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Piezo Ceramic Disc Element 27mm - prewired

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$2.30 (inc GST) $2.09 (exc GST)
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Product Description

These are a fun and useful part. 27mm in diameter, you can use them to create sound - just give them 5V and a PWM signal. Or they can be used as a knock sensor, check out the second half of the following video:

Either way, lots of fun on the cheap. You can see how this is done in the following video that shows how they can generate tiny amounts of energy:

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