Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [piezo-buzzer]

A piezo buzzer contains a piezoelectric element combined with an in-built oscillator / driver to produce an audible sound. While the output frequency is fixed using them is as simple as applying a DC voltage within the specified range.

167 questions
60
votes
2 answers

"Remove After Washing" on Piezo Buzzer

Maybe this is a stupid question, but here goes: I just got a piezo buzzer and on the top there is a sticker that says "Remove After Washing". My question is why would I ever want to wash an electronic part? I have no idea. Is there some…
kmort
  • 862
  • 1
  • 7
  • 12
53
votes
2 answers

What's the third wire on a piezo buzzer?

Most piezos I've seen have just two connections, but this type has three. What's the third wire for?
Federico Russo
  • 9,658
  • 17
  • 68
  • 117
32
votes
1 answer

Active vs Passive Buzzer

I recently borrowed an Arduino Inland Basic Starter Kit. It includes an active and passive buzzer. What is the difference? I can hear a difference in sound when I use the tone() command. Anything else? How can I identify which one is which? Are…
shurup
  • 645
  • 2
  • 10
  • 21
21
votes
11 answers

What is the difference between a buzzer and a speaker and are there any other basic electric/electronic things that output sound?

I am playing with a speaker and a microcontroller and in some documentation the speaker is called buzzer. The assistant told us that is a mistake and we are dealing with a speaker. I am wondering what exactly is the difference between the two,…
yoyo_fun
  • 793
  • 1
  • 6
  • 17
13
votes
4 answers

Is there any way that the Arduino board can get damaged by using a buzzer without a resistor?

I want to use a standard piezo buzzer on one of the Arduino Uno's analog pins without the use of a resistor. Will connecting this be a problem for the Arduino board? Why?
Amith KK
  • 305
  • 1
  • 4
  • 11
12
votes
9 answers

How do you remove the buzzer from this PCB whose solder side is inaccessible?

(Click on an image to see in original size.) There is this buzzer in this UPS (uninterruptible power source) circuit. I want to remove it from this circuit because it make a lot of unnecessary noisy. Black-outs happen too much in my area.…
hkBattousai
  • 13,913
  • 31
  • 114
  • 190
11
votes
3 answers

How are electronic musical greeting cards made?

I remember that long time ago, when I was a kid (in the 80s) there was some electronic greeting cards that when open up, start playing simple tunes through a small piezo-electric speaker. A quick look at the board reveal a small black chip and some…
tigrou
  • 1,863
  • 4
  • 21
  • 31
11
votes
3 answers

What's the function of the diode in this driver connected to a piezo buzzer?

I can't remember the source of this image, but I found a similar image in an Ekulit catalog. One recommended circuit shows just a resistor in series with the piezo buzzer. But this one adds a diode. What's its function?
Federico Russo
  • 9,658
  • 17
  • 68
  • 117
10
votes
2 answers

Driving piezo buzzer from MCU pin

I'm looking for the right circuit to connect my piezo buzzer to MCU (STM8S in my case). I don't have a partnumber\datasheet for my particular buzzer, but I've found a number of similar schematics in datasheets: Some of them also have a protection…
artvolk
  • 203
  • 1
  • 2
  • 6
8
votes
2 answers

How does the component "alarm boost three pin inductor" make a piezo buzzer louder?

I have a small circuit working on 2xAA batteries (3V) with an MCU and a buzzer for alarm sound. I've already successfully used an active buzzer (with build-in driver oscillator) drived by an NPN transistor in on-off, and it worked fine. Now I've…
EttoreP
  • 181
  • 1
  • 5
8
votes
3 answers

Is this a proper way to connect a piezo speaker to MCU?

Is this a proper way to connect a piezo buzzer to microcontroller pin? Is there anything that could be improved in the sense of robustness and power consumption? How do i select D1?
miceuz
  • 5,523
  • 3
  • 39
  • 49
7
votes
3 answers

Piezoelectric Sensor and the ADC

I would like to hook up a piezoelectric sensor to my ATmega8 microcontroller via its ADC. The reason being is that I would like to use the sensor as a force sensor. I noticed that the harder I press it, the higher a voltage it delivers (but for a…
capcom
  • 5,882
  • 14
  • 48
  • 59
7
votes
7 answers

Lowering pitch sound of a piezoelectric buzzer

I have tried to drastically lower the pitch of a piezoelectric buzzer, but to no avail. All the piezo buzzers I have emit a very high pitched whistle-like tone. I've tried changing all the parameters of my pulse generator, i.e., frequency, duty…
Eddie
  • 99
  • 1
  • 5
7
votes
5 answers

Random time timer

I'm constructing a simple circuit that beeps a beeper on a given time interval, using a 555 timer. Is there any simple way to randomize the time on the 555 timer between two given intervals, say, any time between 30 seconds and two minutes? I'm not…
Chris
  • 617
  • 9
  • 15
7
votes
1 answer

Good explanations of audio piezo element behavior

Is there any description anywhere of how voltage, current, mass, momentum, and air interact in a typical audio piezo, and what sort of signal should be expected on the third pin of a three-terminal device (phase relationship with regard to drive,…
supercat
  • 45,939
  • 2
  • 84
  • 143
1
2 3
…
11 12