Thank you for all your great advice so far! It gives some really good hints which trees to consider barking up, so to speak. Well, I first have to become multicellular, and evolve eyes, then find the trees, but you get the idea.
I enclose the full schematic if anyone's curious, my guess was that the first three filter stages (C1R1, C3R2R3, and C4UA2) could be approximated with stuff from the cookbook. Just loading the schematic into LTSpice seemed to confirm this somewhat. Also the stages after this more complex "fifth order" section (C9R7?, C12C13R11R12C14A) looked like they either are inconsequential or kind of map onto the more normal filter cookbook topologies too. The "N" ground is the midpoint between the two power rails for the opamps. The "ground ground" is the negative rail. (It's not the greatest distortion box and also not the worst. Peak 1990 technology. On the other hand my hope is that a simulation could run in a couple of hundred CPU cycles and not need either bluetooth, AI or a built in web browser. I was planning to just slap the code on github if I ever got it working. I would use JSFX because it's so easy to prototype stuff in this language) Cheers, J On Wed, Nov 29, 2023 at 10:51 PM brianw <[email protected]> wrote: > On Nov 29, 2023, at 1:49 PM, brianw <[email protected]> wrote: > > On Nov 29, 2023, at 1:28 PM, robert bristow-johnson < > [email protected]> wrote: > >> On 11/29/2023 3:09 AM EST Jens Johansson <[email protected]> wrote: > >>> and simulate the below circuit just with simple(r) feed-forward and > feedback algorithms, or is it so complex that I would have to take the step > how to learn to deal with those "Wave Digital Filters"? > >> > >> I am curious about C6. What does that "4n7" mean? Is that just a typo > and it's just another 47 nanofarad cap? And what does R7 connect to? What > is "N"? Is it another kind of ground? Or is it some buss somewhere? > > > > "4n7" is a shortcut that engineers like to use for "4.7nF" - the > standard is to move the unit to where the decimal place belongs, and that > saves a digit. > > It's also the case that a decimal point '.' can easily disappear on a > printed or hand-written schematic, so placing another symbol in place of > the decimal makes it much more visible. > > Brian >
