Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [buzzer]

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

36 questions
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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
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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 placeholders) What is wrong with my circuit? Is…
Nurrrr
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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 is a flyback diode, which prevents the transistor…
peanutman
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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 board. It worked great, although when I noticed my…
Brad Roy
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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) turns ON, the buzzer should turn ON. When the…
Melvo
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BPT intercom contacts

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 hear the buzzer when somebody from outside is…
NickRucunas
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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 conditions? Micrometers?
Larsupial
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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 buzzer, 5V rated, similar to this U4: An AO3400A…
Charles
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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 small crackling but not really sound (beep). The…
Unicorn
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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
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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 datasheet) to drive the buzzer on the low…
Eqkaier
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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 connected buzzer in series with LED but result is buzzer…
Heroz
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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 radio volume, the buzzer is amplified much louder…
Annette Gates
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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 engine alternator blow (been there, done…
Lance Kneeshaw
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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 ignore the random wire color. I also make…
Nurrrr
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