UPDATE APRIL 2016:
The Turing Machine has been updated to a new version which is easier to build and more powerful than the original design.
The Random Looping Sequencer is a circuit that produces clocked randomly changing control voltages. These can also be locked into loops that repeat every 8, 16 or 32 steps.
This is an open hardware project – all the project files (Eagle CAD projects, Gerbers PCB files, a Mouser BOM and Illustrator/PDF front panel designs) are available on this page, covered by a Creative Commons Attribution Share-a-like license, which allows for commercial use.
This is a relatively advanced DIY project, and I’m not able to provide support. I am not selling PCBs, kits or finished modules, but hopefully all the information you’d need to get your own is here: Getting the parts to build a random sequencer. Update: You may be able to buy full kits from thonk.co.uk
The obligatory video demo:
A few audio demos:
As a sequencer:
One random sequencer controlling a Dixie oscillator clocking a second random sequencer acting as a wavetable oscillator (phew!):
Documentation and build documents
(All CC licensed)
The latest version is v2.1, which fixes the capacitor polarity issue in v2. V2 schematics and documents are below.
– This PDF file contains the schematic, block diagram, how the circuit works and how to build the PCB.
– Large png image of the rather scruffy schematic. It’s all there. If you want to examine the schematic in detail, the Eagle version might be easier to navigate.
– These contain the files used to create two different styles of panel for the sequencer.
Background and research documents
– A collection of web-sourced background material about the history of random voltage sources and shift register sequencers, including: pages from Allen Strange and Hal Chamberlin’s books, interview transcript with Don Buchla, documentation for modules from Grant Richter and Dieter Doepfer and an essay on process music by Steve Reich.
– PDF datasheets of many of the ICs and other components used
– Important: Please read this addendum before building using the v2 instructions above.
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