I did a project that ran on a 3V lithium battery and used two PIC pins in
bridge mode, driving the piezo directly. It was loud enough in that
application. I think a lot of the loudness will be determined by the
acoustinc properties of the enclosure, choice of frequency (enclosure
resonance), etc.

Harold


-- 
FCC Rules Updated Daily at http://www.hallikainen.com - Advertising
opportunities available!
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist