Would an LM1881 (sync stripper) help?
If I’m not mistaken, sync is transmitted via SCART pin 20, which is also used for composite video (AV).
Could the sync signal be too weak?
How could I amplify it?
I modified every console’s RGB cable to use a 9-pin D-Sub connector and built an adapter from 9-pin D-Sub to SCART.
The following signals are used:
Audio Right
Audio Left
RGB Blue
RGB Green
RGB Red
Aspect Ratio
AV/RGB Switching
AV Signal
Ground
After changing the following settings with the help of Google AI, I had a stable image for a few minutes (using the switcher), but then lost the signal completely.
Under sync options:
Analog sync Vth 157mV
Hsync tolerance 4.00ms
I am using the following switcher.
Since the SCART connectors kept coming loose, I converted them to SUB-D (using screw-locking connectors); for switching, I use mechanical switches from Inline.
When I connect my Sega Mega Drive 2 directly via my SUB-D to SCART adapter cable, the picture and sound appear briefly.
Does the OSSC require a higher signal level than a cheap device?
Yes, because I don’t want to constantly unplug and replug cables when I want to use a different console.
Furthermore, it’s very inconvenient since the cabling and switches are integrated into the cabinet.
Yes, all consoles are RGB capable and properly wired with SCART cables for RGB
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