Beyond The Rungler - An experimental Eurorack module based on the heart of the Benjolin

Published on Dec 28, 2014 elohess2

"For more description look here: http://journeytounknownsoundscapes.bl..."

"During my search to find a cool generative (and simple) pattern generator I found the schematic of the Benjolin and here. I will not build a full Benjolin. But what is the heart of the Benjolin? After looking some videos and studies of the schematics, I would say:

The Rungler

It's a sort of CV pattern generator. It works a little bit like a 1 bit random sampler (With a Sample&Hold feature). Samples are taken from an audio source, e.g. the audio output of the voices of the Benjolin or from a noise source (this is what I will describe here) is "sampled" and synchronized by a clock source (or an other trigger).

A serial stream of bits is shifted into a shift register one step per clock cycle.

This serial bit stream is used to feed a parallel digital analog converter in 3 bit resolution. At the end of the circuit a control voltage comes out and can be feeded into synth voices. And there is a feedback loop to replay the samples. The incomming audio confuses the feedback and so new patterns are generated.

Simple."