Yusynth ARP VCF 2N3906 Module

The ARP4072 filter equipped mostly the famous ARP2600 semi-modular synthesizer.
Yves Usson designed his own version of this filter. He included in the design an input buffer stage and an ouptut buffer stage.
The output buffer stage is also used to compensate the loss of low frequencies that is generally observed at high resonance in 24db/octave filters such as the famous Moog ladder.
Curiously enough, neither Bob Moog nor Alan Richard Pearlman cared to compensate for this loss. This is strange knowing that it is quite a simple modification. Such compensation was introduced by Roland for the  filter of their nowadays very sought after TB303 !

On the two boards Yves built of this filter, he obtained pure sinewave auto-oscillation at high resonance within the range 20Hz-20kHz, for the first board, and within the range 60Hz-20kHz for the second board.

We all have our preferences when it comes to building our modular synth so we offer a range of products* for the build:

  • PCB
  • Individual components
  • Kit of parts (excluding PCB, knobs and connectors)
  • Knobs (Cliff KM20B)
  • Jack sockets
  • Power connectors
  • Front Panel
  • Back Panel
  • PCB Holder
  • PCB Holder Brackets
  • Panel PCBs
  • Wiring Leads

*Not all products are available at the time of writing but are in development

For the latest build information, we recommend visiting the YuSynth website at http://www.yusynth.net/Modular/index_en.html

However, we also include this build information in our product pages plus additional details relating to the complete module assembly using our front panel solution as they are developed.