ypbpr

(Today is National Retro Day) I'm adding HDMI output to my vintage Atari 800XL 8bit computer to project it on my large TV. I'm a novice. I've built a circuit for "High Speed Analog RGB to YPbPr Converter" using an LT6559 & LT1395 to "map RGB signals to YPbPr". It doesn't seem to work and it...