The **DOM-5246L-R** is a high-sensitivity, omnidirectional electret condenser microphone (ECM) component manufactured by **PUI Audio**. It is widely used in telecommunications, security systems, and portable electronics. --- ## 1. Technical Specifications The following table highlights the core electronic characteristics of the DOM-5246L-R: | Parameter | Specification | | :--- | :--- | | **Type** | Electret Condenser Microphone | | **Directional Characteristic** | Omnidirectional (360° pickup) | | **Sensitivity** | -46 ± 3 dB (0dB=1V/Pa at 1kHz) | | **Frequency Range** | 20 Hz ~ 20,000 Hz | | **Operating Voltage** | 1.5V to 10V (Standard: 2.0V) | | **Current Consumption** | Max 0.5 mA | | **Signal-to-Noise (S/N) Ratio** | > 60 dB | | **Output Impedance** | 2.2 kΩ | | **Mounting Type** | Through-hole (Solder Pads) | --- ## 2. Key Electronic Features ### A. Electret Condenser Technology The device uses a permanently polarized material (electret), eliminating the need for a high-voltage external power supply to charge the diaphragm. However, it still requires a small DC voltage to power the internal **FET (Field Effect Transistor)**. ### B. Internal Impedance Matching (FET) Because condenser capsules have extremely high impedance, the DOM-5246L-R includes an internal FET. This transistor acts as an impedance converter, transforming the high-impedance signal of the capsule into a low-impedance output (2.2 kΩ) suitable for standard audio pre-amplifiers. ### C. Omnidirectional Polar Pattern Unlike "cardioid" microphones that pick up sound from the front, the DOM-5246L-R is equally sensitive to sound from all directions. This makes it ideal for ambient noise sensing or conference devices where the sound source position may vary. --- ## 3. Typical Application Circuit To use this component, a simple bias circuit is required. A load resistor ($R_L$) is used to limit current and drop voltage to the FET. ```text Vcc (2.0V - 10V) | [ Rl: 2.2k ohm ] | +----------o Audio Output (via Capacitor) | [ DOM-5246L-R ] | GND ``` ### Components in the Circuit: 1. **Vcc:** The supply voltage (typically 2V). 2. **Load Resistor ($R_L$):** Typically 2.2kΩ. It determines the gain and operating point of the internal FET. 3. **DC Blocking Capacitor:** Usually 0.1µF to 10µF, placed on the output line to prevent DC voltage from entering the following amplifier stage. --- ## 4. Mechanical Design * **Dimensions:** Usually 6mm in diameter and 5mm in height (standard 6050 package size). * **Termination:** Two solder pads on the bottom. One pad is connected to the metal casing (Ground), which helps in reducing EMI/RFI interference.