Piezoelectric Sensor Transducer 27mm with 3 Contacts

27mm Piezo Discs with 3 contacts are commonly used in various applications, including acoustic pickups for musical instruments like CBG (Cigar Box Guitar) and buzzers. The three contacts on the piezo disc typically consist of a positive electrode, a negative electrode and a ground electrode.

In the context of an acoustic pickup for a CBG guitar, the piezo disc can be used to capture the vibrations of the guitar strings and convert them into electrical signals. The positive and negative electrodes of the piezo disc are connected to a preamp or an amplifier circuit, which amplifies the weak signals generated by the piezo and makes them suitable for further processing or output.

The ground electrode is usually connected to the ground or common reference point of the circuit to provide a stable reference voltage. This helps in reducing noise and interference in the signal.

When used as a buzzer, the piezo disc can generate sound when an alternating voltage is applied to it. The positive and negative electrodes of the piezo disc are connected to the alternating voltage source, and the ground electrode is connected to the ground or common reference point.

It's worth noting that the exact wiring and configuration may vary depending on the specific application and the circuitry used. Therefore, it's important to refer to the documentation or instructions provided with the piezo disc or consult relevant resources for the specific wiring details in your application.

• Resonant Frequency: 4.0 ±0.5KHz
• Resonant Resistance: 500Ω Max
• Capacitance: 20,000pF ±30% @ 1KHz
• Operating Temp: -20C to 60C
• Storage Temp -20C to 70C

• Brass Disc: 27mm x .20mm
• Ceramic Disc: 20mm x .25mm

• 3 contact type piezo

Package contents:

• 1 x Piezo Discs
  

*image shown is real.