Questions tagged [buzzer]

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66 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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2answers
85 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
6
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2answers
757 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 ...
0
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2answers
89 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 ...
1
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1answer
87 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 ...
0
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1answer
180 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 ...
0
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1answer
102 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. ...
0
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1answer
50 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 ...
3
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2answers
177 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 ...
-2
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1answer
698 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 ...