WDF would be one way, nodal analysis or modified nodal analysis another one.
However, in this case you should be able with help of a software, which deals well with symbolic math, to figure out the transfer function by “reducing” this circuit to a complex voltage divider. Just by fusing together parallel and serial resistances and applying a series of star-delta-transformation or delta start transformation. In the end, you have two super complex resistors, which represents the circuit as a voltage divider. Then you apply a bilinear transform, ending up with a 5th order all real pole filter. Plus some zeroes. For hardware, you can use then star delta transformation only for elements of the same kind, but for circuit analysis, this doesn’t apply, you just get complex elements. I did that for the Fender tone stack and it turned out quite well. Best, Steffan > On Nov 29, 2023, at 09:09, Jens Johansson <jmobile...@gmail.com> wrote: > > Been lurking for 20+ years off and on :D > > I would finally like to ask for some advice. I have this idea to simulate a > guitar stomp box (a Morley JD-10). Most of the filters are simple RC type > circuits which I think (hope) that I can figure out by analyzing, farting > around in LTSpice, and then using some of the formulas from the Audio EQ > Cookbook. > > However, there is an EQ section which doesn't quite fit into those molds. Or > does it? > > What would the esteemed mailing list's advice be, is it even possible to > analyze 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"? > > Cheers, > Jens > <Screenshot - 11_29_2023 , 6_37_59 AM.png>
