will be the circuit, not the transistor, that makes the amp work well. You could successfully build a audio amp from many different types of BJTs.
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