I'd like to use a piezo buzzer for my application. I've ordered abotu 10 of them, all different sizes, and connected it to a 16F870 just like the PBP manual states (in the "sound" portion). It says to use a 10uF cap and that it will work.

Well, it works but the volume is really low. How can I increase this volume on the piezo? Perhaps something easy with one or two components?

I am using a 9V battery with a 5V regulator.

Thanks!