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Befaco VC ADSR – DIY Kit

Befaco VC ADSR – DIY Kit

Regular price €103,00
Sale price Regular price

Product details

Main features

  • Voltage controlCV input and slider for each of the Attack, Decay, Sustain and Release stages
  • Stage gatesindividual gate output for each stage, high while that stage is active
  • Curve controladjusts the envelope shape from linear to logarithmic/exponential
  • TriggeringGate/Trigger input plus a push button that can be held to sustain

Overview

The Befaco VC ADSR DIY Kit is a self-build version of Befaco's 8HP Eurorack envelope generator. Befaco calls it its take on the classic ADSR, made smaller, more capable and easier to use. It suits builders who want an envelope with voltage control over every stage and a gate output for each one. The kit contains all parts needed to complete the module, plus a power cable and four Befaco Knurlies M3 rack screws.

  • Voltage control per stage: Attack, Decay, Sustain and Release each have a slider and a dedicated CV input.
  • Per-stage gate outputs: each stage has its own gate output that goes high while that stage is active.
  • Variable curve: a potentiometer shapes the segments from linear to logarithmic/exponential.
  • Gate and trigger operation: in gate mode, release begins when the gate ends. In trigger mode, a single trigger produces an attack-release envelope.
  • Manual triggering: a push button fires the envelope, and holding it sustains the envelope.
  • Wide time range: attack, decay and release reach up to 10 s. Negative CV pushes attack down to 200 µs and decay down to 400 µs.

The core of the circuit is a dual-transistor current mirror working as a voltage-controlled integrator, combined with switching logic. Because each stage time is under CV control, the envelope can be shaped from other modulation sources as it plays, for example by shortening the attack with velocity or stretching the release from an LFO.

The four stage gates add sequencing and logic options. You can use the end of the attack to fire another envelope, or use the sustain gate to open a VCA or trigger an event elsewhere in the patch. LEDs show any incoming gate or trigger, including the push button, and indicate which stage is currently active.

The front panel is heat-treated aluminium. The module is designed in Barcelona, where Befaco also prepares the kits.

Specifications· 21 details

Format

Width
8HP
Depth (incl. power connector)
30mm
Weight
138g
Reference
DIY013

Inputs & outputs

CV inputs
4 (one per stage)
Gate/Trigger input
1
Envelope output
1
Stage gate outputs
4 (A, D, S, R)

Controls

Sliders
Attack, Decay, Sustain, Release
Curve
Potentiometer, linear to logarithmic/exponential
Manual trigger
Push button (hold to sustain)
Indicators
Gate/trigger LED, stage LEDs (A, D, S, R)

Envelope times

Attack
3.0ms min (200µS with negative CV), 10s max
Decay
2.8ms min (400µS with negative CV), 10s max
Release
2.8ms min (Sustain at maximum), 10s max

Power

Power draw +12V
55mA

General

DIY
Yes
Functions
Modulation
Height
3U
Synthesizer form factor
Control voltage or gate connectivity
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About the brand

Befaco

Barcelona-based maker of open-source Eurorack modules, sold assembled or as DIY kits. Known for experimental voices such as Oneiroi, hands-on build workshops and designs released under a Creative Commons licence.
Origin
ES
Founded
2010
Products
127
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