Ian Fritz Jerkster - Chaotic CV Generator

Timo Rozendal's 6HP version of Ian Fritz's Jerkster

The Jerkster is a chaotic cv generator with 4 parameters: Rate, Gain, Drive, and Damping.
These parameters interact with the underlying chaotic circuit which can be decribed by a third order differential equation. Small changes in parameters can often lead to dramatic changes in the output. The 3 cv's are derivatives of eachother and can be periodic but also make unpredictable moves based on the settings. It can be used as random source, lfo and ‘screaming noise’-generator.

It also has a with a modulation input. If the modulation signal is a vco it can sound like a waveshaper. If you send envelope cv’s in the modulation input you can (after some tweaking) create chaotic signals which relate to the incoming rhythmic pattern.

The Z output is the ‘sharpest’ , the X output is the ‘smoothest’. For periodic settings the 3 different outputs are very similar (apart from the timbre and phase).

The module is based on this circuit with the following modifications:

There is a bicolor led indicator for each output which gives an indication what is going on in the system.

There are only single turn potentiometers used to keep the design simple, this limits the finetuning control a bit.

An option is added to let the modulation attenuator inject a DC voltage when nothing is plugged in in the output

https://modularaddict.com/ian-fritz-jerkster-chaotic-cv-generator-pcb-panel-timo-rozendal