I've been working through the projects in the Make: Electronics book. Up to this point, the only transistor used in all the projects is the 2N2222. It's often used to drive a small speaker in the siren/noise-maker circuits in this book. Sometimes two 2N2222s are connected 'in series' to drive the speaker...one wouldn't be enough as the book explains.
What is a good alternative the the 2N2222, but offering higher current potential to properly drive a small or midsize speaker with only one transistor? It doesn't matter if it's a bit larger in size. It must be NPN and 3 terminals...used just like the 2N2222, as well as very easy to find. It will be used in battery-powered circuits of 9V or less. Forgive the basic-ness of this question.
What is a good alternative the the 2N2222, but offering higher current potential to properly drive a small or midsize speaker with only one transistor? It doesn't matter if it's a bit larger in size. It must be NPN and 3 terminals...used just like the 2N2222, as well as very easy to find. It will be used in battery-powered circuits of 9V or less. Forgive the basic-ness of this question.