Cellular Automata

Description

In "like-new" condition; all input/outputs are in good shape and make solid connections.It was built an expert builder and has minimal rack-rash (can't really see it once mounted).I bought this for testing but did not work out for my project, only used very briefly. Comes from a smoke-free environment with no pets. Comes with power cable.Please feel free to ask any questions. I will ship safely and insured via Reverb; Thanks for looking!#### description the original builder:Per Andrew, “This is a 16 cell gate and pattern generator using cellular automata rules 90 & 150. It will run thru a process driven by a clock signal and requires a signal on one of the seed inputs (anything crossing 1V) to start a new process or alter the current one. The seed inputs feed external signals into the 4 corner cells. A process without seeds may run for hours or minutes, depending upon the start point and clock rate.”EDIT: As a wise buyer just pointed out, this module has a CMOS timing issue, described by Andrew in the build docs: "The others are a mod suggested by builder Andy B. who found the CA puts out spurious triggers on every clock pulse. These triggers are very short and sharp, which do not affect other NLC modules but don’t play nicely with Befaco modules. So, installing them is optional but probably a good idea if you have Befaco in your system."This version of the module doesn't have the pads for those 16 slew-limiting caps, so it does display the problem described -- very short/sharp (~30 milliseconds, 3-4 volts) spikes. I have included a photo of what it looks like on an oscilloscope. Note that if a given output is being held "high" for multiple clock pulses, the spurious triggers are negative-going & thus probably won't trigger a drum module or an EG, which means that while they're there on every clock pulse, you'll probably only notice them when that output is otherwise being held "low."The spikes are enough to trigger my twin-T drum module despite it having some trigger conditioning on the input -- that module behaves differently depending on the trigger size, so the hits sound like little accent taps, which is probably why I didn't notice this before :) -- and I guess depending on your use-case, it's a feature or a bug.I have been building Eurorack modules for six years, and have built more than 200, both other people's and my own designs. This is a clean, expertly built module.

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