3 ms·
Seems like the overly saturated output could be fixed by putting a trio of potentiometers on the RGB output and using them to attenuate the red, green, and blue
by chongli 4y ago
Seems like the overly saturated output could be fixed by putting a trio of potentiometers on the RGB output and using them to attenuate the red, green, and blue signals until they look good.
- colanderman 4y agoYou also need a trio of op-amps to buffer the signal, else the pots add extra loading which will introduce artifacts. EDIT: actually, I wonder whether these are source+load terminated signals -- that is very common with analog video signals (e.g. VGA). In which case, if the amplifier the author was using doesn't load-terminate the signals, they will be 2× too large (a factor of ~4.6 intensity) when they reach the ADC. In which case, a ~75 Ω resistor at the end of each wire should do the trick, while also improving signal quality.
- chongli 4y agoOh yeah! I hadn’t even thought of that. I knew it was common for coax cables but didn’t know about RGB. That makes perfect sense though!