The **2123-R** typically refers to a specific series of **Rotary Potentiometers** or **Rotary Switches**, most commonly manufactured by brands like **Bourns** or **TE Connectivity**. These components are essential for human-machine interfaces where a variable resistance or mechanical selection is required. Below is a technical breakdown of the electronic specifications and characteristics of the 2123-R series. --- ## 1. Core Technical Specifications These parts are generally categorized as precision electronic components designed for PCB mounting. | Feature | Specification (General) | | :--- | :--- | | **Component Type** | Rotary Potentiometer / Variable Resistor | | **Mounting Type** | Through-hole (THT) or Surface Mount (SMD) | | **Resistance Range** | 1kΩ to 1MΩ (Commonly) | | **Tolerance** | ±10% or ±20% | | **Power Rating** | 0.05W to 0.25W | | **Rotation Angle** | 270° to 300° (Mechanical) | | **Operating Temp** | -10°C to +70°C | --- ## 2. Structural Components The "2123-R" designation usually implies a specific physical form factor. 1. **Resistive Element:** Usually made of **Carbon Film** or **Cermet**. This is the track that provides the resistance. 2. **Wiper:** The internal metal arm that slides across the resistive element to change the voltage output. 3. **Shaft (The "R" Suffix):** In many naming conventions, "R" indicates a **Ribbed** or **Knurled** shaft, designed to hold a plastic knob securely without slipping. 4. **Terminals:** Three pins—two for the outer ends of the resistor and one for the center wiper. --- ## 3. Common Applications The 2123-R series is found in consumer and industrial electronics where manual adjustment is necessary: * **Audio Equipment:** Volume and tone controls for amplifiers or mixers. * **Lighting Dimmer Switches:** Controlling the intensity of LEDs or small lamps. * **Industrial Controls:** Setting parameters on PLCs or motor speed controllers. * **Instrumentation:** Calibration knobs on multimeters or power supplies. --- ## 4. Identification Code Breakdown If you are looking at a specific part number like `PDB2123-R`, here is how to read it: ```text [Series Prefix] - [Mechanical Style] - [Shaft Type] | | | PDB21 (Size) 23 (Terminal) R (Ribbed Shaft) ``` ---