Eurorack SERGE Active Processor (ACPR) Full DIY Kit

£199.90 (Excl. VAT)

Officially licensed SERGE Active Processor in Eurorack!

Full DIY Kit with build documentation.



The ACTIVE PRO / NOISE / CV-PRO combines three extremely useful Serge modules, two of which are of the new 5th generation:

The Active Processor (ACPR) is an accurate, linear crossfader for either control voltages or audio signals. The new version designed by Serge in 2017 offers a widely increased precision. This module provides an important link in complex patches, allowing to smoothly change from one control voltage to another. It is possible to cross- fade between different envelopes, for example, or to gradually switch control over a bank of oscillators from one output of a sequencer to another output. The ACPR also offers interesting uses in the audio range, from wave- blending even to waveshaping (with CV in audio-range).

The Serge NOISE SOURCE (NOI) generates both white and pink noise waveforms. The S/H Source output pro- duces the necessary input for a sample and hold function to produce equi-probable random voltages, similar to a 1/F distribution function and is a perfect companion for the Smoothed & Stepped Generator (SSG).

The Precision CV-Processor (CV-PRO) is also a new development that goes beyond adding and inverting control voltages. A precision input stage allows mixing 1V/ Oct voltages, e.g. to cent-accurately transpose sequences (i.e. stay in tune). A switch transposes precisely one octave up or down. The attenuverting stage offers full processing control of level and polarity of three inputs voltages including Serge’s unique diode-based wave-compression. This new version now allows using the non-linear attenuverter mixing stage with precise 1V/Oct (AUX) inputs without losing their precision. IN 1 is normalled to 5V and therefore can be used to add an DC offset when no input signal is present.

This new version has been developed by Serge for and in close cooperation with Random*Source.

Some details of the Random*Source Serge ACPR kit:
  • Active Processor, newly designed by Serge in 2017
  • Serge Noise Source
  • New precision CV-Processor
  • Eurorack (3U) format, 18 hp
  • pcb in SMT, manufactured in Germany
  • No wiring needed
  • Power consumption:<=45mA @ +12V and <=40mA @ -12V
  • Module depth: < 35mm
 The Random*Source TWS+ euro kit contains:
  • Color printed front panel, 2mm, cnc made in germany
  • 1 Serge ACPR euro pcb (SMT, all SMT components mounted)
  • All parts required for the build down to rack screws and power cable

Build Document – Assembly Guide

Additional information

HP Size

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