Interference on the component input?

[coderkind]

Hi,

rather than double post, I’ll link to what I posted over on the shmups forum a little earlier: http://shmups.system11.org/viewtopic.php?f=6&t=50851&p=1272354#p1272354

See first post by “coderkind” (page 49).

In a nutshell however, I was finding issues when I had a component switcher plugged into the OSSC but not switched to that particular channel (wavy image on SCART, discoloured image on SCART). When I disconnected the component switcher the issues on the active SCART channel went away.

I would’ve thought the OSSC would totally ignore all non-active/selected channels (or perhaps it does, but my unit is displaying an issue)? So if I’m switched to SCART input and that’s what I’m seeing, I wouldn’t have thought anything potentially coming from the component or VGA connectors would/should cause any issues? That’s seemingly what I’ve experienced however.

Any thoughts welcome, as it looks like I either have to buy a different component switcher, or have component connections totally disconnected when playing SCART consoles.

[paulb_nl]

Does the same thing happen when you connect an active component source directly to the component input?

[coderkind]

Not sure; debugging the problem was literally the last thing I figured out before going to sleep last night. Will try things with an active component connection tonight/tomorrow and follow-up on this.

[rebrove]

You don’t happen to be mixing formats (NTSC/PAL) for your sources, do you? I had a similar enough issue with the wavy/discouloured image where the culprit was my PAL Gamecube being a part of an otherwise fully NTSC setup. I know there are a lot of folks that swear that you can use a US power supply on a European Gamecube without any interference, but I had to splice a US plug on the European power supply because the 60Hz power and the 50Hz output was creating a visible issue on everything that passed through the OSSC (SCART/Component/VGA).

It might not be the case for you, but I didn’t have any issues after adapting the 50Hz power brick.

[paulb_nl]

@rebrove Is it not possible that your US power supply went bad? I used a euro power supply on an NTSC gamecube today without issues.

Did you only exchange the plug on the European power supply? Mine is rated for 230 volts only.

[marqs]

Yeah, it sounds more like a bad PSU.

The original issue is probably caused by ground loop(s) – is the component switcher passive or active btw?

[rebrove]

@paulb_nl It’s possible that it was a bad supply as it was an aftermarket unit, but the wavy image came with a darker horizontal band like you see when recording a CRT with a video camera where the refresh rates don’t sync.

But yeah, all I did was steal the plug off the US power supply and used it as a replacement for the plug on the European power supply that I’d received when I bought my GameCube.

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