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PICList Thread
'AW: Driving a speaker directly with a PIC'
1997\04\07@064734 by OU=COMPUGROUP_CN=RECIPIENTS_CN=EHE

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Use a high-impedance speaker together with a small transformer.
Or, if your sound frequency doesn't vary very mutch, use a piezo
transducer in parallel
with an impedance of some mH.
I 've used this for an alarm device. Produces VERY loud sounds.

{Quote hidden}

1997\04\09@095158 by Scott Horton

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=->Use a high-impedance speaker together with a small transformer.
=->Or, if your sound frequency doesn't vary very mutch, use a piezo
=->transducer in parallel
=->with an impedance of some mH.
=->I 've used this for an alarm device. Produces VERY loud sounds.

I, also need a "beeper" driven by my PIC.  I also need something loud as
possible.

I'm and ME and no Electronics guru by any stretch.  Is there any chance
that with some blatant begging (please, please <g>) I could get you to give
me some details on what you described?  Size/value of inductor and piezo
would be a big help.  I use digikey, mouser (and others) here in the U.S.
for suppliers.  If you could recommend any specific part #'s that, too
would be greatly appreciated.

     |--|--|
     |  |  |
PIC|--|  I  P
  |     I  P    P=piezo
  |     |  |    I= inductor
        G  G    G= ground

Is the above right or should I go between PIC pins like Werner was doing
for a bigger swing with his speaker?  PIC's internal diodes enough for
protection from the inductor?

Pulse the pic pin on/of at some frequency.  What duration/width?

Thanks very much for any help you can give.

Scott

1997\04\09@152904 by peter

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I have not tried this but if your going to use a
peizo it may be worth trying a trigger transformer,
the type used in strobe lights
They are very small and have a ratio of around 25:1
and cost less then a dollar.

ie: 5V = 125V
should be worth a try

Peter Cousens
EraseMEpeterspam_OUTspamTakeThisOuTcousens.her.forthnet.gr

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