I’m currently building Moritz Klein’s Shapes VCO.
I’m following this schematic, although there are a number of variations (including a v2 with triangle wave output) on Moritz’s YouTube channel
I’ve bread-boarded the circuit and translated it to a stripboard layout (unverified)
I used DIY Layout Creator to create the stripboard layout.
Still to do: double check the stripboard layout, build and create a panel.