The **18KPR-22-R** is a specific type of **Rotary Potentiometer**, commonly used in consumer electronics, audio equipment, and industrial control panels. It is designed to act as a variable resistor to control parameters like volume, frequency, or light intensity. --- ### Technical Specifications Based on the standard nomenclature for this series, here are the general technical characteristics: | Feature | Specification (Typical) | | :--- | :--- | | **Type** | Rotary Potentiometer | | **Resistance Range** | Commonly 1KΩ to 1MΩ | | **Resistance Taper** | Linear (B) or Logarithmic (A) | | **Shaft Diameter** | 6mm (Standard) | | **Power Rating** | 0.05W to 0.1W | | **Rotation Angle** | 300° ± 5° | | **Mounting Type** | Through-hole (PCB Mount) | --- ### Key Components and Construction 1. **Resistive Element**: Usually a carbon film track inside the housing. The "18" in the part number often refers to the outer diameter (18mm) of the potentiometer body. 2. **The Wiper**: A metal contact that slides along the resistive element as the shaft is turned, changing the resistance value. 3. **Shaft (K-Type)**: The "K" often denotes a **knurled** (splined) shaft, which allows for a plastic knob to be pushed onto it without needing a set screw. 4. **Terminals (R-Type)**: The "R" usually indicates a specific pin orientation, often referring to **Right Angle** pins for mounting horizontally on a Printed Circuit Board (PCB). --- ### Applications * **Audio Equipment**: Volume controls for speakers, amplifiers, and mixers. * **Home Appliances**: Temperature or timer settings on ovens or microwaves. * **Industrial Controls**: Speed controllers for small DC motors or brightness dimmers. --- ### Terminal Configuration (Standard 3-Pin) | Pin Number | Function | Description | | :--- | :--- | :--- | | 1 | Ground / CCW | Connected to the start of the resistive track. | | 2 | Wiper (Output) | The moving contact that provides the variable voltage. | | 3 | Input / CW | Connected to the end of the resistive track. |