[sdiy] VC Glide

[jhaible at t-online.de]

Jim Patchell schrieb:
> Take a look at:
> http://www.oldcrows.net/~patchell/archives/ca3280_7.html
> 
>     This circuit uses a CA3280, although, with a few 
> mods, you can use 
> either the CA3080 or the LM13600/13700 type OTA's as 
> well.  

[...]

>     Also, If you use a CA3280, you can make the shape 
> continuously 
> adjustable by having the Diode Bias Current being 
> adjustable as well. 

IMO, CA3080, LM13700 and LM13600 are no good for exponential
glide. Too much offset for playing VCOs in tune without
permanent re-adjusting.

The CA3280 has better offset specs, and I cannot speak for this one.
But I'd like to ask: Jim, how much offset variation do you get
with a 3280 in exponential mode (linear mode is never a problem),
when you vary the time constants across the full range ?

JH.