The Cyndustries List

From: http://www.buzzclick-music.com/model_15.html

"Various component improvements on the Model 15 core have increased for 1V/oct 
tracking to SEVEN OCTAVES - with none of the hick-ups associated with sawtooth core 
VCOs past the 3k limit. An important note: the Model 15 has a TRIANGLE core. Because of 
that, the high freq compensation circuitry associated in saw core VCOs is unnessesary as 
there is no fixed charge time - the positive slew of the Model 15's triangle core tracks the 
oscillating frequency.

Technically speaking, there are three sets of transistors in the Model 15's core that affect 
current. The accumulation of the resistor values which were previously spec'd in that core 
were keeping these transistors, most notably the current mirror and expo converter, on 
the bleeding edge of their linear region and within a 10th of a volt of the rail. The net 
effect was limiting the tracking range to about four octaves. A simple substitution of 
resistor values in the core has shifted the current variances well within the heart of these 
transistor's flat region, which has increased tracking to over seven octaves." -PG

Barry (in no way affliated with any modular company - just a semi-retired recording artist)


--- In The_Cyndustries_List@yahoogroups.com, "Bryan E Cornell" <bcor@...> wrote:
>
> I wonder how the ZO compares to something like a Plan B oscillator which is intended to 
track over a smaller number of octaves than other super-accurate oscillators on the 
market.
> Bryan