Quadratron kit

The Quadratron is a four-stage optical phaser first released in 1995. Each of the four optical phase stages has different filter frequencies, with each stage having a capacitor twice as large as the previous stage. Each pair of stages has its own depth (intensity) control, called Low Frequency Span and High Frequency Span, and each pair of stages can be controlled by a single LFO, separate LFOs, or a single LFO with each pair out of phase with the other (i.e. when stages 1 and 2 are off, stage 3 and 4 are on). Each pair has its own rate/depth LED, so throughout each of the modes there is always a visual representation showing how the signal is being modulated.

This kit contains the PCB and all necessary parts. The enclosure can be selected, please select 6 knobs, up to 19mm diameter, for 6,3mm shaft separately.
Here is the bill of material: bill of material

This project is by Aion Electronics, in collaboration with Musikding. If you have any problems with the contents of the kit, please contact Das Musikding (Klaus). This an advanced project, do not build this as your first project!

Here is the direct link to the manual with layout and schematic:
Instructions