how can i connect the speaker

[pcbb]

i try the make sound while using pwm, sound command but no good sound out from pic. how can i connect the speaker 16f877.

[mat janssen]

Put an elco in series with your speaker to avoid dc current into your speaker.
A potmeter to correct the amplitude for the speaker may also help.

[skimask]

i try the make sound while using pwm, sound command but no good sound out from pic. how can i connect the speaker 16f877.

A good example of how to hook up a speaker for use with the SOUND command it right there in the PBP manual.