“The Benjolin is a ‘noise box’ that is ‘bent by design’, meaning that it always has a definite amount of unpredictability while it is still intuitive to play. The Benjolin features two eighteen-octave range voltage controlled oscillators that drive a ‘rungler’ circuit, circuitry that in essence uses a special interference technique feeding back into the oscillators to force them into wild chaotic behaviour.
A special slightly chaotic filter is both excited and modulated by the signals from the rungler circuitry processes, producing sounds between fat drones to grungy noise havoc.” 
Rob Hordjik

I made Benjolin from scratch – hamd-etched PCB at Ljudmila‘s “Pif-lab” (geek-lab), solederd and wired at home. It is powered by 12V bipolar power supply.