9*7 MM Microphone Electret Microphone with 2 Pin – KSH 70 at HIMA TRONICS Mombasa – Top quality sensors. Best electronics in Kenya. Shop now for Arduino, ESP32, sensors and IoT devices.
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9*7 MM Microphone Electret Microphone with 2 Pin

SKU: HMJ677 Category: Sensors
KSH 70.00
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Product Description

9x7mm Electret Microphone with 2 Pin

= Compact Electret Condenser Microphone Cartridge =

The 9x7mm Electret Microphone is a compact, highsensitivity condenser microphone cartridge featuring a builtin FET amplifier and 2pin interface. This smallform-factor microphone delivers clear audio capture for voice, sound, and acoustic detection applications with Arduino, ESP32, and other microcontroller projects.

Builtin FET preamplifier for high sensitivity audio capture
Requires 2-10V DC power through load resistor (2.2kΩ typical)
Polarity matters - connect positive pin to power, negative to ground

= Technical Specifications =

ParameterValue
Dimensions9mm x 7mm
TypeElectret Condenser
Polar PatternOmnidirectional
Sensitivity-42dB ±3dB
Frequency Range50Hz - 20kHz
Impedance≤2.2kΩ
S/N Ratio≥58dB
Supply Voltage2V - 10V DC
Current Consumption≤0.5mA
Operation Temp-20°C ~ 70°C
Pin Configuration2 pins (Positive + Negative)
PolarityPositive pin marked (red or "+")

= Key Features =

High Sensitivity - Clear audio capture for voice and sound

Builtin FET Integrated amplifier for strong output signal

Omnidirectional - Captures sound from all directions

Small Footprint - 9x7mm size for compact projects

Wide Voltage Range 210V DC operation for flexibility

Low Power - ≤0.5mA current consumption

Simple Interface 2pin connection for easy integration

== Applications ==

  • Voice recording and audio capture
  • Sound detection and monitoring
  • Clap-activated circuits and projects
  • Audio visualizers and reactive lighting
  • Voice command and recognition
  • Security and surveillance systems
  • Wearable electronics
  • Phone and communication devices

= Wiring Guide =

Microphone PinConnectionDescription
Positive (+)3.3V or 5V (through 2.2kΩ resistor)Power supply with bias resistor
Negative (-)GNDCommon ground
Signal OutputAnalog Pin (A0)Connect at resistor junction point
Typical circuit: Connect VCC→2.2kΩ resistor→Microphone Positive→Output to ADC
Output signal is AC waveform centered at ~VCC/2
Reverse polarity will damage the microphone

= Typical Connection Circuit =

VCC (5V) ── 2.2kΩ Resistor ──┬── Microphone (+) ── Output to Analog Pin

│

Microphone (-) ─── GND

Use 2.2kΩ bias resistor for 5V operation
For 3.3V use 1kΩ or 2.2kΩ resistor
Add 10µF capacitor in series for AC-only audio output

= Arduino Test Code =

int micPin = A0;

int micValue = 0;

void setup() {

Serial.begin(9600);

}

void loop() {

micValue = analogRead(micPin);

Serial.println(micValue);

delay(10);

}

= Why Choose This Microphone? =

High sensitivity and clear audio capture
Built-in amplifier for strong output
Compact size fits any project
Low power consumption
Easy to integrate with Arduino
Cost-effective audio solution

√ Works with 3.3V and 5V systems

√ Simple 2-pin connection

√ No additional amplifier required for basic use

√ Reliable and durable construction

√ Perfect for DIY sound projects

= Safety Precautions =

Connect with correct polarity - reverse polarity will damage
Do not exceed 10V supply voltage
Keep away from moisture and physical damage
Protect from electrostatic discharge (ESD)
Handle with care - sensitive membrane
For longer connections, use shielded wire to reduce noise
For clean audio, position mic away from vibration sources

= What's Included =

  1. 9x7mm Electret Microphone Cartridge

The 9x7mm Electret Microphone delivers highquality audio capture in a compact, easyto-use package. Perfect for voice, sound detection, and creative Arduino projects.

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