OSSC problem black empty output from C64 svideo signal via Sony S-RGB transcoder

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  • August 30, 2016 at 9:18 PM #8679
    Nrg
    Participant

      Ok, mystery solved. Problem definitely was/is the Sony S-RGB transcoder. Basicly the svideo signal had too big voltage level for the Sony to handle, so it got all confused and lost the sync on all-white scenes.

      I fixed it by adding some extra resistor on the luminance (Y) signal of the svideo cable to drop the voltage level. After that all-white scenes started working perfectly fine and the Sony transcoder doesn’t mess up the signal anymore!

      September 2, 2016 at 7:15 PM #8710
      BuckoA51
      Keymaster

        Nice, can I ask which kind of resistor?

        September 2, 2016 at 7:56 PM #8711
        Nrg
        Participant

          Sure. It was 75 ohm resistor, but that was chosen totally randomly, meaning it was the smallest one I had available. I’m going to try different values in the coming weeks when I get my order from the electronics shop delivered, so I have different resistors to try.

          So 75 ohms was enough to fix the problem. I think smaller is probably enough.. I’ll find out.

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