24 db/oct filter schematic

[cmacdon at ix.netcom.com]

Hi Jorgen,

jorgen.bergfors at idg.se wrote:
> Nice schematics! Just a few questions:

Thanks!
 
> There is no offset adjustment. Maybe this isn't necessary? Have you thought about this?

Yes, there should be trimmers to eliminate offset (well, I think so
anyway).  But since I haven't tried them in to my prototype circuit yet
I thought it would be misleading to put them in the schematic.  I've
learned not to draw anything that I haven't tried first, no matter how
"obvious" it seems!  :-)  So I wouldn't consider the circuit "final",
but I wanted to post it because I had been asking questions about it in
an earlier post.  

(The offset in my particular circuit isn't too bad BTW, 1 to 2 volts
depending on the output chosen, but still, it is there.  It probably
would be different from chip to chip as well, true?  Hmm, now I'm
wondering if different offsets from stage to stage would affect the
sound of the filter?)
 
> I don't quite understand why the timing caps are of two different values. I thought they all should be the same. Can you explain this?

I saw your latest post so I don't need to answer this I guess, but I
suppose I should probably put a note on the schematic explaining the cap
differences too, in case someone sees it without the context of this
thread!

-Chris