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Questions tagged [buzzer]

A buzzer is an audio signaling device, usually piezo-electric.

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How to select resistors for MOSFET Gate terminal?

I need to design Buzzer circuit. While i searching for reference design in google i saw one design based on buzzer, Here they drive a buzzer by using MOSFET. Here My doubt is, they used R23 & R24 ...
Kuralmozhi's user avatar
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Momentary push button switch to mute an alarm buzzer

I'm working on a circuit that needs to trigger an alarm buzzer (external dry contact trigger). It should have a facility to mute the buzzer while the alarm is still on and turn it off when the ...
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Active buzzer PNP transistor

I'm making a project with an Arduino using an active buzzer 5v. I saw many forums with mixed comments about using an active buzzer straight to the I/O pins without any current limiting. Then I also ...
Kokachi's user avatar
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Any advice to remove the buzzer? [closed]

This is the control panel of laundry unit. The black plastic objects soldered to the board are buzzers right? Can I disconnect soldered legs via careful pliers? I don’t have a soldering iron. Only by ...
Gator's user avatar
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5 answers
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12V piezo buzzer not working using ESP32

I'm trying to make my buzzer sound when hooked up to 12V and a MOSFET in between but I'm perfectly failing. I'm using GPIO15 of my ESP32 WROOM to send a PWM signal to the MOSFET but nothing really ...
Cyril Schmidiger's user avatar
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Control buzzer with GPIO

Edit: Realised Silly mistake, I have the emitter and collector swapped on my PCB :( sorry about that. I'm trying to control a magnetic buzzer indicator using an STM32 MCU. I have the circuit below ...
tagy22's user avatar
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135 views

Maximum voltage/current on a passive 8 ohm buzzer

I have a buzzer with: 8 ohm 1 watt rated power Resonant frequency: 700/600 Hz In order to make it sound, should I apply a PWM with 700/600 Hz, and turning ON and OFF? What is the maximum voltage? ...
da_bb's user avatar
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3 votes
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How to interface buzzer with LED in this circuit

Below is the circuit where I want to integrate the buzzer with the red LED. The task is to add the buzzer, where the red LED is, in such a way that when the red LED (which is driven by the LED driver)...
Melvo's user avatar
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Buzzer circuit sanity check

I am trying to establish if this buzzer circuit going to perform as expected MPU: STM32 running at 3.3V, input will be coming from a GPIO pin that has a timer channel on it Buzzer: A passive magnetic ...
Charles's user avatar
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3 answers
629 views

How does the KLJ-5030 buzzer work?

I need a small package buzzer to replace the regular piezo buzzer which is too big for my design, so I tried the KLJ-5030. I tested by applying 3V to positive pin and GND to negative pin and heard a ...
Unicorn's user avatar
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Add buzzer to multimeter

How can I add a buzzer to my EverStart Digital Multimeter 10711WDI circuit board, so that it buzzes when there is continuity?
Aye kay's user avatar
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Energy consumption after removing a part from a PCB

Does removing the buzzer chip from a PCB reduce the energy the PCB uses? Is it save to remove the buzzer? It's an FMQ.
Tobias Bättig's user avatar
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Buzzer with LEDs [closed]

Does anyone know a basic circuit so I can have a switch which activates a buzzer and a LED strip run off a battery?
Emz's user avatar
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1 answer
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Driving an active buzzer with an ESP32

I'm looking to drive an active magnetic 3V buzzer with an ESP32 pin through an N-Channel MOSFET as follows: I'm not sure if the 100 Ohm resistor is needed and whether the value is correct. Buzzer ...
Maxim Kachurovskiy's user avatar
2 votes
1 answer
139 views

BPT intercom contacts [closed]

