[sdiy] Buchla 266 Quantized Random Voltage

[Joshua Shroyer]

Did you see the 200 user guide submitted in the general topic section of that forum? I found it very useful. 

> On Dec 13, 2013, at 11:17 PM, Pete Hartman <pete.hartman at gmail.com> wrote:
> 
> I'm troubleshooting one of Roman's 266 clones, and while I understand
> what the QRV is supposed to DO, I don't yet grasp entirely HOW it is
> supposed to do it.
> 
> The behavior I see is that on the start of my clock, I get quantized
> voltages, correctly varying among a number of steps based on the input
> pot, for 20 clocks.  After that I get nothing, for as long as I've
> been able to observe.
> 
> I understand that we're looking at a shift register.  I've read Dave
> Brown's discussion of the startup voltage to start things off with all
> 1's....what I suspect is happening is that after those ones are
> shifted out, I'm only getting zeros in.  But I'm not grasping (at
> midnight anyway ;-) ) how I might test that hypothesis, nor how it is
> that it should be getting things that aren't zeroes shifted back in.
> 
> I've googled a couple of things trying to find something discussing it
> in step by step detail, but found nothing.  I scanned Bernie's
> Electronotes article about random voltages from issue #64, but nothing
> jumped out at me as matching the topology (though I do see he talks
> about shift registers, so when I'm more awake I will try to read it
> more closely).
> 
> But if anyone knows of a resource where this is discussed in more
> detail, I would very much like to read it.
> 
> Thanks!
> 
> Pete
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