Audio Component
Audio parts are electromechanical: speakers and buzzers turn voltage into vibration; microphones turn vibration into voltage. Together with amplifiers and codecs, they form a product's sound chain.
Different sound components use different mechanisms. A dynamic speaker moves a coil and cone; a piezoelectric sounder flexes a ceramic-and-metal diaphragm. A capacitive microphone detects sound-induced changes in capacitance and uses electronic circuitry to read the tiny signal. The driver, bias and signal format must suit the chosen component.
In plain terms
Tiny diaphragms that dance with the music. Electricity wiggles them, air molecules carry the wiggle to your ears.
Also called: microphone.
Why designers use it
- Confirm a button press with a beep.
- Play music, voice prompts, and notifications.
- Capture voice for assistants or recording.
- Provide alarm tones in safety equipment.
Best for
- User feedback
- Voice capture
- Music playback
- Alarm signalling
When not to use it
- Where ambient noise dominates — a haptic buzz may be a better cue.
Common mistakes
- Treating an externally driven sounder like a buzzer with its own oscillator.
- Connecting a speaker load directly to a logic output without checking the required driver and load limits.
- Assuming a microphone's output format, bias or pinout from its appearance.
Where you will find it
- A piezoelectric buzzer with a built-in oscillator can make a fixed tone from an appropriate DC supply. An externally driven sounder instead needs a changing drive signal.
- TI's documented electret preamplifier biases a capsule and amplifies its small signal. Its bill of materials specifies POM-3535P-3-R. The bias circuit is part of the design, not an optional substitute for microphone power.
- An analog MEMS microphone feeds an analog signal chain; a digital model can send PDM or I²S data to compatible processing circuitry.
A short history
Electronic sound components include distinct families rather than one interchangeable 'buzzer'. Electromagnetic sounders move a diaphragm with a changing magnetic field; dynamic speakers move a coil and cone; piezoelectric sounders bend a ceramic-and-metal diaphragm. Integrating an oscillator makes a device sound from DC power, while an externally driven transducer needs a changing signal. That distinction matters when choosing a part.
Good to know
- Two similar-looking sounders may need different inputs: one contains its own oscillator, while another relies on your circuit to generate the waveform.
- A microphone package can contain both a tiny mechanical sensing element and the electronics needed to make its signal usable.