Hii Andre,

> I am using pic16c62 portb as output
> I am driving LEDS and one buzzer.
> Buzzer gets distorted signal.
> I checked with digital scope I get this
>
> -----------------|-|---------------
>                  | |
>                  |_|
>
>  I use  BSF    portb,RB3        ; sound when is high
>
> My question is when you set any bit high shouldn't I get
> clean 5 v signal or to have little distortion is normal.
>
> How do you use buzzers with pics.

I always use a transistor to turn on buzzers.  Electromechanical
ones are not well suited to logic drive as they cause a lot of
inductive noise on the supply pin.  Some of the Piezo devices
do work ok with just 5V but still safer to use a Transistor
and a freewheeling diode for any thing with large inductance
or capacitance (Piezo).

Not 100% sure if you have a drive problem or a resonance problem.
Many buzzers will only work well close to their resonant
frequency, they sound horrible at other frequencies.

Cheers
--
Kalle Pihlajasaari   kalle@ip.co.za   http://www.ip.co.za/ip
Interface Products   P O Box 15775, DOORNFONTEIN, 2028, South Africa
+ 27 (11) 402-7750   Fax: 402-7751    http://www.ip.co.za/people/kalle

DonTronics, Silicon Studio and Wirz Electronics uP Product Dealer