Condenser Microphone 2 Pins
🎤 2-Pin Electret Condenser Microphone – Compact Audio Sensor
The 2-pin condenser microphone (electret type) is a compact, low-power audio input sensor widely used for capturing sound in voice recognition, sound-activated circuits, and audio recording applications. It works by converting sound waves into electrical signals, making it ideal for Arduino, ESP32, or Raspberry Pi sound detection projects.
⚙️ Technical Specifications
| Parameter | Specification |
|---|---|
| Type | Electret condenser microphone |
| Pins | 2 (Positive and Ground) |
| Diameter | ~6mm – 10mm (varies by model) |
| Operating Voltage | 1.5V – 10V (typical: 2V–5V with bias resistor) |
| Impedance | ~2.2kΩ |
| Sensitivity | –44 dB (±3 dB @ 1 kHz, 0 dB = 1V/Pa) |
| Frequency Range | 20 Hz – 20 kHz (standard range) |
✅ Key Features
🎧 Captures sound with decent sensitivity
🔌 Simple 2-pin connection (easy to interface)
🔊 Used for voice triggers, audio sensing, and detection
🧪 Ideal for use with LM386, sound sensors, or microcontroller ADC pins
🛠️ Wiring Guide (for Arduino)
To use the raw microphone, you’ll need:
Bias resistor (e.g., 10kΩ to VCC)
Coupling capacitor (e.g., 10µF)
Connect output to an analog pin on Arduino
Or use with audio amplifier module (LM386) for sound detection.