4 pieces 27mm gold color Piezo Discs piezoelectric element- piezoelectric transducer-piezoelectric sensor- with 2 wire leads PRIELSYS

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27mm Piezo elements come in handy when you need to detect vibration or a knock. You can use these for tap or knock sensors pretty easily by reading the voltage on the output. They can also be used for many applications such musical instruments, vibration sensor, and a very small audio transducer such as a buzzer.This basic Piezo Element measures 27mm it is piezo transducer and is a great vibration sensor. Attach the round disc to the object like guitar drums musical instruments and piezoelectric generator that will be knocked on such as a door and measure the voltage across the two wires. Piezo elements can also produce sound when a voltage is applied across them. They convert between electricity and vibration in both ways; Vibration applied at the round end can be detected as a voltage across the wire leads and inversely, voltage applied across the wire leads causes the round end to vibrate.