The **47LAC-201B-R** is a specific type of **Rotary Potentiometer**, often used in precision electronic circuits for manual adjustment of resistance. It belongs to a category of components designed for panel mounting and industrial control. --- ### 1. Key Technical Specifications Based on the part number nomenclature (common for series like the 47L), here are the typical technical characteristics: | Feature | Specification | | :--- | :--- | | **Component Type** | Rotary Potentiometer | | **Resistance Value** | 200 $\Omega$ (indicated by the "201" code) | | **Tolerance** | $\pm$10% to $\pm$20% (Standard) | | **Power Rating** | Typically 0.5W to 2W (depending on series) | | **Number of Turns** | Single-turn (Standard) | | **Mounting Type** | Panel Mount with solder lugs/terminals | | **RoHS Compliance** | Yes (indicated by the "-R" suffix) | --- ### 2. Breakdown of the Part Number The part number can be decoded as follows: * **47L**: Represents the series (usually a precision or industrial wirewound/cermet series). * **AC**: Refers to the physical configuration (bushing style or shaft type). * **201**: The resistance code. The first two digits (20) are the significant figures, and the third (1) is the multiplier. $20 \times 10^1 = 200 \Omega$. * **B**: Refers to the **Taper**. "B" typically stands for **Linear Taper**, meaning the resistance changes proportionally to the rotation of the shaft. * **-R**: Indicates compliance with **RoHS** (Restriction of Hazardous Substances) standards. --- ### 3. Internal Construction These parts are generally constructed using one of two materials: 1. **Wirewound**: A resistive wire is wrapped around an insulating core. These are high-precision and can handle higher power. 2. **Cermet**: A ceramic-metal composite. These offer better stability over time and higher resolution. ### 4. Common Applications * **Industrial Controls**: Adjusting motor speeds or sensor sensitivity. * **Audio Equipment**: Used in older or high-fidelity gear for volume or gain control. * **Test Equipment**: Calibration knobs on multimeters or oscilloscopes. * **Power Supplies**: Fine-tuning voltage or current output limits. --- ### 5. Terminal Wiring Diagram A standard 3-terminal potentiometer like this is wired as a voltage divider: ```text Pin 1: Input (High) Pin 2: Wiper (Adjustable Output) Pin 3: Ground (Low) ```