'AW: Driving a speaker directly with a PIC'
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.
=->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
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.
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
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