#Audulus patches generator#

To replicate the Quantussy signal flow, the four sections can be patched in a ring, such that the Triangle out of each patches to Castle in of the next, and Castle out of each patches to the CV in of the next. Patching replaces the solid state switching used in the Quantussy. I added a panel pot to control the slew rate of the вЂCastleвЂ™ S&H. The right S&H input and output (labelled вЂCastle inвЂ™ and вЂCastle outвЂ™) are available for patching, but its hold input is always being clocked at 2X the rate of the VCO. (This is due to the fact that the one-shot triggers on both the rising and falling edge of the cycle signal.) This allows the VCO to be controlled by a CV in the normal manner or to sample the incoming CV at a rate of 2X the frequency of the VCO, just as in the Quantussy. A panel switch allows disconnecting the Hold input, with the result that the CV will be tracked at the output, effectively bypassing the S&H. The slew rate for this S&H is internally set to the maximum. This corresponds to the S&H in the Quantussy that accepts castle inputs. The left S&H accepts an input, labelled CV in, and its output is hard-wired to the CV attenuator pot of the VCO.

#Audulus patches generator#

The one-shot output, a short negative pulse, is routed to the Hold inputs of the two sample and holds, which are like the Stepped Generator of the SSG. Its cycle output, besides being patched to its own input, is hooked to the dual-edge one-shot circuit in the SSG. The VCO block is a Smooth Generator, internally patched to self-cycle. The block diagram above details one of the four identical sections.

(Five for the 10 S&H and three for 5 VCOs.) The number four makes for a better board count, using two SSGs for 4 VCOs and four SSGs for 8 S&H. Replicating the Quantussy would require eight SSG boards, with one unused circuit. Then the CGS Serge SSG came along! It has two circuits that can work either as a triangle wave VCO or as a S&H. I looked at a number of simple VCO and S&H circuits, but the task of breadboarding these or designing a circuit board was too daunting. This topology, combined with the switching matrix that selects inputs to the sample and holds, gives the Quantussy its amazing properties. вЂњIt is a result of sample and holding another oscillator at the speed of this oscillator.вЂќ The output of the S&H looking at the castle output of the other VCO is fed into the FM section of this VCO through a VCA to become the chaos modulation.

Peter calls the output of the S&H to the right in my diagram the castle output. (The selection of which other VCO is made by a solid state switch controlled by a logic circuit whose status is given by three LEDs in the central lozenge.) One S&H receives the triangle output of the selected VCO, while the other receives the castle output of the selected VCO. At any given time the inputs to the sample and holds come from one of the other four VCOs. It is comprised of five triangle wave VCOs, each clocking a pair of sample and holds (S&H). calls the Quantussy section, I began to wonder what it would take to build a modular version of the Quantussy. After I had sussed out the Cocoquantus schematic and understood the internal relationships among the five oscillators that Peter B.