A big name for a module “Trapezoid quadrature through zero VCO”. Well as you can see from the picture it is a big module for sure. I still need to calibrate this one and haven’t tested it a much as I would like too. I just needs some time with it to really tell something about it. For more background information be sure to check out Harald’s website.
https://www.haraldswerk.de/VCO/Trapezoid_Euro/Trapezoid_Euro.html
Difficulty to build:
Hard
Have you seen it size, lots of parts calibration and other fiddly stuff like matching parts