Thanks Lars, this is a very useful information! My goal is to have patchable sync sources in my system, I don’t have any source of sync except a Vidiot and I can’t build, for example, a Castle VCO because I don’t have compatible sync sources.
One day I’ll probably try to build my VCOs or ramps but not before try to build one of those available out there.
Oh yeah, I read that you said something about this change, sincerely I’m a bit scared of SMTs (I’ve got an art degree 
nothing techie) on the other hand the circuit for LMH1980 looks easy to setup.
I guess is also possible to leave the HD detect flag disconnected without any issue; then remove C2, Q1, R3, and R10 from the equation.
Sure! I know this is a mantra for every IC, IDK I’ve placed a question mark in the draft, check this other scheme, I used them!
Got it, I’ll try to place RCA I/O on the back of the board, I promise!