I live in a condominium. There is a door intercom system (see picture 1). The intercom is made by BPT company (Italy), model E/272 (see diagram in picture 2). Since there is too much noise, I can't ...
NickRucunas's user avatar
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Using a tilt sensor with NPN transistor

i'm making a fall prevent circuit and i want to make sure that this circuit is correct which i made I would like to check because I don't have enough budget and time to buy many other parts and this ...
KimJiHoon's user avatar
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LRA motor driver activity appears to be corrupting I2C commands to another device

I'm working on a device that uses an STM32L552ZET6Q, two DRV2605L motor drivers configured for LRA PWM output, and two BNO055 IMU units configured for IMUPLUS mode. Each of the four chips is connected ...
E.HP.S's user avatar
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1 answer
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Is this buzzer circuit correct?

Need to use an ESP32 to run a buzzer datasheet The source current maximum per pin of the esp32 is 20mA However I need to drive an active buzzer with 3V@30mA, so I decided to use an N-MOSFET (2N7002 ...
Eqkaier's user avatar
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1 vote
3 answers
173 views

How to add buzzer in this circuit?

I'm making AC detector using bjt amplifier below is my circuit. When it detects AC signal it will show result in LED and I want to add buzzer(3V) for show result in LED and buzzer ( 3V) so I ...
Heroz's user avatar
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1 answer
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Proteus design buzzer quiz circuit

I am trying to design a 12-people buzzer quiz game. I just want to use LEDs and AND and NOT gates, using one switch for reset. The problem is that after designing it all the odd LEDs or even LEDs ...
mia's user avatar
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2 answers
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Mechanical buzzer heard on AM radio

If I connect this little mechanical buzzer to a 3V supply, then hold my AM radio close to it with the radio tuned so I can't hear any stations, I can hear the buzzer on the radio. If I turn up the ...
Annette Gates's user avatar
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How to remove Noise from the buzzer?

It is a simple water level indicator using BC547 and a buzzer. It works on a 9v/12v battery. Its switch is placed beside the motor pump's switch. Whenever the motor switch is on there is a noise ...
Rafi Md.'s user avatar
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2 answers
203 views

Adding a buzzer to an existing LED

I have a set top box. It has a 3 mm green LED (on the front panel) that lights up when I connect the dish coax cable (signal LED). I measured the voltage across the LED. It has 0 V when the dish cable ...
user141178's user avatar
1 vote
1 answer
137 views

Want to create an alarm that senses 12 V and 240 V

On my boat I would like a warning buzzer to sound if the battery charger is on and the engine batteries are not isolated. Because if you start the engine with the battery charger on, the diodes in the ...
Lance Kneeshaw's user avatar
4 votes
3 answers
2k views

Which flyback diode for magnetic buzzer

I am a novice, and I'm playing around with SMD magnetic buzzers. For instance, the CUI CMT-322-65-SMT-TR. In the datasheet they recommend something like this: After some Googling I learnt the diode ...
peanutman's user avatar
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159 views

I need to make a circuit that activates an SOS buzzer, what are the components that I need? [closed]

I have a project in my college that requires me to make an SOS (... --- ...) buzzer without any IC's, what are the possible components that I can use for the delay between the morse code signals? ...
HoleWizard's user avatar
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1 answer
266 views

Would this circuit work for driving an internal buzzer?

A quick note, I had asked a similar question around driving an external buzzer previously: Driving external piezo buzzers This is a question in regards to driving an internal buzzer, so not a ...
Hasman404's user avatar
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Driving external piezo buzzers

I am planning on using the following buzzer in my design ( SMACT-25-P15): https://uk.rs-online.com/web/p/piezo-buzzer-components/8055272/ It says it requires external circuitry for operation. I have ...
Hasman404's user avatar
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2 votes
1 answer
333 views

How large is a piezo buzzer's deformation?

For a standard run-of-the mill piezo buzzer (as in the image below), what order of magnitude would the deformation be (compared to 0V) that occurs when driving it within its normal operating ...
Larsupial's user avatar
6 votes
3 answers
1k views

Why is my infrared transmitter/receiver circuit not working?

