>and of course, the speaker.  A large diameter piezo make sense, but it
>will never sound that great being a cheap speaker.  That may be all we
>need though.  Tie it to 18V across a resistor, power it with a 2N2222A
>common emitter, and run the base to the PIC through a 1K resistor.  That
>is the simplest sound output you can find, and will work fine for simple
>sounds.  We are not playing MP3's here you know.

Well if going this route, and using a wall wart at 9-18V, then why not use
an LM386 power amp IC, or similar, and a transistor radio speaker.

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