Buzzers

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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US$3.91
Octopus Analog Noise Sound Sensor Detection Module is a sensor module based on MIC sound sensing element. Sound Sensor is particularly sensitive to sound intensity, and it can be used to detect ambient sound level. Louder noise brings bigger output Sine wave amplitude.
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US$3.50
Octopus Electronic Bricks, you can use them build electronics projects just as easy as piling bricks. By using Octopus electronic bricks, you may connect Arduino/Freaduino compatible boards easily with various digital, analog and I2C/Uart interfaces. These the breadboard-less firm connection are prepared to extensive modules like poteniometers, sensors, relays, servos even buttons, just plug and play.  Octopus Passive buzzer Brick is based on a passive buzzer, it could control the volume by PWM. The distinction is active buzzer stickers.
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US$1.81

This is a generic buzzer that will make a sound when voltage is applied from 3-24VDC. Unlike some other piezo based buzzers, this buzzer will make a sound whenever voltage is applied continuously until the power source is removed.

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US$1.81

This is a generic buzzer that will make a sound when voltage is applied from 3-24VDC. Unlike some other piezo based buzzers, this buzzer will make a sound whenever voltage is applied continuously until the power source is removed.

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US$2.79
This is a generic buzzer that will make a sound when voltage is applied from 12VDC. Unlike some other piezo based buzzers, this buzzer will make a sound whenever voltage is applied continuously until the power source is removed.
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US$0.99
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 35mm.
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US$1.25
Underneath the plastic enclosure sits a 30mm diameter piezo element that is nicely enclosed with mounting holes so you can attach easily to your desired surface. The way Piezo works is by converting vibration to voltage and vise-versa, using a very thin and vibration-sensitive mesh. Meaning that it can be used as a buzzer or it can be used to detect vibrations which cause the piezo to generate analog voltage that a micro controller can read.
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US$0.94
This 14x4mm buzzer will require a 100 ohm resistor on the red wire to a PWM source or ac voltage in order to generate a tone. Unlike the active buzzer that only requires a constant voltage this passive buzzer will need a microcontroller to help it run. We recommend using this product with an Arduino Uno. Excellent for a simple project use as the buzzer not that loud compared to the BUZ-120.
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US$0.92
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 12mm.
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US$0.94
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 15mm.
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US$0.95
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 20mm.
In stock
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US$0.98
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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US$1.99
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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US$1.48
This 12mm diameter buzzer operates at 5V and is an excellent sound alarm for microprocessor projects.
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US$2.03
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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