The **POM-3046L-R** is a high-performance, omnidirectional electret condenser microphone (ECM) capsule manufactured by PUI Audio. It is designed for general-purpose audio applications requiring a compact form factor and high sensitivity. --- ## 1. Technical Specifications The following table summarizes the primary electrical and physical characteristics of the POM-3046L-R: | Parameter | Specification | | :--- | :--- | | **Directional Characteristic** | Omnidirectional | | **Sensitivity** | -46 ± 3 dB (0dB=1V/Pa) | | **Frequency Range** | 20 Hz ~ 20,000 Hz | | **Rated Voltage** | 2.0 V | | **Operating Voltage Range** | 1.5 V ~ 10 V | | **Current Consumption** | Max 0.5 mA | | **Signal-to-Noise Ratio** | > 60 dB | | **Impedance** | 2.2 kΩ | | **Dimensions** | 6.0 mm (Diameter) x 3.0 mm (Height) | | **Connection Method** | Solder Pads (L-type) | --- ## 2. Key Features * **Omnidirectional Polar Pattern:** It picks up sound equally from all directions, making it ideal for ambient recording or devices where the sound source position varies. * **Wide Frequency Response:** With a range from 20Hz to 20kHz, it captures the full spectrum of human hearing. * **Compact Low-Profile Design:** The 3mm height allows it to fit into slim electronic enclosures (wearables, thin IoT devices). * **Standard Operating Voltage:** Compatible with most low-power integrated circuits and microcontrollers. --- ## 3. Typical Application Circuit Electret microphones require a "Bias Resistor" to operate. Below is a standard schematic representation: ```text Vcc (1.5V - 10V) | [ R_bias (2.2k) ] | +----------||----------> Audio Out (AC Coupled) | C_block (1uF) [ MIC ] | GND ``` ### Components in the Circuit: * **R_bias:** Supplies DC power to the internal JFET of the microphone. 2.2kΩ is the standard value for a 2V supply. * **C_block:** A capacitor (usually 0.1uF to 10uF) used to block the DC bias voltage from reaching the amplifier stage while allowing the AC audio signal to pass. --- ## 4. Common Applications 1. **Consumer Electronics:** Smart speakers, headsets, and digital cameras. 2. **IoT Devices:** Voice-activated sensors and security monitoring systems. 3. **Communication:** Hands-free kits and VoIP hardware. 4. **Industrial:** Sound level meters and noise detection modules.