The **POM-2735P-R** is a high-sensitivity, omnidirectional electret condenser microphone (ECM) capsule. These components are widely used in consumer electronics for audio recording and voice transmission due to their compact size and reliability. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and physical characteristics of the POM-2735P-R: | Parameter | Specification | | :--- | :--- | | **Directionality** | Omnidirectional (picks up sound from all sides) | | **Sensitivity** | -35 ± 3 dB (0dB = 1V/Pa @ 1kHz) | | **Standard Operating Voltage** | 2.0 V | | **Maximum Operating Voltage** | 10.0 V | | **Current Consumption** | 0.5 mA (Max) | | **Impedance** | 2.2 kΩ | | **Frequency Range** | 20 Hz – 20,000 Hz | | **Signal-to-Noise Ratio** | > 60 dB | | **Dimensions** | 6.0 mm (Diameter) x 2.7 mm (Height) | | **Connection Type** | Solder Pads (Through-hole/Leadless) | --- ### 2. Functional Description The POM-2735P-R operates on the principle of a **variable capacitor**. It consists of a thin, metallized diaphragm placed close to a backplate that holds a permanent electrostatic charge (the "electret"). - **Acoustic to Electric Conversion:** Sound waves vibrate the diaphragm, changing the capacitance between it and the backplate. - **Internal JFET:** Because the signal produced by the capacitor is extremely high impedance, the capsule contains an internal **Junction Field Effect Transistor (JFET)**. This transistor acts as an impedance converter, buffering the signal so it can be transmitted over wires without significant loss. --- ### 3. Application Circuit To use this part in an electronic circuit, it requires a "bias voltage" supplied through a resistor. ```c VCC (2.0V - 10V) | [R_load: 2.2k ohm] | +----[C_output: 1uF]----> Audio Signal Out | [POM-2735P-R] | GND ``` --- ### 4. Common Applications * **Telecommunications:** Smartphones, headsets, and hands-free car kits. * **Computing:** Laptops, webcams, and USB microphones. * **IoT Devices:** Voice-activated assistants and smart home sensors. * **Security:** Sound-triggered alarms and surveillance audio monitoring. ---