I do it through a 10uF cap.

PIC + ------- +cap- ---------+ speaker - ------- gnd

http://microengineeringlabs.com/resources/pbpmanual/images/speaker.gif


>> In Microchip application notes AN529, it show an example of industrial
>> clock.
>>
>> A speaker was wiring to RA0 of PIC16C57. As a typical speaker have an
>> impedence of 8-ohm. I am wondering are I/Os of 16C57 could sufficiently
>> drive the speaker. Am I missing anything?

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