The **AZ2B-R** is a specific type of **Rotary Pulse Switch** (also known as a rotary encoder switch) commonly used in consumer electronics for volume control, menu navigation, and parameter adjustments. Below is a detailed breakdown of its electronic components, specifications, and pin configuration. --- ### 1. General Specifications The AZ2B-R is designed for low-power signal switching rather than high-power load switching. | Feature | Specification | | :--- | :--- | | **Component Type** | Incremental Rotary Encoder | | **Output Type** | 2-Phase A/B (Quadrature) | | **Push-Switch Function** | Integrated (Momentary) | | **Rated Voltage** | 5V DC | | **Rated Current** | 10mA | | **Operating Life** | 15,000 to 30,000 cycles | | **Detents** | 12, 20, or 24 clicks per revolution | --- ### 2. Pin Configuration and Internal Parts The AZ2B-R typically features a **5-pin layout** (3 pins on one side for the encoder, 2 pins on the opposite side for the push-button). #### Pinout Table | Pin # | Label | Description | | :--- | :--- | :--- | | 1 | **Phase A** | Output signal for rotation direction sensing | | 2 | **Common (C)** | Ground (GND) connection for the encoder | | 3 | **Phase B** | Output signal (90° offset from Phase A) | | 4 | **Switch 1** | Terminal for the integrated push-button | | 5 | **Switch 2** | Terminal for the integrated push-button | --- ### 3. Key Electronic Components The internal construction of the AZ2B-R consists of several critical mechanical and conductive parts: 1. **Contact Rotor:** A metallic disc with a specific pattern of conductive and non-conductive areas. 2. **Contact Brushes:** Spring-loaded metal wipers that slide across the rotor to complete or break the circuit. 3. **Detent Mechanism:** A spring and ball (or notched wheel) that provides the physical "click" feeling. 4. **Momentary Switch:** A tactile dome switch located at the base of the shaft that activates when the shaft is pressed downward. --- ### 4. Logic and Signal Output The device uses **Quadrature Encoding**. By monitoring which phase (A or B) changes state first, the microcontroller can determine the direction of rotation. ```arduino // Example Logic (Arduino/C++ Concept) if (Phase_A_State != Last_Phase_A_State) { if (Phase_B_State != Phase_A_State) { // Rotated Clockwise } else { // Rotated Counter-Clockwise } } ``` --- ### 5. Application Circuit Requirements To use the AZ2B-R effectively in a circuit, you must include: * **Pull-up Resistors:** Usually 10kΩ, connected between the signal pins (A, B, and Switch) and VCC (5V/3.3V). * **Debouncing Capacitors:** 0.01µF to 0.1µF capacitors are recommended to filter mechanical "bounce" noise that occurs during rotation.