A typical speaker DOES have an 8-ohm impedance. However, 100-ohm speakers
are readily available, and at 5V/25ma have a very useable volume. Normally that
is what is meant.

I normally drive the speaker through a 220uF electrolytic cap.

--Bob

At 12:18 PM 11/26/2003, you wrote:
>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?
>
>Thanks in advance.
>
>WH Tan
>
>--
>http://www.piclist.com#nomail Going offline? Don't AutoReply us!
>email listserv@mitvma.mit.edu with SET PICList DIGEST in the body

--------------
Bob Axtell
PIC Hardware & Firmware Dev
Tucson, AZ
1-520-219-2363
"I lose some on each sale but make it up in volume."

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body