Minimoog old style VCO

[Magnus Danielson]

From: jhaible at t-online.de (jh.)
Subject: Re: Minimoog old style VCO
Date: Fri, 29 Dec 2000 03:52:17 +0100

> > When Patrik said this I was really supprised, I did not know of this
> > "misstake". I mean, today we speak alot about thermal coupling, is
> > this maybe the classic misstake from which everyone learned from?
> 
> I learned it the hard way. When I built the Synthi Clone I foolishly
> thought I could have a single tempco for all 3 VCOs (by feeding
> the V/Oct CV into the "other" transistor's base (which is not
> connected to the matrix). "Electronically" this would work, but
> thermally it was a big mess.

Another misstake... OUCH!

It would have kind of worked if you used transitors out of the same
CA3046 or something. That is, if the transistors where thermically
well connected with each other AND the tempco. Break any of those
thermical links and the assumption is out the window.

Humm... the thermoelectric conductance property behaves like
electrical conductors/resistos and thermoelectrical capacitance works
kind of like electrical capacitors. I just wounder if there is an
inductance equalence... you could possibly do much better thermical
filters if they existed.

When you do owen oscillators will thermical filtering be of
interest.

Cheers,
Magnus