Another from my backlog of modules - a modified version of the Nonlinearcircuits Triple sloth module:
Getting this working properly was a bit of a saga! I started off using this schematic (for a double sloth) which uses higher value capacitors for the slower sloth. It worked well for the faster sloth on a breadboard but I couldn’t get the slower one to work, even after creating and studying a CircuitJS1 simulation. There’s also a schematic for the triple sloth using high value resistors for the slower sloths. At the time I couldn’t find a source for for the 68M and 100M resistors needed, so put this project aside for a while. Some time later I needed to buy resistors for another project and found a Chinese supplier of high value resistors on one of the usual auction sites. With these in hand I could get the slower sloths to run satisfactorily. With the help of my circuit simulation I tweaked some of the resistance values to get the maximum possible range of control over the oscillation behaviour of all three sloths, including adding a control potentiometer to the slowest (Inertia) sloth.
There was considerable variation in amplitude of the outputs, and I wanted all outputs at Eurorack levels ≈ ±5V, so I modified the circuit to allow either amplification or attenuation of the X outputs and tuning of the amplitude of the Y & Z outputs.
As usual the details are in my Github repository, including the full schematic, a PCB layout with all the alternative resistor positions for the output gain options, and a copy of the CircuitJS1 simulation to download for local use.