[sdiy] Buchla 266 fluctuating voltages

[Scott Stites]

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