Thanks for the summary, Richard. I did find some of your postings in the
archives. I think that you mentioned that you were going to try other ICs
also. Did you ever do that experiment? Was there anything to be gained by
changing op-amps?
Thanks--
--Adam
archives. I think that you mentioned that you were going to try other ICs
also. Did you ever do that experiment? Was there anything to be gained by
changing op-amps?
Thanks--
--Adam
> -----Original Message-----
> From: Richard Brewster [mailto:pugix@...]
> Sent: Saturday, May 07, 2005 10:42 AM
> To: cgs_synth@yahoogroups.com
> Subject: Re: [cgs_synth] Re: My first CGS module up and running
>
> I made the following small mods to my Wave Multiplier:
>
> 1. Added a 100pf cap between pins 1 and 2 of IC1 (Grinder) to prevent
> parasitic oscillation.
>
> 2. Added a 1K resistor to ground at the Grinder output to cut the
> amplitude in half. It can swing to +/- 14.5V otherwise. This mod
> limits the maximum swing to about +/-7V. You might use two 2K resistors
> here to reduce current consumption.
>
> 3. Changed to a 33K resistor (from 100K) on the Folds CV input (I have a
> pot on this input) for increased sensitivity.
>
> 4. Changed to a 100K resistor (from 47K) between pins 1 and 2 on IC4 (I
> have a pot on the PWM input) for increased sensitivity.
>
> 5. Changed the pulse output (IC4 pin 7) to use a series 3K3 to 1K8 to
> ground, as on the CGS56 board, to limit the output to +/-5V.
>
> Be sure to check the archives for information about tweaks to the
> Steiner filter. I seem to recall posting my method for matching the
> transistors, which is a good idea.
>
> -Richard Brewster
>
> Adam Schabtach wrote:
>
> >Thanks for dropping by my website. Yes, the Digital Noise does get really
> >crunchy at low frequencies--it's really fun, and adds a very different
> >flavor to my system.
> >
> >The Wave Multiplier is in fact the next CGS module that I will build. I
> >purchased the PCB at the same time that I bought the board for the
> Digital
> >Noise, but I haven't yet started putting it together. If anyone has any
> >interesting mods or tweaks for the Wave Multiplier, I'd appreciate
> hearing
> >about them. (Yes, I'll search the archives, too.)
> >
> >Yesterday I ordered PCBs for the Steiner filter and the Bi-N-Tic, so
> those
> >will come next.
> >
> >--Adam
> >
> >
> >
>
>
>
>
>
> See the following URLS for the CGS Modular Synth home page:
> Main: http://www.cgs.synth.net/
> Secondary: http://otherunicorn.0catch.com/synth/
> Yahoo! Groups Links
>
>
>
>
>
>
>