[sdiy] Buchla 266 Quantized Random Voltage

[Martin Fay]

Hi Joshua,

What forum are you referring to?

Martin

Sent from my iPhone

On 14 Dec 2013, at 06:23, Joshua Shroyer <gaslampmusehog at yahoo.com>  
wrote:

> 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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