What Are Audio Products?
Audio products encompass components that generate, detect, or process sound in electronic systems. The category includes buzzers (piezoelectric and magnetic), speakers, microphones (MEMS and electret), audio amplifier ICs, headphone jacks, and ultrasonic transducers. These components serve applications from simple alarm indicators to high-fidelity audio systems and ultrasonic range sensing. LCSC Electronics stocks 8,000+ audio component SKUs from 100+ manufacturers.
Audio Products — Definition and Sub-Categories
Audio components are transducers and circuits that convert between electrical signals and sound waves. Sound output devices (speakers, buzzers) convert electrical energy to acoustic energy. Sound input devices (microphones) convert acoustic energy to electrical signals. Audio ICs amplify, filter, and process these signals.
|
Sub-Category |
Function |
Key Parameters |
|
Buzzers (Piezo) |
Generate alert tones via piezoelectric vibration |
Frequency, SPL (dB), voltage, drive type (active/passive) |
|
Buzzers (Magnetic) |
Generate tones via electromagnetic coil and diaphragm |
Frequency, SPL, voltage, mounting type |
|
Speakers |
Reproduce audio across frequency range |
Impedance (Ω), power (W), frequency response, size |
|
Microphones (MEMS) |
Miniature digital/analog sound capture |
Sensitivity (dBV), SNR, frequency response, interface |
|
Microphones (Electret) |
Analog sound capture, omnidirectional or directional |
Sensitivity, impedance, frequency response, size |
|
Audio ICs / Amplifiers |
Amplify audio signals to drive speakers |
Output power (W), THD, supply voltage, class (AB/D) |
How to Choose: Audio Products Selection Guide
For simple alarm/notification sounds, active buzzers are easiest — just apply voltage for a fixed-frequency tone. For custom tones or melodies, use passive buzzers driven by PWM from a microcontroller. For voice or music reproduction, select speakers by impedance (typically 4Ω or 8Ω), power handling, and physical size. For sound capture, MEMS microphones offer smaller size and digital output; electret microphones are cheaper and simpler for basic applications. Always pair speakers with an appropriate amplifier IC matched to the speaker’s impedance and power rating.
Audio Products Comparison
|
Component |
Output Type |
Key Spec |
Typical Use |
Price (Qty 10) |
|
Active Buzzer (5V) |
Fixed-frequency beep |
85 dB @ 10cm |
Alarm, notification |
$0.10–$0.30 |
|
Passive Buzzer |
Frequency via PWM |
80–85 dB |
Melodies, variable tones |
$0.05–$0.20 |
|
8Ω 28mm Speaker |
Full audio range |
0.5–1W |
Voice prompts, alerts |
$0.30–$1.00 |
|
MEMS Microphone |
Digital audio capture |
-26 dBFS, 65 dB SNR |
Voice commands, recording |
$0.20–$0.80 |
|
PAM8403 Amplifier |
Stereo Class D amp |
2×3W, 5V supply |
Portable speakers, USB audio |
$0.15–$0.30 |
Why Source Audio Products from LCSC Electronics
LCSC stocks 8,000+ audio component SKUs from 100+ manufacturers. The catalog covers everything from $0.05 passive buzzers to MEMS microphone arrays and Class D amplifier ICs. Asian manufacturers like Star Micronics, KELIKING, and PUI Audio offer quality components at competitive prices. Most audio components are available from quantity 1.
Frequently Asked Questions
Q: What is the difference between an active and passive buzzer?
An active buzzer has a built-in oscillator — apply DC voltage and it produces a fixed-frequency tone. A passive buzzer has no internal oscillator — you must drive it with a square wave (PWM) to produce sound, but you can control the frequency to play different notes and melodies. Active is simpler; passive is more versatile.
Q: What is a MEMS microphone?
A MEMS microphone uses a micro-machined silicon diaphragm to detect sound. Compared to traditional electret microphones, MEMS mics are smaller, more consistent in manufacturing, more resistant to temperature and vibration, and available with digital (PDM/I2S) outputs. They’re standard in smartphones, laptops, and smart speakers.
Q: How do I choose an audio amplifier IC?
Match the amplifier to your speaker: choose output power equal to or slightly above the speaker’s rated power, and verify impedance compatibility (4Ω or 8Ω). Class D amplifiers are most efficient (85–95%) and best for battery-powered devices. Class AB offers lower distortion for audiophile applications but wastes more power as heat.
Q: What does SPL mean for buzzers?
SPL (Sound Pressure Level) measures buzzer loudness in decibels (dB), typically specified at a distance of 10 cm. An 85 dB buzzer is loud enough for most alert applications. For outdoor or noisy industrial environments, choose buzzers rated 95+ dB.
Q: Can I use a speaker as a microphone?
Technically yes — a speaker is a transducer that works in reverse, but the frequency response and sensitivity will be poor. For any practical application, use a proper microphone (electret or MEMS) designed for sound capture.
Q: Does LCSC sell ultrasonic transducers?
Yes. LCSC stocks ultrasonic transducers (typically 40 kHz) used for distance measurement (like HC-SR04 modules) and object detection. They’re available as matched transmitter/receiver pairs or as combination units.