The **JR-66-R** typically refers to a specific series of **Rotary Switches** or **Selector Components** often used in industrial controls, audio equipment, or testing devices. --- ### 1. Component Overview The JR-66-R is an electromechanical device designed to open or close electrical circuits by rotating a central shaft. It is characterized by its "R" suffix, which often denotes a specific mounting style (like PCB Right-Angle) or a "Round" shaft configuration. ### 2. Key Specifications | Feature | Typical Specification | | :--- | :--- | | **Component Type** | Rotary Selector Switch | | **Positions** | 2 to 12 positions (Adjustable) | | **Current Rating** | 0.3A to 1A at 125V AC / 30V DC | | **Contact Resistance** | < 50mΩ | | **Insulation Resistance** | > 100MΩ at 500V DC | | **Dielectric Strength** | 500V AC for 1 minute | | **Operating Temp** | -20°C to +70°C | --- ### 3. Internal Construction The electronic functionality of the JR-66-R relies on several core parts: * **Wiper (Common Terminal):** The central conductive plate that rotates. As you turn the knob, the wiper bridges the connection between the common pin and the output pins. * **Terminals (Pins):** Silver-plated or gold-plated brass pins. In the "R" variant, these are often bent at a 90-degree angle for edge-mounting on a Printed Circuit Board (PCB). * **Stator:** The fixed insulating base (usually phenolic resin or high-temp plastic) that holds the contact points in place. * **Detent Mechanism:** A spring-loaded ball or plate that provides the "click" feeling, ensuring the switch stops precisely at each electrical contact. ### 4. Typical Applications 1. **Audio Equipment:** Used as a source selector (e.g., switching between Phono, CD, and Aux). 2. **Instrumentation:** Used for range selection on multimeters or analog testing gear. 3. **Industrial Panels:** Mode selection (Off/Manual/Auto). --- ### 5. Identification Schematic When wiring or troubleshooting the JR-66-R, the pinout usually follows a circular pattern: * **Center Pin:** Common (Input). * **Outer Pins:** 1 through $N$ (Outputs). ```text (3) (2) (1) (4) (12) (5) [C] (11) <-- C = Common Pin (6) (10) (7) (8) (9) ```