[sdiy] Buchla 266 fluctuating voltages

[Peter Grenader]

Thing is though...I would not have considered making this circuit if I did
not have the 5837 at it's core because,  repetitive as it is that's what
makes it what it is....and I like that.

It harkens back to the discussion a couple of years ago of finding quicker
vactrol and/or sub opto-electrical device for the low pass gate to improve
its response - even though the slow decay IS the sonic personality of that
circuit.  Ditto for the Wasp and all it's flaws.

Don did make a fluctuating random circuit without the 5837 however - its in
the 265.  A quick look at Magnus' site shows this:

http://www.takeonetech.de/buchi/magnus/synths/companies/buchla/Buchla_2650_2
00.jpg

I believe there's yet another variant on the CBS Educational cluster module.

Scott Stites wrote:

> Hi Jim,
> 
>> Another alternative, if you need to have pseudo random noise, is
>> to make your own from some HC164 shift registers and a quad xor gate.  32
>> bit long sequences sound pretty white....and the repeat rate is hours....
> 
> Thomas Henry has a circuit involving four 4015's at a clock rate of 200 kHz
> that'll go for over three hours before repeating!
> 
> Prolly due to the same tin-earitis, but I couldn't tell any difference
> between long shift register noise sources and the transistor/comparator
> thing I finally settled on.  The white sounds white, the flat (pink) sounds
> flat, and the -3 dB sounds, well darker than pink (it's my first encounter
> with -3 dB).  So, I went with the lower parts count.
> 
> I do like sweeping the clock on shift register noise sources,
> though....that's something you can't do with a trannie noise source =0).
> 
> Cheers,
> Scott
>