Active buzzer
Time:
2023-06-13 22:20
Source:
Active buzzer is an integrated electronic sounder powered by DC voltage, widely used as a sound device in electronic products such as computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, telephones, timers, etc. Buzzers are mainly divided into two types: piezoelectric buzzers and electromagnetic buzzers. The buzzer is represented by the letters "H" or "HA" in the circuit (old standards used "FM", "LB", "JD", etc.).
1. Piezoelectric buzzer Piezoelectric buzzer mainly consists of a multi harmonic oscillator, piezoelectric buzzer, impedance matching device, resonant box, shell, etc. Some piezoelectric buzzers are also equipped with light-emitting diodes on their shells.
A multivibrator is composed of transistors or integrated circuits. When the power is turned on (with a DC working voltage of 1.5-15V), the multi harmonic oscillator vibrates and outputs an audio signal of 100-500Hz. The impedance matching device pushes the piezoelectric buzzer to produce sound.
The piezoelectric buzzer is made of Lead zirconate titanate or lead magnesium niobate piezoelectric ceramic materials. Plating silver electrodes on both sides of the ceramic sheet, polarizing and aging treatment, and then sticking it together with brass or stainless steel sheets.
2. Electromagnetic buzzer The electromagnetic buzzer consists of an oscillator, electromagnetic coil, magnet, vibrating diaphragm, and casing.
After turning on the power, the audio signal current generated by the oscillator passes through the electromagnetic coil, causing the electromagnetic coil to generate a magnetic field. Vibration diaphragm intertwining between electromagnetic coil and magnet
Buzzer
(1) Preparation of electromagnet M: Wrap 100 turns of wire on an iron bolt about 6 centimeters long, leaving 5 centimeters at the end of the wire as a lead. Use transparent tape to stick the coil tightly to prevent it from loosening, and then use tape to stick it to a box to make the electromagnet ready
(2) Preparation of shrapnel P: Cut a long piece of iron about 2 centimeters wide from the tin can box, bend it into a right angle, connect one lead of the electromagnet to the shrapnel, and then use adhesive tape to tightly adhere the shrapnel to the wooden board
(3) Use a paper clip as the contact Q, raise the paper clip with a book, stick it firmly with tape, lead out a wire, and connect the circuit properly
(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 make perfect contact, and when powered on, a beep can be heard
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