Active Buzzer Module KY-012

Active Buzzer Module KY-012

Price: $0.22Sku: FA3048
Product Introduction

Active Buzzer Module KY-012

Produst description:

The structure of the buzzer

(A) the introduction of the buzzer
1. The role of the buzzer: buzzer is an integrated structure of the electronic sound device, the use of DC power supply, widely used in computers, printers, copiers, alarm, electronic toys, automotive electronics, telephones, timers, etc. Electronic products for sound devices.
2. Buzzer classification: mainly divided into piezoelectric buzzer and electromagnetic buzzer two types.
3. Buzzer circuit graphic symbol: buzzer in the circuit with the letter “H” or “HA” (old standard with “FM”, “LB”, “JD”, etc.).
Buzzer diagram

(B) the structure of the buzzer principle
1. Piezoelectric buzzer: Piezo buzzer mainly composed of multivibrator, piezoelectric buzzer, impedance matching and resonance box, shell and other components. Some piezoelectric buzzer shell is also equipped with light-emitting diodes.
Multivibrator consists of a transistor or an integrated circuit. When the power is turned on (1.5V-15V DC operating voltage), the multivibrator starts, output 1.5-2.5kHZ audio signal, the impedance matching device to promote the piezoelectric buzzer sound.
The piezoelectric buzzer is made of lead zirconate titanate or lead niobium magnesium lead piezoelectric ceramic material. Silver electrodes are plated on both sides of the ceramic sheet, polished and aged, and then with the brass or stainless steel sheet together.
2. Electromagnetic buzzer: electromagnetic buzzer by the oscillator, electromagnetic coil, magnet, vibration diaphragm and shell and other components.
When the power is turned on, the audio signal generated by the oscillator is passed through the electromagnetic coil to cause the electromagnetic coil to generate a magnetic field. Vibration diaphragm in the electromagnetic coil and the interaction of the magnet, the periodic vibration of the sound.

(C) the production of buzzer
(1) Preparation of electromagnet M: about 6 cm on the iron bolts around the 100-lap wire, wire 5 cm left for the lead, with a transparent tape to stick the coil, so as not to release the coil, and then tape it stick In a box, the electromagnet is ready.
(2) Preparation of shrapnel P: from the iron cans on the box cut a width of about 2 cm long iron, bent at right angles, the electromagnet of a lead wire connected to the shrapnel, and then the adhesive tape on the board.
(3) with the paper handle to do contact Q, with the book to paste the needle pad high, with adhesive tape, leads to a wire, as shown in Figure a good circuit.
(4) adjust the distance between M and P (by moving the box), so that the magnet can attract the shrapnel, adjust the distance between the contact and the shrapnel, so that they can just touch, you can hear the beep after power.

(D) active buzzer and passive buzzer
Teach you to distinguish between active buzzers and passive buzzers
Now a small buzzer sold on the market because of its small size (diameter only llmm), light weight, low price, solid structure, and widely used in a variety of need to sound the electrical equipment, electronic production and SCM and other circuits The
From the appearance point of view, the two buzzers seem the same, but look carefully, the height of the two slightly different, active buzzer a, height of 9mm, and passive buzzer b height of 8mm. If the two buzzer pins are placed up, you can see a green circuit board is a passive buzzer, no circuit board and a closed with a black rubber is a buzzer The
To further determine the active buzzer and passive buzzer, you can also use the multimeter resistance file Rxl file test: with a black pen to connect the buzzer “+” pin, red pen on the other pin back and forth touch, If the trigger is clicked, the noise is only 8Ω (or 16Ω) is a passive buzzer; if you can issue a continuous sound, and the resistance in a few hundred or more, is the active buzzer.

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