The B500K (500kΩ) WH148 Right-Angle Linear Single Rotary Potentiometer is a 3-pin PCB-mount variable resistor designed for horizontal board mounting and precision panel controls. Featuring a 15mm knurled/split shaft, right-angle bent through-hole pins, and a Linear (Type B) resistance taper, the WH148 delivers smooth mechanical travel, stable linear resistance variation, and low rotational noise. It is widely used in audio mixers, synthesizers, tone controls, test equipment, industrial controllers, and micro-controller sensor interfaces.

Specifications

• Model / Series: WH148 Single Unit (Right Angle / Horizontal Mount)
• Nominal Resistance: 500kΩ (500,000 Ohms)
• Resistance Taper: Type B (Linear)
• Resistance Tolerance: ±20% (Standard)
• Rated Power Dissipation: 0.125W (1/8W at 50°C)
• Maximum Operating Voltage: 200V AC / DC
• Insulation Resistance: ≥ 100MΩ at 250V DC
• Dielectric Withstanding Voltage: 500V AC for 1 minute
• Total Rotational Angle: 300° ± 5°
• Rotational Torque: 20 to 200 gf·cm
• Rotational Life: ≥ 15,000 cycles
• Shaft Length (L): 15mm (including threaded bushing)
• Shaft Type: 6mm Diameter Knurled / Split Shaft (18-tooth standard)
• Mounting Bushing Thread: M7 (Includes mounting nut and metal flat washer)
• Pin Configuration: 3-Pin Right-Angle Through-Hole (Pitch: 5.0mm / 2.54mm compatible layout)
• Operating Temperature: -10°C to +70°C

Features

• Linear Taper (Type B): Provides a direct 1:1 proportional relationship between shaft angle and resistance, ideal for precision parameter adjustments and sensor inputs.
• Right-Angle 90-Degree Pins: Mounts parallel to the PCB surface, allowing the shaft to project horizontally through front-panel enclosures without extra wiring.
• Standard 15mm Knurled Shaft: Universally compatible with push-on, set-screw, and collet-style 6mm control knobs.
• Included Panel Hardware: Supplied with a mounting nut and flat washer to securely anchor the potentiometer to the chassis or front panel.
• Compact & Durable: Rigid metal bracket and dust-resistant carbon element ensure reliable performance in modular electronics and audio hardware.

Common Applications

• Audio Tone & EQ Controls: Treble, mid, bass, and balance adjustments in graphic equalizers and audio mixers.
• Synthesizers & MIDI Controllers: Parameter modulation (cutoff frequency, resonance, LFO speed, attack/decay).
• Arduino & Microcontroller ADC Inputs: Voltage divider input for manual tuning, speed control, or menu navigation.
• Variable Timers & Oscillators: Resistor tuning element in 555 timer circuits, PWM controllers, and function generators.
• Power Supply Voltage / Current Trimming: Panel-mounted fine adjustments for benchtop DC power supplies.

Usage Tips

• Pinout Configuration: Looking at the potentiometer with the shaft pointing toward you and the bent pins pointing down:
  • Pin 1 (Left): Terminal 1 (typically tied to VCC / +5V or Signal Input).
  • Pin 2 (Center): Wiper (Output voltage or variable resistance to ADC / circuit).
  • Pin 3 (Right): Terminal 2 (typically tied to Ground / 0V).
• Soldering Temperature: Solder right-angle pins within 3 seconds at a maximum temperature of 350°C to prevent warping the internal carbon wafer.
• Linear vs. Audio Taper: Use this B500K (Linear) for tone, sensors, speed, and timing circuits; for natural audio volume attenuation, use an A500K (Audio/Logarithmic) potentiometer instead.

Datasheet