Hello Mike, what happens is that you don't have enough power at the PIC
pin to drive the speaker to ground. All the power the speaker is
receiving is via the 22µF and the internal PIC pull up, that is a high
"resistor" value.  

Increase the current flow using an external pull up resistor, 330 Ohms
or more from the PIC pin 3 to +5Vcc.  Using resistors below 330 Ohms can
damage the PIC, well, just take it easy, ok? 

Of course the best is just use a audio amplifier or a single chip
amplifier as for example the LM386 (8 pin DIP, +5V).

Wagner 


Mike M wrote:
> 
> 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
> 
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