Safe RGB/Sync Voltages for OSSC

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  • July 30, 2019 at 4:11 AM #27194
    fatherted
    Participant

      Is there a limit to the voltage for the RGB lines going into AV1 of the ossc? (Scart connection)

      I have a consolized MVS and I know you will want the CSYNC voltage down to 0.3-0.6V from the usual 3-5V you might get without a 470 Ohm resistor on sync line with 75 Ohm termination to not fry the OSSC over time, but is there a safe range for the RGB lines?

      I’ve been trying to fine tune the Color bar test so that the RGB bars don’t bleed out as far on the last 3 bars. I’m going to rig up some pots or some resistors to sort it out, but was unsure what voltage can/should be sent to the AV1/Scart input.

      Some say you need anywhere from 150-250 Ohms, to get it right with some 220uf caps as well.

      Thanks,

      July 30, 2019 at 3:18 PM #27198
      nmalinoski
      Participant

        I’m no expert, so perhaps wait for someone to validate this, but I believe the voltages for both RGB and sync are 1Vp-p, -0.3V to +0.7V, which goes for AV2 as well, and I think the video lines on AV3 (sync on AV3 still needs to be TTL/5Vp-p).

        July 30, 2019 at 5:21 PM #27200
        paulb_nl
        Participant

          RGB video lines should be max 0.7V p.p but it is obvious when it is too high because then the brighter colors will be clipped at default gain.

          July 30, 2019 at 11:03 PM #27210
          fatherted
          Participant

            That’s great – a big thanks to both of you. All my lines are in those ranges so should be okay.

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