extreme newbie question

[Blarg]

Been trying for months to find a watch beeper. NOT A WATCH WITH A BEEPER IN
IT! All I want are the parts or even the circuit that beeps. I've looked
at
every electronics supplier on the internet and none of them carry anything
anywhere near as small as what I'm looking for.
Anyone have a clue where to get these tiny parts?

 

[John Popelish]

Been trying for months to find a watch beeper. NOT A WATCH WITH A BEEPER IN
IT! All I want are the parts or even the circuit that beeps. I've looked
at
every electronics supplier on the internet and none of them carry anything
anywhere near as small as what I'm looking for.
Anyone have a clue where to get these tiny parts?

If the sound transducer is what you want, you can buy them from
Digikey. The CEB-20D64 is one of the smallest one they carry. There
may be smaller ones inside resonator packaged units, if you want to
dissect something.

 

[Blarg]

Thanks for the response!
The buzzer you suggested is not self contained. Requires some sort of IC
driver to make a sound.
It is also HUGE compared to what must fit inside a wrist watch.
Also weighs a gram and a half by itself, which is a bit heavy.
Nobody seems to know what is used in alarm watches or where to get the
parts.
Extremely frustrating.
Anyway, thanks again for trying. The mystery continues. (been looking for
these parts for over a year now).

 

[[email protected]]

Thanks for the response!
The buzzer you suggested is not self contained. Requires some sort of IC
driver to make a sound.
It is also HUGE compared to what must fit inside a wrist watch.
Also weighs a gram and a half by itself, which is a bit heavy.
Nobody seems to know what is used in alarm watches or where to get the
parts.
Extremely frustrating.
Anyway, thanks again for trying. The mystery continues. (been looking for
these parts for over a year now).

These buzzers consist of a piezo element ( a wafer of ceramc material
that bends when voltage is applied), possibly a resonator (not used
when the case of the watch is made to vibrate directly from the
bending) anda signal source. Sometimes the signa lsource is an
oscillator and sometimes it is an amplifier hooked up to the piezo with
a positive feedback connection that makes the amplifier produce the
resonant frequency of the bender. In a watch, the signal is uaually
generated by a digital frequency dovider based on the quartz crystal
that is the time base for the watch.

If you disect one of these resonator packages, you should find the
amplifier on a tiny circuit board and a small circular wafer of Piezo
material that is metalized and connected to the driver. If you are
able to remove the contents from the resonator, you might be able to
cement the bender onto some surface (like the back of a watch case).
http://rocky.digikey.com/WebLib/Panasonic/Web data/EFB-R A B.pdf
The smallest of these is part # P9900 (14 mm resonator case diameter).

 

[[email protected]]

Sorry. The unit I mentioned is just a bare piezo bender in a resonator
case. It requires an external driver.
Digikey part # 102-1115 is an example that includes the drive
oscillator (so can run directly off DC).
http://rocky.digikey.com/WebLib/CUI Inc/Web data/CEP-2242.pdf

 

[John Fields]

Thanks for the response!
The buzzer you suggested is not self contained. Requires some sort of IC
driver to make a sound.
It is also HUGE compared to what must fit inside a wrist watch.
Also weighs a gram and a half by itself, which is a bit heavy.
Nobody seems to know what is used in alarm watches or where to get the
parts.
Extremely frustrating.
Anyway, thanks again for trying. The mystery continues. (been looking for
these parts for over a year now).

What you're looking for is called a piezoelectric "bender" or
"bimorph". Google will get you lots of hits.

 

[Blarg]

Thanks Jpopelish! I already have some of these. I'm looking for something
smaller. Flatter, expecially. I think I need a tiny ic for a flat piezo
electric
buzzer, but I have no clue how to make/find such an ic.

 

[Blarg]

Hey, thanks. You may have put me onto something I could at least try. I
thought this would be so simple!
I still need some kind of driver for the piezo element. I could take one
out of a watch, as you said, but I will
need hundreds of these things if my application proves viable.

 

[Rich Grise]

Thanks for the response!
The buzzer you suggested is not self contained. Requires some sort of IC
driver to make a sound.
It is also HUGE compared to what must fit inside a wrist watch.
Also weighs a gram and a half by itself, which is a bit heavy.
Nobody seems to know what is used in alarm watches or where to get the
parts.
Extremely frustrating.
Anyway, thanks again for trying. The mystery continues. (been looking for
these parts for over a year now).

Go to the drugstore or Walmart and get watches for $9.95 apiece and
take the beeper out and throw the rest in your junque box.

GOod Luck!
Rich

 

[Rich Grise]

Hey, thanks. You may have put me onto something I could at least try. I
thought this would be so simple!
I still need some kind of driver for the piezo element. I could take one
out of a watch, as you said, but I will
need hundreds of these things if my application proves viable.

If it will really be that large of quantities, ask a watchmaker where
they get theirs, and/or if they'd like to sell some.

Good Luck!
Rich