Befaco – I⁴ Instrument Interface – DIY Partial Kit

£46.50 (Excl. VAT)

A versatile instrument input module with Preamp, Envelope Generator, Trig extractor and more.

Note: This is a partial kit only. For the Full DIY Kit go HERE

Out of stock

You must register to use the waitlist feature. Please login or create an account
SKU: ParKit_Befaco_INSTRUMENT_INTERFACE Categories: , , , Brand: HP Size: 8 HP


This is the partial kit of the I⁴ Instrument Interface module. Includes PCB/Panel Set + Rare parts- see below for a full list of what’s included.

Sometimes the interaction between a modular system and other musical instruments (electronic or acoustic) is needed. With an envelope follower circuit we can achieve a direct control of the amplitude of the signal.
It will produce a control voltage proportional to the amplitude. Allowing a real communication between our system and the external sound source.

Instrument Interface is an eurorack pre-amp capable to bring any type of audio signal to modular levels thanks to its amplification circuit.
The module can drive regular and condenser microphones (+48V Phantom Powered) as well as Instrument and Line signals with a very low distortion ratio.
Going further from the regular re-amp operation, Instrument Interface offers some additional extra functions like a Trig/Gate extractor and Envelope Follower circuits, allowing you to use the character of your audio signal in more creative ways


  • Neutrik combo input
  • Phantom power selector
  • Input impedance selector
  • Separated audio & envelope level controls.
  • Envelope follower with attack and decay controls
  • Gate and trigger extractor with threshold selector

This Partial Kit contains:

  • 1x Instrument Interface PCB Set
  • 3x Potentiometer Single Gang 100k Linear PCB
  • 5x Jack 3.5mm Thonkykong Mono PCB
  • 1x Knob Davies Dark Grey T36 Shaft
  • 1x Knob Micro 7.5mm Light Grey T36 Shaft
  • 1x Knob 19mm Medium Red T36 Shaft
  • 2x Sliding Potentiometer 30mm 100k Linear PCB
  • 1x Sub Mini Toggle Switch ON-OFF-ON DPDT
  • 3x Black Bananut for Pot
  • 5x Red Bananuts
  • 1x Slide panel switch mini on-ón spdt
  • 2x Toggle Switch Cap Red

Instrument Interface – Build Guide & BOM | User Manual | iBOM


  • Width: 8 HP
  • Depth: 30 mm
  • Current needs: +12V: 26mA, -12V: 12mA
  • Aluminium, heat-treated front panel


Additional information

Weight 0.1 kg
HP Size