[sdiy] Buchla Dodecamodule docs?

[Dave Leith]

I wonder if the design is anything like the Buchla 160 White Noise
Generator or B4100-3 Reverb and Noise Source. There is a schematic for
those on Magnus's site and both use a transistor junction for the
noise source.

Perhaps more likely from the description below on Buchla's site
http://www.buchla.com/historical/b200
The functions sound a bit like what the Buchla 265 and 266 (Source of
Uncertainty) do. The 265 uses a selected zener for the noise source.
The 266 uses the infamous MM5837 digital noise chip. These schematics
are both on Magnus's site as well.

Model 212
Stored random voltage
A source of unpredictable control voltage that changes when a pulse is
applied. Probability distribution (over control voltage range) is
flat; correlation is zero.
Random voltage source
A source of continuously changing random voltage with a modified
Gaussian probability distribution and voltage-controlled spectral
bandwidth (probable rate of change).


On Wed, Nov 10, 2010 at 9:31 PM, Byron G. Jacquot <thescum at surfree.com> wrote:
> Howdy all,
>
> A friend has a Buchla electronic music box.  He brought it to me for a little TLC.  I've been able to suss out and solve a few issues, but I've got one remaining that's not been so forthcoming:  The Random Voltage Source quits working as the machine warms up.  It runs fine when it's cool, but stalls after a few minutes.
>
> I've seen Magnus' schematic collection, but there's no 212.  Does anyone have any documentation for this guy, or any idea where I should be looking?
>
> Thanks,
>
> Byron Jacquot
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