Uhm, PIC I/O pins can connect directly into the base of a small transistor
(like a BC547).

So if you connect the speaker between +5V and the transistor collector and
run the transistor emmitter to 0V you will amplify the PIC output by about
75X.  Not bad for a 10 cent investment.  (You may even need to put a
resistor in series with the speaker or reduce the size of the storage cap or
both to quiet it down).

                          +5V
                             |
                             |        22uF
                             \---------||  |------------0V
                             |
                             |
                     /--------------\
                     | speaker  |
                     \------------- /
                             |
                             | c
                       |    /
                       |  /
                    b | /
 PIC B3o----------| \
                       |  \
                       |  _\| e
                            |
                            |
                            \----------------------------0V

> -----Original Message-----
> From: Mike M [SMTP:elektrikman@DYNAMITEMAIL.COM]
> Sent: Wednesday, 8 December 1999 15:01
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Making Sound!
>
> Hey i been trying to create sound with a Pic and a speaker.  Just using
> simple statements like
>
> BSF PORTB, 3
> ;;;delay 1ms
> call delay
> BCF PORTB, 3
>
> well it works, but really really low sound.  I expected that.  The speaker
> is 8ohm, one lead to ground, and the other lead to a 22uf cap wit the pos
> side to the PIC pin 3.  Now i got the basic idea from Dontronics pic
> source book.  Wich is almost taken right out of the BASIC STAMP 1 manual
> except for the actual code :).   I would assume this setup on a stamp
> would also produce very low sound without some sort of amplifier or am i
> wrong? if so, why?
>
> Mike