Buzzer 5V frequency range and tone generation

TECHNICAL SUPPORT Sensors & Modules
1

Customer:

I’m interested in information about the Buzzer 5V. According to the datasheet, the sound intensity is specified in decibels, but I want to know what frequency range the buzzer can generate. I’m also curious: for buzzers with an oscillator circuit, is it possible to generate tones at different frequencies, and if so, how?

Original message (Croatian)

U datasheetu je priložen podatak kolika je jačina zvuk u decibelima, mene zanima koliki je frekvencijski raspon tonova koje zujalica može generirati. Zanima me još, ako usput znate, općenito kada su u pitanju zujalice sa oscilatorskim krugom da li je i tada moguće generirati tonove različite frekvencije, te ako mogu kako se to radi.

Originally submitted via email support on 6 September 2017. Migrated to the forum for community visibility.

2

Soldered Support:

Buzzers (piezo) typically operate at frequencies between 1-5 kHz. They can also work at around 100 kHz for ultrasonic applications. They will work at other frequencies, but the intensity is significantly lower.

To change the frequency, you need to generate a square wave signal (similar to PWM) with a 50% duty cycle and vary the frequency of that signal to obtain different tones.

Original message (Croatian)

buzzer(piezo) većinom radi na frekvencijama 1-5kHz. Može raditi i na oko 100kHz za ultrazvučne primjene. Radi i na drugim freq, ali je intezitet znatno manjil

Za mijenjanje frekvencije trebat ćete napraviti pravokutni signal(nešto kao PWM) s 50% duty cycle te mijenjati frekvenciju tog signala kako biste dobili različite tonove.