Rampage DIY Kit

The Rampage is Befaco’s approach to an old invention: the Serge/Buchla ramp generator.

This is for a full kit in the Eurorack format. A few SMD components come pre-soldered.

Availability: In stock




We took the idea of a “patch programmable” function generator/processor, put two units in the same module and tried to expand them with new funky functions and ways to combine them: Slope detectors, analogue logic functions and a few extra outputs to add some more complex features.

The module is built around two voltage controlled integrators. Integrators (also known as Lag Processors or Slew limiters) allow you to process your voltages, converting sharp square waves in ramp-like waveforms.

These lovely devices can, for instance, convert a gate signal into a simple envelope, or achieve a “portamento” or “glide” effect when applied to pitch CV. Other well known application of an integrator is it’s ability to low-pass filter an audio signal.

Some Rampage applications:

  • Voltage controlled Attack Decay envelope.
  • Attack Sustain Release Envelope .
  • More complex ADSR Style Envelope.
  • Dual VCO. With Square, PWM, Saw, Log, Exp and Triangle shapes. Hard and soft sync.
  • Gated VCO
  • VCO + Analog AND Gate (As ADTimbral VCA)
  • Dual Low Pass Filter
  • Dual Low pass Filter with VCO soft sync.
  • Low Pass Filter + AD Envelope
  • Dual “syncable” voltage controlled LFO with Square, PWM, Saw and Triangle shapes)
  • Complex LFO . Function combination.
  • CV controlled and “Ping-Pong” LFO.
  • Dual Slope detector. Distinguishes when and incoming signal (CV or audio) is rising or falling, and generates gates in concordance.
  • Comparator. Send a gate when B IN is bigger than A IN
  • Polyrythmic gate generator. With both channels synced between each other, it generates several “complex rhythm” gates.
  • Voltage controlled Slew limiter with independent attack and decay control and continuous variable shape between Log, linear and expo.
  • Peak Voltage follower. Max Out follow the maximum Level of the two inputs.
  • Minimum Voltage Follower. Min Out follow the minimum level of the two inputs
  • Envelope follower with adjustable response for rising ans falling flanks.
  • Voltage controlled Trigger Delay .
  • Burst Generator.

Specs & Downloads

Specs & Downloads

manufacturer Befaco
HP 18
Depth No
+12V 110mA
-12V 90mA
+5V No
Additional Resources Build Guide


Customer Reviews (2)

Lots of fun!Review by James
This was by far the most complex DIY kit I've put together, but it it well organized and it's a joy to play. My only feedback is that when you are placing the ferrite beads and they say you need to leave room, make sure you do that! I had to redo these pieces in order to fit the power header. (And they warn you about this in the instructions. I'll pay attention next time.)

I've made three Befaco kits and they all work exactly as advertised. I can't wait to see what they come up with next. (Posted on 9/6/2016)
Very logical module and quality kit.Review by Ryan
This is a great module that you can quickly understand, it's very logical and laid out well. Like all of Befaco's kits the panel is high quality aluminum and the kit components are broken out into bags per board. The boards are easy to solder, good footprint spacing and the footprints numbered in order so it's easy to locate for the part your soldering. (Posted on 8/25/2016)

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