At 01:11 AM 8/11/97 -0700, Andre Abelian wrote:
>HI PIC  Engineers.
>
>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.
>
>
>                                thank you
>
>Andre
>


Make sure you aren't exceeding the capacitance loading for the
particular part you are using. If its a piezo buzzer it likely
has a high capacitance across it. I've run into this and found was
able to get a higher sound level by putting a resistor in series
with the buzzer. I think I used 150 ohm. The buzzer I used required
me to clock out a 2khz signal.


Regards,

------------------------------------
| Jeff King      Aero Data Systems |
| jeff@mich.com  P.O. Box 510895   |
| (810)471-1787  Livonia, MI 48151 |
|F(810)471-0279  United States     |
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