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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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BUZ-225-35MM 35mm Piezoelectric Ceramic Buzzer
CA$0.59
  • Piezoelectric ceramic buzzer sheet is formed by the coated electrode material as silver-metal ceramic sheet through polarization, which is mainly circular, square, rectangular and so on. It can be bonded together with metal materials such as iron, copper, steel and nickel alloy to form parts with high strength.Main performance indicators: resonance frequency Fr, impedance R, static electro - air C0.
  • Piezoelectric ceramic buzzer is a basic electronic sound device, which has the advantages of simple structure, stable performance and reliability.It is not only the core component of piezoelectric buzzer, ringing and alarm, but also increasingly used as impact signal sensor in various sensitive instruments.
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BUZ-322 5140 Ultrasonic Buzzer with Eared
CA$2.99
Ultrasonic Buzzer Speakers are frequently used to generate sound in digital quartz watches and other electronic devices, and are sometimes used as tweeters in less-expensive speaker systems, such as computer speakers and portable radios.
 
 
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BUZ-200-18MM 18mm Piezo Element
CA$1.03
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 18mm.
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BUZ-200-10MM 10mm Piezo Element
CA$0.88
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 10mm.
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BUZ-122 3V Active Buzzer Magnetic Long Continuous Beep Tone Alarm Ringer
CA$1.49
This is a 12mm MINI active piezo buzzers fit for computers printers, arduino, etc.,
 

 

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BUZ-320 3840 Ultrasonic Buzzer Speaker
CA$1.89
Ultrasonic Buzzer Speakers are frequently used to generate sound in digital quartz watches and other electronic devices, and are sometimes used as tweeters in less-expensive speaker systems, such as computer speakers and portable radios.
 
 
Delivery within 2-3 weeks
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BUZ-325 3840 Ultrasonic Mosquito Dispeller Buzzer
CA$1.99
It is High power, with easy positioning hole, waterproof type which is suitable for outdoor and wet conditions and indoor use.
It can be used to drive rats too. 
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BUZ-121 SOT 5V Magnetic Buzzer Plastic Tube
CA$1.29
This 12mm diameter buzzer operates at 5V and is an excellent sound alarm for microprocessor projects. 
 
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WEMOS-BUZ Shield V1.0.0 Diy Module For Wemos ESP8266 D1 Mini
CA$5.48
It will be activated with a HIGH level on one of the pins D5-D8 (selectable). The kit includes male and female standard connectors as well as "long lead" stackable headers.
 
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AD16-22SM-24V-RD Flashing Red LED Indicator 24V, Intermittent Buzzer Alarm, Panel Mount 22mm
CA$3.45
The AD16-22SM-24V-RD is a flashing red 24V LED indicator, with intermittent buzzer alarm, panel mount 22mm.
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AD16-22SM-24V-GN Flashing Green LED Indicator 24V, Intermittent Buzzer Alarm, Panel Mount 22mm
CA$3.45
The AD16-22SM-24V-GN is a flashing green 24V LED indicator, with intermittent buzzer alarm, panel mount 22mm.
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AD16-22SM-12V-GN Flashing Green LED Indicator 12V, Intermittent Buzzer Alarm, Panel Mount 22mm
CA$3.45
The AD16-22SM-12V-GN is a flashing green 12V LED indicator, with intermittent buzzer alarm, panel mount 22mm.
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AD16-22SM-12V-RD Flashing Red LED Indicator 12V, Intermittent Buzzer Alarm, Panel Mount 22mm
CA$3.45
The AD16-22SM-12V-RD is a flashing red 12V LED indicator, with intermittent buzzer alarm, panel mount 22mm.
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BUZ-24V-100-LED, 24V Red LED Blinker Alarm Buzzer 100dB w/wires.
CA$8.49

Red LED Blinker 24V Alarm Buzzer 100dB w/wires

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BUZ-12V-100-LED, 12V Red LED Blinker Alarm Buzzer 100dB w/wires.
CA$8.49

Red LED Blinker 12V Alarm Buzzer 100dB w/wires

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