Introduction: How to Harvest a Piezo Element From a Window Alarm

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In this short instructable I will demonstrate how I harvest Piezo elements from dollar store window alarms.  Why you ask? Because these things are awesome pickups for guitars or any other acoustic instrument you are building. Also I am doing this to answer a question from a viewer of one of my instructables 

Step 1: Take Things Apart

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Open the battery compartment and remove the screw that holds everything together. Pull the back off. Pull the circuit board out and isolate the wires to the piezo.

Step 2: Isolate the Part You Want.

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In the movies they would be sweating over which wire to cut first, no such issue here, cut them both at the same time.

Step 3: Remove the Part You Want.

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OK, this is the only tricky bit, cutting the plastic housing to get the element out without bending it. A little bend won't hurt anything but you don't want to crack that white disc in the middle.


fcharest1 (author)2014-03-26

anyone knows how to make sound with this ? when I plug it to 4.5V no noise is made ?

Honhenheim (author)2012-07-02

Dollar stores are your friend, cheap made stuff, with some good insides. Screws, wires, speakers, etc. You can even get solar panels and a rechargable battery from those yard lights. Thank you for this instructable, might come in handy in the future.

tmuck (author)2011-11-20

Friger, you're still my hero. and by the way, i've started designing my electric uke. or (electruke). I can't wait to get to work on building it. :D

friger (author)tmuck2011-11-22

I love the name, quick, patent it.

mnmc10 (author)2011-11-17

this thing will make a noise when the magnet is removed but will turn off once the magnet is put back. you guys have an idea to prolong the sound for a few seconds even if you put back the magnet back? kinda like a delay?

arnefl (author)2011-11-16

And the leftover can be used for lots of things. I have one for a fridge/freezer reminder. I soldered a LED where the piezo used to be and it blinks if either freezer door or refrigerator door is open

friger (author)arnefl2011-11-17

I've never thought of that, great idea.

Bongmaster (author)2011-11-16

normally they have a hal effect sensor too, unless they cheapskate

Bongmaster (author)Bongmaster2011-11-16

im guessing the long folded metal pins overlapping each other are the reed switch, so cheap they didnt even bother with a real one O_o

About This Instructable




Bio: I live on the east coast of Canada, (New Brunswick). I have been tinkering and building things all my life and still manage to learn ... More »
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