I tried to make this circuit, but it didn't work like it should. I thought my connections were right but maybe it not. This is the circuit diagram: This is my layout. (I used other components as ...
Nurrrr's user avatar
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1 vote
2 answers
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How do I transfer this circuit to stripboard?

I want to construct this circuit because it look worth to try. However, I am not sure about connection between the components. This is the components placement that I tried, does it make sense? Please ...
Nurrrr's user avatar
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0 votes
1 answer
336 views

Connecting a bulb and a buzzer onto the same output of a relay

I am currently doing a project to light up a bulb and a buzzer at the same time. This circuit is an Arduino UNO which is connected to a relay to light up a bulb and the buzzer. Can a 40 watt bulb and ...
Steve Kush's user avatar
1 vote
1 answer
246 views

How does this buzzer volume regulation work?

I've found a usage of a buzzer with volume regulation that I hadn't seen before. Here's the schematic: Timers PWM are activated like this (Atmel MCU) : ...
Singed's user avatar
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2 answers
222 views

Purpose of the capacitor which is placed in parallel to collector and emitter of the transistor?

Can someone explain the purpose of the C469 capacitor, which placed in parallel to collector and emitter of the transistor? Edit: Sorry for the mistake, C469 is parallel to CE
jackran's user avatar
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10 votes
2 answers
5k views

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 ...
EttoreP's user avatar
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2 answers
746 views

What makes an active buzzer oscillate?

All I can find online are descriptions on how active buzzers have an oscillator built in so that you just need to feed them a DC and they buzz at the frequency set by such oscillator, but I haven't ...
palako's user avatar
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1 answer
861 views

Where to put a buzzer so that it goes off when there is light (and should stop when there is dark)

I've successfully created (and breadboarded) this circuit: simulate this circuit – Schematic created using CircuitLab I cannot figure out where to put a buzzer so that it goes off when the LED ...
wajmo's user avatar
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1 answer
2k views

Buzzer not buzzing in proteus 7.7v - used ic555

I am trying to simulate a mosquito repellent in Proteus v7.7. It uses an NE555 in astable mode. My problem is that I cannot hear the buzzer buzzing. I checked my circuit and everything seems correct ...
SWETHA CHILVERI's user avatar
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1 answer
484 views

3.6 Vo-p rated buzzer on 5 V Arduino circuit

As a small buzzer to output simple audio, I am considering the Jiangsu Huaneng Elec MLT-5020. Other buzzers of that size are also an option, as long as their footprint isn’t much bigger than 5×5 mm. ...
feklee's user avatar
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0 votes
1 answer
155 views

No display at all tests, but shows continuity [closed]

My multimeter buzzer is ok and sounds when continuity is checked. However, no display on the LCD. Also, no numbers are showing in every tests voltage, resistance, etc. I have replaced the battery and ...
Thang Tons's user avatar
3 votes
2 answers
560 views

Driving a tiny speaker via pwm, amplified with a BJT - in reverse?

I'm playing around with a micro and a small buzzer (passive). I built up an simple emitter-follower buffer to reduce the load on my uC, but I accidentally installed the transistor backwards on the ...
Brad Roy's user avatar
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1 answer
2k views

How to simulate Magnetic Transducer Buzzer (SMT8585-03H03LF) in LTspice- any model available?

I am adding a Magnetic buzzer into the design. Buzzer part number is SMT8585-03H03LF from Bestar electronics. Below are the specifications for quick glance. Is it possible to get a LTspice model for ...
user19579's user avatar
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0 votes
4 answers
768 views

How to turn on a 12 V buzzer when transistor is OFF in the given circuit using minimal components?

In the given circuit I need to add alarm circuitry where the 12 V buzzer is ON when the relay/transistor is OFF. Please guide me on how to connect the 12 V buzzer with minimal additional components.
Angom's user avatar
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