There are many kinds and specifications of buzzers. You need to know several parameters (voltage, current, driving mode, size, connection / fixing mode) first. Of course, more importantly, the sound you want (sound pressure, frequency)
Working voltage: electromagnetic buzzer from 1.5 to 24V and piezoelectric buzzer from 3V to 220V are feasible, but generally piezoelectric buzzer is recommended to have a voltage of more than 9V to obtain large sound
Current consumption: depending on the voltage, the electromagnetic type can range from tens to hundreds of milliamperes. The piezoelectric type saves more power. A few milliamperes can operate normally, and about three times the current is consumed at the moment when the buzzer is started,
Driving mode: both buzzers have self-excited type, which can sound as long as direct current (DC) is connected, because the driving circuit has been built in the buzzer. Because of different action principles, the electromagnetic buzzer should be driven by 1 / 2 square wave, and the piezoelectric buzzer can have better sound output by using square wave.
Size:? The size of buzzer will affect the volume and frequency. The minimum of electromagnetic type is 7mm to the maximum of 25mm, and the piezoelectric type is 12mm to 50mm or more.
Connection mode: generally, there are dip, wire, SMD, large piezoelectric and locking screw
Sound pressure: the buzzer often takes the distance of 10cm as the test standard. Doubling the distance will attenuate 6dB, otherwise doubling the distance will increase 6dB. The electromagnetic buzzer can reach the level of 85dB / 10cm. The piezoelectric buzzer can be very loud. Most common alarms are made of piezoelectric buzzers.
For more information, please visit Dongguan Shengchang electronic official website or consult 13559793345. Shengchang electronics focuses on the production and R & D of buzzer and atomizer products, and is always committed to building safe, stable and certified products in line with national standards.