West Coast Random Source

Sputnik Modular

A collection of random sources and utilities inspired by the Buchla 266 Source of Uncertainty that provides several different flavors of random modulation.

West Coast Random Source Features:

Fluctuating Random Voltages
Two sections for creating fluctuating voltage shapes that organically meander upwards. CV input and control over a bandwidth of .05hz to 50khz.

Quantized Random Voltages
Pulse input for generating 1v/oct semi-tone quantized random voltage CV input and knob for controlling range and distribution of random voltages. There are two different algorithmic outputs-“N+1 states” and “2N states“. N is an integer number in the range 1-6 that can be adjusted with the manual control (Man N) and an external control voltage CVN with attenuator. Whenever the rising edge of the input clock signal (Clk In) appears a new random voltage is generated at the N+1 resp. 2N output. The N+1 output is capable to generate N+1 different voltage levels (or states), the 2N output up to 2N different states. If for example N is set to 4 the N+1 output generates up to 5, the 2N output 16 different states. So essentially N+1 outputs a smaller selection of random steps but they are tuned to multiples of 1V (or octave), where 2N outputs a larger selection of random steps and they are tuned to 1/12v, (or a semi-tone), and both have their range and distribution adjusted by the N control.

Stored Random Voltages Pulse input generates stepped random voltage. The 1st output covers the full 0-5V range, where the 2nd output is voltage controlled and alters the distribution of voltages, to skew mostly high or low etc.

Noise Source
Three dedicated outputs for pink, white and blue noise, which are excellent as a sound source but are particularly useful for feeding the internal sample and hold.

Sample & Hold
When triggered, the sample and hold will read the input and freeze the current value until the next trigger. When fed with white noise, this provides a classic-styled random source. This sample and hold circuit is special because it is actually 3 sample and holds fed by the same source, where one sample and hold reacts to every trigger, where the other two react to alternating triggers, so it is able to provide 3 related but different outputs from the same source.

An included voltage controlled slew that is perfect for creating portomento effects or smoothing out the West Coast Random Source's various stepped outputs.


70 mA +12V
70 mA -12V
30 mA 5V
28 mm deep