My digital multimeter uses a piezo-electric thing for a continuity
tester, and it has failed. I call it a "thing" because I'm no longer
sure if it is a buzzer, diapragm, or some of the other things.

If one is called "externally driven", does that mean it will have 3
wires instead of two?? No pictures are given where that word is used.

Trying to find a replacement. It's quite small. It's like a plate or
disk, 22mm in diameter, 4.5mm high. It has two ears for mounting,
and on the top there are embossed concentric circles, with a hole in
the middle of them, with a copper diaphragm visible through the hole.

At a hamfest I bought one that was the right size, but it has 3 wires
instead of 2. I don't know how to make that work. I think I need one
with only 2 wires.

My meter is a Circuitmate DM25, fwiw. The original beeper had no part
number, but the one I bought is PKM11-6A0 (or O). From looking at
catalogs, the eleven should represent a diameter (right?) of 11mm, but
in fact, it is 22mm in diameter.

WWW.mouser.com has an enormous variety of stuff. It even has
81-PKM11-6AO, made by Murata, but there are no pictures at the Mouser
or Murata websites. Still, I'm sure it has 3 wires and it is probably
11 mm in diameter, if there is such a thing.

Any advice?




** This one is like a dinner plate, 22mm in diameter, with two "ears"
with holes for mounting, 4.5mm high, and the top has concentric
circles showing in the black plastic with a hole in the middle for
the sound.

Meirman
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meirman wrote:

My digital multimeter uses a piezo-electric thing for a continuity
tester, and it has failed. I call it a "thing" because I'm no longer
sure if it is a buzzer, diapragm, or some of the other things.

If one is called "externally driven", does that mean it will have 3
wires instead of two?? No pictures are given where that word is used.

Trying to find a replacement. It's quite small. It's like a plate or
disk, 22mm in diameter, 4.5mm high. It has two ears for mounting,
and on the top there are embossed concentric circles, with a hole in
the middle of them, with a copper diaphragm visible through the hole.

At a hamfest I bought one that was the right size, but it has 3 wires
instead of 2. I don't know how to make that work. I think I need one
with only 2 wires.

My meter is a Circuitmate DM25, fwiw. The original beeper had no part
number, but the one I bought is PKM11-6A0 (or O). From looking at
catalogs, the eleven should represent a diameter (right?) of 11mm, but
in fact, it is 22mm in diameter.

WWW.mouser.com has an enormous variety of stuff. It even has
81-PKM11-6AO, made by Murata, but there are no pictures at the Mouser
or Murata websites. Still, I'm sure it has 3 wires and it is probably
11 mm in diameter, if there is such a thing.

Any advice?




** This one is like a dinner plate, 22mm in diameter, with two "ears"
with holes for mounting, 4.5mm high, and the top has concentric
circles showing in the black plastic with a hole in the middle for
the sound.

Meirman
--
If emailing, please let me know whether
or not you are posting the same letter.
Change domain to erols.com, if necessary.

Consider the possibility that only two of the connections are
functional, with the third there only for registration. I've got
some Sonalerts that are apparently like that.


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