[sdiy] Moog VCF output noise

[Kenneth Martinez]

Yup - turns out my Mini's circuit feeds +10V directly to the collector.

I'll see if I can make a .WAV file...hopefully the sound of the filter I
built is typical and I'm just being really picky.

Or, maybe I should breadboard some other Moog ladder circuits for comparison
purposes...adding to my project list again ;-)


">>>marjan<<<" wrote:

> > This circuit looks perfectly fine.
> > While I have not checked with an actual Mini, it works perfectly in my
> > own Minimoog clone.
>
> I opened my textbook and there it is, circuit without one collector
> resistor, so I digress, you're right. Different resistors 100k/220k
> are probably to set voltage across the resistor to fit the balance
> of sinking smallest base current in vbe>0.7 state and to keep it off
> (vbe<0.7) when leakage current makes voltage across the same resistor.
> So I was mistaken... And problem from the first mail is somewhere
> else obviously. 47ohm/100uF is just decoupling rc filter for supply
> rail. I wonder if cct woud benefit with better current source instead
> of resistor in common emitters.