Small Passive Buzzer Module for Arduino Alarm Sound Speaker Raspberry pi

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  • This product is a buzzer module that can be used as an alarm for the Arduino. 


The structure principle of buzzer

(1) the introduction of a buzzer

  • The role of the buzzer buzzer is an integration of electron acousticstructure, USES the dc power supply, is widely used in computers, printers,photocopiers, alarm, electronic toys, automotive electronic equipment,telephone, timer and other electronic products for voice devices.

  • Buzzer classification: mainly divided into piezoelectric buzzer and magneticbuzzer two types.

  • The buzzer circuit graphic symbol: buzzer in circuit with the letter"H" or "HA" (old standard with "FM","LB", "JD", etc.)

  • Buzzer schematic

(2) the structure principle of buzzer

  • The piezoelectric buzzer: piezoelectric buzzer buzzer is mainly bymultivibrator, piezoelectric, impedance matching unit and sound box, shell,etc. Some of the piezoelectric buzzer also equipped with light-emitting diodes(leds).

  • Multivibrator composed of transistors or integrated circuits. When afterturning on the power supply (1.5 V to 15 V dc voltage), multivibratorvibration, 1.5 2.5 kHZ audio signal output, impedance matcher drivingpiezoelectric buzzer sound.

  • By lead zirconate titanate piezoelectric buzzer or niobium magnesium acid leadpiezoelectric ceramic materials. On both sides of the ceramic chip platingsilver electrodes, after polarization and aging treatment, with brass orstainless steel pieces together again.

  • Magnetic buzzer: magnetic buzzer by the oscillator, the electromagneticcoil, magnets, vibration membrane and shell, etc.

  • After turning on the power supply, audio signals generated by oscillator byelectromagnetic coil current, make the electromagnetic coil produces magneticfield. Diaphragm vibration under the interaction of electromagnetic coil andmagnet, periodic vibration.

(3) the buzzer

  • Electromagnet M: (1) preparation on the iron bolts of about 6 cm long around100 laps conductor, terminal 5 cm for lead, coil with transparent tape gluedwell, lest you release coil, and then stick it in a box with tape,electromagnet is ready.

    (2) preparation of shrapnel P: cut off from the iron cans a long iron about 50px wide, bent at right angles, the electromagnet is one of the lead in theshrapnel, reoccupy adhesive shrapnel close to on board.

  • Do contact Q (3) with a paper clip, the paper clip book mat is high, the cementwith tape to elicit a conductor, as shown in figure good connection circuit.

    (4) to adjust the distance between the M and P (by moving the box), make theelectromagnet attract shrapnel, adjust the distance between the contact andshrapnel, that they can contact, after electrify can hear a hum.

    (4) of passive and active buzzer buzzer

  • Teach you how to distinguish between passive and active buzzer buzzer

  • Now in the market to sell a small buzzer because of its small size (diameteronly LLMM), light weight, low price, stable structure, and widely used invarious kinds of need of sound electrical equipment, electronic production andMCU circuit, etc.

  • Look from the appearance of figure, two kind of buzzer are like, but lookclosely, the height of the slightly difference, active buzzer, a height of 9mm, and the height of the passive buzzer b to 8 mm. If the two pins are placedon the buzzer, it can be seen with a green circuit board is a kind of passivebuzzer, no circuit board with black rubber seal is a kind of active buzzer.

  • Blend step judgment of passive and active buzzer buzzer, can also use themultimeter resistance Rxl gear test: "+" pin with black pens and pickup a buzzer, red pens and back and forth to touch on a pin, if the trigger outsound making, and the resistance of only 8  (or 16 ) is a passive buzzer; If can continue to sound andresistance in hundreds of the above, is an active buzzer.

  • Active buzzer is directly connected to the rated power (new buzzer areindicated in the label) can be continuous voice; While passive buzzer andelectromagnetic speaker, need to connect to voice in the audio output circuit.


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