Minimoog VCF

[jorgen.bergfors at idg.se]

>A working version of the all-transistor
>filter can be found at http://titan.cs.uni-bonn.de/~schmitz/rsmoog.gif'

Hi Rene

I have a couple of questions regarding the filter.
I get the impression that you have actually built it and that it worked as it should.
I'm a bit surprised that you could change the supply voltage from 10 to 15 volts without changing a lot of resistors.
The only changed resistors that I can find are R70, R74, R6 and R7. This surely has to do with the CV range and the resonance.
The voltage at the range pot is still 10 volts. Is this intentional?
Have you tested the temperature stability? Should Q26 and Q28 be in thermal contact? Would it be a good idea to use a tempco resistor for R70?

/Jorgen