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'[OT]:piezo buzzer'
2001\02\28@044319 by ajcsa Laszlo AII IV

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Hi!

 Anybody knows how to do a circuit witch beeping in a piezo buzzer(a
little one; like in the watches and games)?

thanx,




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2001\02\28@051659 by Vasile Surducan

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Asuming it's not a [pic] subject you may do it  with 1/4 of 4093,
one gate for frequency tone and one for duration.
Also may be done with two bipolar transistors ( but my schematics
are made on paper with pencil...so i can't attach it )
Or with one pic output pin.
Vasile


On Wed, 28 Feb 2001, Kajcsa Laszlo AII IV wrote:

{Quote hidden}

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2001\02\28@121018 by Dan Michaels

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Kajcsa Laszlo wrote:
>
>  Anybody knows how to do a circuit witch beeping in a piezo buzzer(a
>little one; like in the watches and games)?
>

You can simply drive the buzzer directly off of a PIC pin, without
need for other circuitry. However, you may want a 100 to 1000 ohm
resistor in series with the piezo to control volume and prevent
overdriving.

Simply send a square wave out the PIC pin. Piezos are supposed "tuned"
for specific frequencies, but will actually give usable output from
100 to about 5000 hz.

If the square wave doesn't sound good enough to you, you can
add some RC-filtering or a more complicated circuit to round
the corners of the pulses.

- danM

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'[OT]:piezo buzzer'
2001\03\01@155100 by Peter L. Peres
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Assuming you have a piezo disc with three contacts (one small (S) one
large (L) and the metal disc proper (D) ):

+   O--*-----*
      |     |
      \     )
  R1  /     ) L1
      \     )
      /     |
      \     *--O (L)
      |  | /C
(S) O--*--|<
        B| \E
            |
-   O--------*-O (D)

The transistor can be BC547B or C, R1 is 33K for 5V operation and L1 is
the primary coil from an audio transformer (leave the other windings
unconnected). You can use any coil or choke with up to about 10 mH of
inductance. This device is extremely loud (vs. its simplicity). If used
together with other circuits provide a decoupling capacitor between + and
- Vcc.

Peter

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