This project is a compact, fully external volume control solution designed for classic or high-quality amplifiers that lack remote functionality. It avoids any modification to the amplifier itself, preserving its original circuitry and value.

Key Features

• Universal Compatibility
  Designed to work with virtually any amplifier that uses a rotary volume knob.
• Non-Invasive Installation
  No need to open or modify the amplifier. The module mounts externally and drives the volume knob mechanically.
• GT2 Belt Drive System
  Uses a GT2 timing belt (cut to length) secured with an integrated clamp for precise and reliable motion transfer.
• Stepper Motor Control
  Powered by a widely available 28BYJ-48 stepper motor with ULN2003 driver board, ensuring smooth and controlled rotation.
• Infrared Remote Control (IR)
  Controlled via a VS1838 IR receiver, compatible with virtually any IR remote (TV, DVD, etc.).
• Custom Remote Mapping
  Includes MicroPython code for:
  • Initial IR signal scanning
  • Button mapping to your chosen remote
• Visual Feedback
  Integrated WS2815 smart RGB LED provides clear status and function indication.
• Compact Integrated Design
  All components have dedicated mounting positions inside the enclosure, including a precise slot for the Seeed Studio XIAO ESP32C3 controller.
• USB Powered
  Runs on standard 5V via USB, compatible with any phone charger.
• Magnetic Mounting System
  Two  channels allow insertion of neodymium magnets (14mm x 3mm) for secure attachment to the amplifier chassis.

Technical Details

• Controller: Seeed Studio XIAO ESP32C3
• Firmware: Custom MicroPython
• Motor: 28BYJ-48 Stepper Motor
• Driver: ULN2003
• IR Receiver: VS1838
• LED Indicator: WS2815 (addressable RGB)
• Power Supply: 5V via USB

3D Printing

• Optimized for 0.6 mm nozzle
• Designed to print without supports
• Clean internal layout for easy assembly

What’s Included

• Fully functional 3D model (enclosure + mechanical parts)
• Custom MicroPython firmware
• Setup and installation instructions
• IR remote learning / configuration script

Notes

• The GT2 belt must be cut to the required length depending on your amplifier knob size and placement.
• Compatible with a wide range of amplifier front panel designs.
• Designed with DIY assembly in mind – no specialized tools required.