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Piezo Buzzer vs Piezo Transducer
A Piezo Buzzer will output a continuous tone when the rated DC voltage is applied to its terminals. The Piezo Buzzer contains an internal oscillator to produce a typical 1-2 KHz tone. A Piezo Transducer is really a speaker that requires an audio oscillating tone be applied to its terminals to produce a sound. No sound will be produced when a DC voltage is applied.

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PKB8-4AO Piezo Buzzer PCB
CA$3.53

Our Best Selling Piezo Buzzer. Voltage: 4 - 20 volts DC Color: Black Dimensions: 7/8" x 11/16" high.

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61-211-0 Buzzer
61-211-0 Buzzer
CA$2.70

Buzzer 4-8 VDC. 100mm leads Current: 35mA Output: 85db @ 20cm Freq.: 2KHz.

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61-212-0 Buzzer
61-212-0 Buzzer
CA$2.70

Buzzer 8-16 VDC. 100mm leads Current: 35mA Output: 85db @ 20cm Freq.: 2KHz.

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61-231-0 Buzzer 4-8 VDC
61-231-0 Buzzer 4-8 VDC
CA$2.70

Panel Mount Buzzer with 100mm leads. Input voltage 4 ~ 8 VDC. Max. Rated Current:: 33mA/6VDC. Resonant Frequency: 400. 

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61-223-0 Piezo Buzzer 4-8 VDC
61-223-0 Piezo Buzzer 4-8 VDC
CA$2.70

Complete with internal driver. Current: 30mA Sound output: 85db @ 10cm Frequency: 2KHz.

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61-224-0 Piezo Buzzer 8-15 VDC
61-224-0 Piezo Buzzer 8-15 VDC
CA$2.70

Complete with internal driver. Current: 30mA Sound output: 85db @ 10cm Frequency: 2KHz.

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61-302-0 Panel Mount Audio Alarm
61-302-0 Panel Mount Audio Alarm
CA$8.30

Input voltage 4 ~ 28 VDC, Tone output Pulsed tone.  Current: 15mA. Sound output: 80db @ 100cm. Frequency: 3.2KHz5.

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61-232-0 Buzzer 9-15 VDC
61-232-0 Buzzer 9-15 VDC
CA$2.70

Panel Mount Buzzer with 100mm leads. Input voltage 9 ~ 15 VDC. Max. Rated Current:: 33mA/6VDC. Resonant Frequency: 400. 

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61-233-0 Buzzer 15-27 VDC
61-233-0 Buzzer 15-27 VDC
CA$2.70

Panel Mount Buzzer with 100mm leads. Input voltage 15 ~ 27 VDC. Max. Rated Current:: 33mA/6VDC. Resonant Frequency: 400.

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7BB-20-6L0 Piezo Element
7BB-20-6L0 Piezo Element
CA$2.76
You can use these for tap or knock sensors pretty easily by reading the voltage on the output. They can also be used for a very small audio transducer such as a buzzer.
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COM-07950 Piezo Speaker - PC Mount 12mm 2.048kHz
COM-07950 Piezo Speaker - PC Mount 12mm 2.048kHz
CA$3.00

This is a small 12mm round speaker that operates around the audible 2kHz range. You can use these speakers to create simple music or user interfaces.

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1739-ADA Large Enclosed Piezo Element w/Wires
1739-ADA Large Enclosed Piezo Element w/Wires
CA$2.23
This large (30mm diameter) piezo element is nicely enclosed with mounting holes so you can attach easily. Piezo elements convert vibration to voltage or voltage to vibration. 
Delivery within 2-3 weeks
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BUZ-120 5V Piezo Active Buzzer
CA$1.63
This 12mm diameter buzzer operates at 5V and is an excellent sound alarm for microprocessor projects.
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AM-121P Piezo Transducer Module
CA$2.19
This Piezo transducer module can be used to generate different sounds for robotic projects such as an alarm or proximity detection sound. Requires a sine or square wave drive input signal of 3.3 to 5 volts peak to peak. Comes with a three pin connector and two screw mounting holes for easy assembly into projects.
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BUZ-200-27MM 27mm Piezo Element
CA$1.08
This Piezoelectric element can turn any mechanical energy into electrical energy (AC). For this reason, you can use it as a knock or tap sensor. You can also implement it in any of your Arduino projects by connecting it to the analog inputs of the microcontroller (see link for more details). You can feed the sensor AC voltage as well. This (coupled with the right frequency) can turn the element into a buzzer or speaker. You won’t need to worry about soldering any leads as they come with pre-soldered red and black wires. Note that this sensor in particular has a diameter of 27mm.
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