Jitter in vcos- Arp Odyssey related

[Don Tillman]

   Date: Sat, 19 Jul 1997 13:30:45 -0400 (EDT)
   From: Synthfool at aol.com

   In the later Arp Odyssey models, the noise source uses a zener diode for a
   smoother quality of noise. The original designs used a "noise" transistor .

The noise transistor is a reverse-biased base-emitter junction, which
has a zener characteristic.  So they're really the same thing.  One
might happen to have superior noise characteristics of course, as the
parameters are slightly different.

   What is interesting is that the transistor style noise source caused
   miniscule bumps and spikes on the power supply lines. The zeners don't and
   thus the vcos behave in a more stable manner. After modifying an older style
   unit, the pitch stability was noticeably improved.

Huh?  I don't understand how the transistor noise source is going to
put bumps and spikes on the power supply lines.

  -- Don