Plum Audio – ARBA – Full DIY Kit

£76.00 (Excl. VAT)

Quad linear VCA / Clipper / Distortion / Limiter

SKU: Var_Plum_ARBA Categories: , , , Brand: HP Size: 4 HP


ARBA provides four Voltage Controlled Amplifiers (VCA) with linear response. ARBA may look like a simple VCA module but under the hood it is packed with features that unleash a variety of uses.

Three features that distinguish ARBA:

-Normalization: Everything is normalized to everything – all of the inputs, CV inputs and outputs are normalized between the four channels so you can use a variety of configurations depending on how you patch it. As a result of this feature, you can get a significant gain boost (with CV control!) when you chain several channels together.

-Variable sensitivity: Unlike most VCA’s in Eurorack that clip easily due to the 5V unity gain – the cause of this annoying clipping is that many envelope generators output a standard voltage of 8V – with ARBA you can set the sensitivity of each of the channels (or – how much voltage needs to reach the CV input to get unity gain at the output) using the four trimmer resistors located on the back of the module.

-Limiters: soft clipping diodes will limit the outputs to 10.2 volts peak-to-peak and warm up the sound (the limiters can be disabled using switches on the back of the module).

The combination of these three features allows a variety of uses, for example:

  • Quad simple linear VCAs Stereo VCAs
  • Summing VCAs
  • Soft clipper
  • Distortion with CV control
  • Level booster (instrument or line level to Eurorack level) And much more…


  • Width: 4HP
  • Depth: 20mm
  • Power Consumption: +12v – 50mA, -12v – 50mA

ARBA – Build DocumentUser Manual

Additional information

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