The Benjolin is a relatively simple but wonderfully clever analog, complex sound generator designed by synth pioneer Rob Hordijk.
<img src="http://web.me.com/klangbureau/DIY/Benjolin_files/WS-kits-2.jpg" alt=""  width="400" height="300" />
Here's what Rob has to say about the Benjolin on his <a href="http://web.me.com/klangbureau/DIY/Benjolin.html">website</a>.
<em>"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." </em>
Rob has posted a bunch of Benjolin info <a href="http://electro-music.com/forum/topic-38081.html">HERE</a> including schematics and a thorough description of how it all works.
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Here's all the info that Rob has put online about building your own Benjolin:
*<a href="http://electro-music.com/forum/forum-185.html">Benjolin forum</a>*
*<a href="http://electro-music.com/forum/topic-40834.html">Instructions</a>*
*<a href="http://electro-music.com/forum/phpbb-files/benjolinschematic_164.pdf">Schematic</a>*
*<a href="http://electro-music.com/forum/phpbb-files/benjolinpcbv2_732.pdf">PCB</a>*
*<a href="http://electro-music.com/forum/phpbb-files/benjolinv2layout_494.pdf">PCB parts layout</a>*
*<a href="http://electro-music.com/forum/phpbb-files/benjolinbillofmaterials_168.pdf">Parts list</a>*