The 500k Volume Control Potentiometer (available in Logarithmic/Audio A500K taper for natural volume control and Linear B500K taper for tone/level control) is an industry-standard rotary potentiometer designed for audio frequency attenuation, volume regulation, and signal mixing. Featuring a smooth resistive carbon track, low rotational noise, and a standard knurled/split shaft for universal knob mounting, this 500kΩ control is widely used in electric guitars (especially humbucker pickup circuits), high-fidelity audio preamplifiers, tube amplifiers, mixing consoles, and DIY audio projects.

Specifications

• Product Type: Rotary Carbon Film Potentiometer / Volume Control
• Nominal Resistance: 500kΩ (500,000 Ohms)
• Resistance Tolerance: ±20% (Standard) / ±10% (High Precision)
• Resistance Taper: Audio / Logarithmic (Type A – standard for volume control) or Linear (Type B)
• Rated Power Dissipation: 0.125W to 0.2W (at 50°C)
• Maximum Operating Voltage: 200V to 250V AC/DC
• Insulation Resistance: ≥ 100MΩ at 250V DC
• Dielectric Withstanding Voltage: 500V AC for 1 minute
• Rotational Angle: 300° ± 5° (Total Electrical & Mechanical Travel)
• Rotational Torque: 20 to 200 gf·cm (Smooth, stable action)
• Rotational Life: ≥ 10,000 to 15,000 cycles
• Shaft Type: 6mm Split / Knurled (18-tooth) or Solid Round Shaft (Brass / Aluminum)
• Bush / Mounting Thread: M7 / M8 / 3/8" Threaded Bushing with supplied washer and mounting nut
• Termination: Standard 3-Lug Solder Terminals / PCB Solder Pins
• Operating Temperature: -10°C to +70°C

Features

• Audio Taper (A-Type) Curve: Matches the logarithmic hearing response of the human ear, providing a smooth and perceptually linear increase in volume across the rotation.
• Optimized for High-Impedance & Humbucker Circuits: The 500kΩ resistance prevents high-frequency treble bleeding to ground, preserving the bright harmonics and punch of humbucker pickups and tube amp inputs.
• Low Dynamic Noise: Premium carbon composition element ensures crackle-free, low-distortion audio attenuation during rotation.
• Sturdy Metal Bushing & Shaft: Heavy-duty threaded brass/alloy bushing allows secure panel mounting onto instrument faceplates, chassis enclosures, and guitar pickguards.
• Includes Mounting Hardware: Comes complete with a metal washer, internal star lock washer, and hex nut for firm panel installation without loosening under continuous rotation.

Common Applications

• Electric Guitars & Basses: Standard master volume and tone control for guitars equipped with humbucker pickups (e.g., Gibson, Epiphone, Ibanez, PRS styles).
• Audio Preamplifiers & Power Amps: Master input level and attenuator control in stereo audio systems and tube guitar amplifiers.
• Active/Passive Studio Monitors: Analog volume trim controls and monitoring level selectors.
• DIY Audio Mixers & Synthesizers: Channel level fading, master output volume, and variable parameter tweaking.
• Headphone Amplifiers & DACs: Analog volume regulation stage for dedicated headphone drivers.

Usage Tips

• Standard 3-Lug Volume Wiring: Looking at the potentiometer with the shaft facing you and lugs pointing down:
  • Lug 1 (Left): Audio Input Signal (from preamp/pickup/source).
  • Lug 2 (Center / Wiper): Audio Output (to amplifier power stage or output jack).
  • Lug 3 (Right): Circuit Ground / 0V Reference.
• Treble Bleed Circuit (Optional for Guitars): Adding a small capacitor (e.g., 1nF / 0.001µF) in parallel with a 150kΩ resistor across Lug 1 and Lug 2 prevents high-frequency loss when turning down the volume.
• Chassis Grounding: When soldering ground leads to the back casing of the potentiometer, lightly scuff the metal with sandpaper, apply flux, and use a hot soldering iron quickly (2–3 seconds) to avoid overheating the internal resistive carbon track.
• Taper Selection: Use Audio (A500K) for volume attenuation to ensure an even volume swell; use Linear (B500K) primarily for tone control, active EQ circuits, or sensor position sensing.

Datasheet