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:
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
>
>
>