Description
The Electret Microphone Capsule is a compact, lightweight audio input device commonly used in cellphones, laptops, and embedded systems for detecting sound. It operates using electrostatic capacitor technology, eliminating the need for an external bias voltage thanks to its permanently charged electret diaphragm.
This specific model (CEM-C9745JAD462P2.54R) is ideal for DIY audio projects, sound detection circuits, voice-activated systems, or even Arduino-compatible audio visualization tools like LED VU meters, clap switches, and voice-controlled robots.
✅ Key Features
Omnidirectional sound pickup pattern
No polarizing voltage required – built-in electret charge
Compact size – fits easily into small enclosures
Wide frequency response for general audio detection
⚙️ Standard 2.54 mm pin pitch – breadboard & perfboard compatible
Sensitive enough for voice, clap, and ambient noise detection
Technical Specifications
Parameter Value
Model CEM-C9745JAD462P2.54R
Type Electret condenser microphone
Directionality Omnidirectional
Sensitivity -45 dB ± 3 dB
Frequency Response 50 Hz – 12,000 Hz
Impedance ≤ 2.2 kΩ
Operating Voltage 2V DC (typical)
Signal-to-Noise Ratio ≥ 58 dB
Max Input SPL 120 dB
Dimensions 9.7 mm (D) × 4.5 mm (H)
Pin Spacing 2.54 mm
Output Type Analog (capacitor-coupled)
Package Includes
1 × Electret Microphone Capsule (CEM-C9745JAD462P2.54R)
Applications
Voice recognition modules
️ Audio level detection (VU meter, sound-activated lights)
Robotics (sound-controlled motion)
Remote monitoring
Audio recording projects
Clap switch or voice switch modules
Resources
Datasheet (SparkFun)
Example Project – Audio LED Control
FAQ
Q1: Can I use this microphone with Arduino or ESP32?
✅ Yes! It works with most microcontrollers when paired with a preamp (like LM386 or op-amp).
Q2: Is it analog or digital output?
️ Analog – you’ll need to amplify and filter it for ADC use.
Q3: Can it detect claps or voice?
Yes, it’s very sensitive to sudden noises and voice input.
Q4: Is a preamp required?
️ For precise sound level detection, yes – use with op-amps like LM358 or LM386.
Meta Title
Electret Microphone Capsule (CEM-C9745JAD462P2.54R) – Sound Sensor for Arduino & Audio Projects | Robotech Shop BD
Meta Description
Buy electret microphone capsule (CEM-C9745JAD462P2.54R) online in Bangladesh. Ideal for audio input, sound detection, clap switch, and Arduino voice control. Datasheet & projects included.
