Garsinis signalizatorius 1,5-15Vdc 1.5-2.5kHZ Mažo pasyvaus skambučio modulis, analogas Arduino KY-006

1.
 The function of the buzzer: the buzzer is an integrated structure of 
the electronic buzzer, powered by a DC power supply, and is widely used 
in computers, printers, copiers, alarms, electronic toys, automotive 
electronic equipment, telephones, timers, etc. Used as a sounding device
 in electronic products. 

2. Buzzer classification: mainly divided into two types: piezoelectric buzzer and electromagnetic buzzer. 

3. The circuit graphic symbol of the buzzer: the buzzer is represented 
by the letter "H" or "HA" in the circuit (the old standard uses "FM", 
"LB", "JD", etc.). 





(2) The structure principle of the buzzer 



1. Piezoelectric buzzer: The piezoelectric buzzer is mainly composed of a
 multivibrator, a piezoelectric buzzer, an impedance matcher, a 
resonance box, and a shell. Some piezoelectric buzzers are also equipped
 with light-emitting diodes. 

　　 Multivibrator is composed of transistors or integrated circuits. When
 the power is turned on (1.5V-15V DC working voltage), the multivibrator
 will vibrate and output 1.5-2.5kHZ audio signals, and the impedance 
matcher will drive the piezoelectric buzzer to sound. 

　　The piezoelectric buzzer is made of lead zirconate titanate or lead 
magnesium niobate piezoelectric ceramic material. Silver electrodes are 
plated on both sides of the ceramic sheet, and after polarization and 
aging treatment, they are then glued together with the brass sheet or 
stainless steel sheet. 

2. Electromagnetic buzzer: The electromagnetic buzzer is composed of 
oscillator, electromagnetic coil, magnet, vibrating diaphragm and shell.
 

　　 After the power is turned on, the audio signal current generated by 
the oscillator passes through the electromagnetic coil, causing the 
electromagnetic coil to generate a magnetic field. The vibrating 
diaphragm periodically vibrates and produces sound under the interaction
 of the electromagnetic coil and the magnet. 







(3) Making of the buzzer 



(1) Preparation of electromagnet M: Wind 100 turns of wire on an iron 
bolt with a length of about 6 cm, leaving 5 cm at the end of the wire as
 a lead, and stick the coil with transparent tape to prevent the coil 
from loosening, and then stick it with tape On a box, the electromagnet 
is ready. 

　　 (2) Preparation of shrapnel P: Cut a long iron piece with a width of 
about 2 cm from the iron can, bend it at a right angle, connect a lead 
of the electromagnet to the shrapnel, and then use tape to stick the 
shrapnel on the wooden board. 

　　 (3) Use a paper clip as the contact Q, put the paper clip up high 
with a book, glue it firmly with tape, and lead out a wire. Connect the 
circuit as shown in the figure. 

　　 (4) Adjust the distance between M and P (by moving the box), so that 
the electromagnet can attract the shrapnel, adjust the distance between 
the contacts and the shrapnel, so that they can just touch, and you can 
hear the buzzing sound after power on.