Questions tagged [buzzer]

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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 ...
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90 views

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 ...
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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 ...
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1 vote
1 answer
108 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 ...
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2 votes
3 answers
394 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 ...
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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? ...
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1 answer
88 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 ...
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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 ...
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2 votes
1 answer
106 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 ...
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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 ...
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1 vote
2 answers
264 views

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 ...
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1 answer
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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 ...
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1 vote
1 answer
92 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) : ...
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2 answers
106 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
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6 votes
2 answers
2k 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 ...
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2 answers
226 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 ...
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1 vote
1 answer
179 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 ...
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1 answer
610 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 ...
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1 answer
161 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. ...
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0 votes
1 answer
51 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 ...
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3 votes
2 answers
254 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 ...
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1 answer
1k 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 ...
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