Minimoog filter question

[Alon nisenbaum]

---- On Jan 28 Alon nisenbaum <edgarfov at zahav.net.il> wrote: 
> Hi 
> I have constucted a minimoog filter from a schematics I'v found. 
> I can tell it works. didnt "scope" it for comparison yet. 
> And i wish to modify its self osciliation signal to make it stronger 
> its quite low .. peak measures gives a 1volt in all medium fruenicies. 
> when it goes to "sub" 1(10 -40hz) scope go flat line. 
> 
> Tnx in advance 
> aln 
> 
> 

To: Alon nisenbaum <edgarfov at zahav.net.il>  	
Cc: synth-diy at mailhost.bpa.nl  	
Subject: Re: Minimoog filter question  	
The Capacitors that couple the signal into the diff amp at the top of the
ladder (.22uF on the schematic I've seen of the model D mini) need to be
larger, they limit the frequency response. Also the 10uF that couples the
resonance pot could be bigger. Check the archives this was discussed in
detail, including clones that oscillate at low frequencies vs clones that
don't.
H^) harry

I did go through 3 archives so far , didnt find any help regarding
increasing the selfoscilation
signals.
But u did help me with the frequency range.its now much bigger, 
drops to real low freq. and won't  die. but it is a very low signal.
avarage of 500mv (750 mv till it gets to real low freq.)
For comparison , the SH101 gives self oscililation 1.5v(+-) steady all the
way 
to a total low freq. till the slider stops..
its a real big diffrence.
i wish to add that the Audiooutput at the first time i powered the filter
gave a very low signal.(didnt measure it but even the mixer didnt blink)
I tested the self osc. and audioinputs
So i have changed r35 to 10k closely as suggested for the formant type of
filter.
Now it works ok i guess. the signals show normal parameters+-
The question is was the low output at the first time i powered the filter a
fault?

Tnx for thy patient..
Al.