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'pic based alarm..'
1997\08\20@171456 by Ravindra Divekar

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what is the cheapest peizo-electric device/buzzer available in
the market, and how do i interface it ?
i dont care what frequency(ies) it is, i just need to
make my circuit hoot.

--ravindra/

1997\08\21@111444 by lilel

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Ravinda asked:

> what is the cheapest peizo-electric device/buzzer available in
> the market, and how do i interface it ?
>  i dont care what frequency(ies) it is, i just need to
> make my circuit hoot.
>
> --ravindra/

Lawrence "The King Of Cheap" replied:

Murata Electronics makes a line of piezo alarms that are pretty
basic.  One approach is to use a piezo element with a plastic case
around it such as part number PKM17epp-4001.  They look like an
aspirin with two legs, about 17 mm diameter and 7 mm tall.   $0.35 US
if you are buying several thousand.

The cheapest approach is to design the sound chamber (that's what the
case is for) into your plastic cover for your product.  This is
assuming you have the power to mold any shape you want.  Pop the
piezo into the case (they look like a US quarter)  and make some
contacts for it.  springs soldered to the board work OK.

Murata North America can be contacted at 1-800-831-9172

-- Lawrence Lile

Download AutoCad blocks for electrical drafting at:
http://members.sockets.net/~llile/index.htm

1997\08\21@111455 by lilel

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Ravinda wrote:
> what is the cheapest peizo-electric device/buzzer available in
> the market, and how do i interface it ?

Interfacing a piezo is a cinch.  Hook one lead to a port, another to
ground.  Run a 3000 to 4000 HZ signal out the port, you get noise.
Want more noise?  Hook both leads to port pins and push-pull them.

-- Lawrence Lile

Download AutoCad blocks for electrical drafting at:
http://members.sockets.net/~llile/index.htm

1997\08\21@112518 by Lynn Richardson

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At 02:09 PM 8/20/97 -0700, you wrote:
>what is the cheapest peizo-electric device/buzzer available in
>the market, and how do i interface it ?
> i dont care what frequency(ies) it is, i just need to
>make my circuit hoot.
>
>--ravindra/
>
>

Murata's PKM22EPP-4001 goes for $0.72 ea in 100's at Future Active Inc.
Not loud (75 dB @ 10CM with 3VAC drive @ 4kHz).  Can be driven with 30VAC
for another 20dB.
---------------------------------------------------------------------------
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1997\08\21@235637 by Pedro Drummond

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>One approach is to use a piezo element with a plastic case
>around it such as part number PKM17epp-4001.  They look like an
>aspirin with two legs, about 17 mm diameter and 7 mm tall.

Gosh, I guess I took 2 of these for a headache, yesterday.

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