Electromagnetic buzzer: below to introduce the role of the buzzer
Electromagnetic buzzer: The following is an introduction to the function of the buzzer.
The buzzer is an electronic sounder with an integrated structure, powered by DC voltage, and is widely used in computers, printers, photocopiers, alarms, Electronic toys, automotive electronic equipment, telephones, timers and other electronic products are used as sounding devices.
1. Buzzer is used in all aspects of our life, buzzer application range: computer industry (motherboard buzzer, chassis buzzer, computer buzzer), printer (control panel buzzer), copier, alarm industry (alarm buzzer, alarm buzzer), electronic toys (music buzzer), agriculture, automotive electronic equipment industry (car buzzer, reversing buzzer, car buzzer, motorcycle buzzer), telephone (environmental buzzer), timer, air conditioning, medical equipment and other electric sound industry, environmental monitoring.
2. The sound of the buzzer is unacceptable to many people, and it feels very harsh. The multivibrator is composed of transistors or integrated circuits. When the power is turned on (1.5~15V DC working voltage), the multivibrator vibrates and outputs 1.5~2.5kHZ audio signal, the impedance matcher drives the piezoelectric buzzer to sound, the piezoelectric buzzer is made of lead zirconate titanate or lead magnesium niobate piezoelectric ceramic material, the ceramic sheet is plated with silver electrodes on both sides, polarized and aged, and then bonded with brass sheet or stainless steel sheet.
3. There are many precautions for the use of the buzzer. The buzzer cannot be used as a crystal receiver, because there is an oscillation circuit inside the buzzer, which will drive the internal miniature horn to emit a buzzer after power on. The buzzer is not only a small horn, but also two buzzers, one with a built-in oscillator. One requires an external oscillator, that is, ordinary miniature speakers, the one without an oscillator, cannot be used, because its resistance is generally about 32 ohms, and there are also 8 ohms or 16 ohms, which are low impedance, so they cannot be used.
Electromagnetic buzzer: Buzzer detection method
Judging whether the buzzer is good or bad can be done by two detection methods: one is to use a multimeter to detect the resistance value to judge whether it is good or bad, and the operation is simple and convenient; Another way is to use DC stabilized power supply to judge whether it is good or bad by listening to the sound, accurate and reliable.
Check the buzzer with a multimeter. Before checking the buzzer, identify the positive and negative pins according to the mark on the buzzer to be tested to provide a reference standard for buzzer detection. Use a digital multimeter to test the buzzer below And set the gear knob of the digital multimeter at 200 ohms. The test method is shown in the figure.
Note: Under normal circumstances, the resistance between the positive and negative pins of the buzzer should have a fixed value (usually 8 or 16). When the stylus touches the buzzer pin instantaneously or intermittently, the buzzer will squeak. It is recommended that if the measured resistance between the pins is infinite and there is no or no sound during detection, the buzzer is damaged.
Xiaobian will explain here first today. Thank you for watching. I hope the above explanation will be helpful to you. If you need to purchase buzzers, you can consult our manufacturer.
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