The model number **AVH-25LSFE1302604** refers to a specific variant of a **rotary encoder** or a **position sensor**, often used in automotive infotainment systems, household appliances (like washing machines or microwaves), and industrial control panels. Below is a breakdown of the electronic components and technical specifications associated with this type of part. --- ### 1. Component Identification This part is a **mechanical incremental rotary encoder**. Its primary function is to convert the physical rotation of a knob into digital electrical signals that a microcontroller can interpret to increase or decrease values (volume, temperature, time). ### 2. Technical Specifications Typical characteristics for the **AVH** series include: | Feature | Specification (Typical) | | :--- | :--- | | **Type** | Incremental / Contacting | | **Output** | 2-bit Gray Code (Phase A & B) | | **Resolution** | 12 to 24 pulses per 360° rotation | | **Switch Function** | Integrated Momentary Push-Switch | | **Operating Voltage** | 5V DC (Logic Level) | | **Rotational Life** | 15,000 to 30,000 cycles | | **Mounting Type** | Through-hole (PCB Mount) | --- ### 3. Pinout Configuration Most parts in this series feature a **5-pin layout**: 1. **Phase A (Signal):** Provides the first pulse for direction sensing. 2. **Common (Ground):** The center pin for the encoder signals. 3. **Phase B (Signal):** Provides the second pulse (offset by 90°). 4. **Switch Terminal 1:** For the "push-to-select" button. 5. **Switch Terminal 2:** For the "push-to-select" button. --- ### 4. Working Principle The device operates on the **Quadrature Encoding** principle: * As the shaft turns, internal metallic contacts brush against a coded disc. * If Phase A leads Phase B, the system detects **clockwise** rotation. * If Phase B leads Phase A, the system detects **counter-clockwise** rotation. * The **"1302604"** suffix usually denotes specific physical dimensions, such as the shaft length (e.g., 13mm or 26mm) and the torque/detent feel (how "clicky" the knob feels). --- ### 5. Common Applications * **Car Audio:** Volume control and menu navigation. * **White Goods:** Selection dials on ovens and washing machines. * **Test Equipment:** Adjusting voltage or frequency on oscilloscopes.