100K Ohm Linear Potentiometer PCB Mount Module - Single Turn B100K Rotary Variable Resistor, Through-Hole Pins for Arduino Electronics DIY Circuits and Audio Tuning Controls

The DIYKIT 100K Ohm Linear PCB-Mount Potentiometer is an essential hardware control component designed for electronics prototyping, circuit design, and DIY hobby projects. Engineered with standard through-hole terminal pins, this rotary potentiometer inserts easily into solderless breadboards, perfboards, and custom printed circuit boards (PCBs). Featuring a linear taper (B100K), it provides a direct, predictable, and proportional relationship between physical shaft rotation and output resistance or voltage level. Whether you require a tactile interface knob for microcontrollers or a continuous manual adjustment for analog audio, power supplies, and lighting circuits, this potentiometer delivers smooth operation and consistent electrical performance.

A potentiometer operates as a three-terminal variable resistor. In this 100K Ohm model, the outer two terminals connect to a fixed carbon track or resistive element rated at 100,000 Ohms. The center terminal is attached to a sliding wiper that moves along the resistive track as the shaft turns. When wired across a voltage source (such as 5V or 3.3V) and ground, the wiper provides a continuously variable voltage output from 0% to 100% of the input voltage, making it an optimal voltage divider for Analog-to-Digital Converter (ADC) inputs on development boards. Alternatively, by connecting the wiper terminal to one of the outer pins, the component functions as a two-terminal variable resistor (rheostat) to adjust current flow or tune timing RC constants. The linear resistance characteristic ensures that equal rotational increments produce equal resistive changes, which simplifies mathematical scaling in microcontroller software and analog feedback loops.

• Nominal Resistance: 100K Ohm (100,000 Ohms)
• Resistance Taper: Linear (B-Type)
• Total Resistance Tolerance: ±20% (varies by revision)
• Mounting Type: PCB Through-Hole
• Pin Spacing / Pitch: Standard breadboard compatible (2.54mm / 0.1 inch spacing)
• Rotation Angle: 300 degrees total rotational sweep (approximate, check datasheet)
• Power Rating: 0.1W to 0.125W (typical for small signal rotary pots)
• Maximum Operating Voltage: 50V AC / 20V DC (safe low-voltage operation)
• Operating Temperature Range:
• 10°C to +70°C
• Rotational Life: Up to 10,000 cycles

• Microcontroller Input: Serves as a manual control knob connected to analog pins on Arduino, Raspberry Pi, ESP32, and STM32 boards for adjusting parameters like motor speed, delays, or setpoints.
• Audio Signal Attenuation: Controls volume levels, balance, and gain stages in custom audio amplifiers, preamps, and synthesizer modules.
• Lighting & Display Controls: Regulates LED brightness via PWM reference signals or direct current trimming in analog display drivers.
• Threshold & Sensitivity Calibration: Sets trigger levels for comparator circuits, op-amp gain configurations, and environmental sensor modules.
• Timing Adjustments: Tunes pulse frequencies and duty cycles in 555 timer oscillator circuits and pulse generators.

When connecting to an Arduino or other ADC pin, wire terminal 1 to GND, terminal 3 to VCC (5V or 3.3V), and terminal 2 (wiper) directly to the analog pin. To reduce electrical noise and voltage ripple caused by mechanical wiper contact, place a 0.1uF ceramic decoupling capacitor between the wiper pin and ground close to the microcontroller input. When soldering into PCBs or perfboards, maintain standard soldering iron temperatures (around 300°C to 350°C) and limit heat exposure to under 3 seconds per pin to avoid damaging the internal plastic housing or carbon element. Ensure physical strain relief if applying external control knobs to prevent flexing the terminal pins.

1 x 100K Ohm Linear PCB-Mount Potentiometer