Well... my Steiner filter sat on my work-bench for months. I worked on it
so much that the solder contacts on the board to one of the 2n2222's were
destroyed after swapping transistors too many times. I had just about given
up on it.
I swapped the 2907 with a 3906, and swapped the 1k resonance pot with a 2k
pot, removing the additional 1k resistor. This did the trick - my Steiner
filter goes from smooth to really buzzy, and I'm in love with it! Thanks
for the tip Ken!
-gerald
so much that the solder contacts on the board to one of the 2n2222's were
destroyed after swapping transistors too many times. I had just about given
up on it.
I swapped the 2907 with a 3906, and swapped the 1k resonance pot with a 2k
pot, removing the additional 1k resistor. This did the trick - my Steiner
filter goes from smooth to really buzzy, and I'm in love with it! Thanks
for the tip Ken!
-gerald
On 1/22/06, sasami@... <sasami@...> wrote:
>
> >One more question - my Steiner filter doesn't self-modulate, but other
> than
> >that it's working fine. It does ring a bit (can see it on a square
> >wave-form), but not as much as some samples I have heard on the web. I
> have
> >changed the 1k resistor just above the res pot in the diagram to
> something
> >else (can't remember what right now), and that helped, but not that
> much. I
> >tried different 2N2222 transistors, thinking that maybe it was
> responsible,
> >but it sounds the same. What else can I try to beef up the resonance?
>
> Use a 2k pot instead of a 1k pot perhaps. Also you could chanve the 2907
> and
> 2222 for 3906 and 3904 (or even just one of them. That should give you
> more
> gain.
>
> Ken
> _______________________________________________________________________
> Ken Stone sasami@... or sasami@...
> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>
>
>
> The CGS Modular Synth home page: http://www.cgs.synth.net/
>
>
>
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