The part number **102-E-R** typically refers to a specific type of **Rotary Switch** or a precision **Potentiometer** component, often associated with manufacturers like *Alps Alpine* or *Alpha*. Below is a breakdown of what these parts generally represent in the electronics industry. ### 1. General Component Breakdown When decoding industrial part numbers like "102-E-R," the segments usually represent the following technical specifications: | Segment | Meaning | Technical Detail | | :--- | :--- | :--- | | **102** | Resistance / Value | In resistor notation: 10 followed by 2 zeros = **1,000 Ohms (1kΩ)**. | | **E** | Taper / Characteristic | Often refers to a **Linear** or specific logarithmic curve. | | **R** | Orientation / Feature | Usually stands for **Right Angle** mounting or **RoHS** compliant. | --- ### 2. Common Application: Rotary Potentiometers In many catalogs, this part belongs to the category of small-form-factor variable resistors used for volume control or tuning. #### Technical Specifications * **Resistance Value:** 1k Ohm. * **Tolerance:** Typically ±20%. * **Power Rating:** Usually 0.05W to 0.1W (signal level, not power level). * **Rotation Angle:** 300° ±5°. * **Mounting Type:** Through-hole (PCB) with a "Right Angle" orientation, meaning the adjustment knob sits perpendicular to the board. --- ### 3. Usage and Applications These components are found in consumer electronics where manual adjustment is required: 1. **Audio Equipment:** Volume or gain control in portable radios or guitar pedals. 2. **Industrial Controls:** Setting threshold values on sensor controllers. 3. **User Interfaces:** Brightness adjustment for small LCD screens. 4. **DIY Electronics:** Commonly used with Arduino or Raspberry Pi breadboard projects for analog input. --- ### 4. Visual/Mechanical Features * **Shaft Type:** Often a "D-shaft" or "Knurled shaft" made of plastic or metal. * **Terminals:** 3 pins (Input, Output/Wiper, Ground). * **Size:** Generally 9mm or 12mm casing width. ---