Those cheap cables are definitely "you get what you pay for" cross-talk garbage. Honestly, you'd be better off just getting a quality S-video cable and call it a day.
Just out of curiosity, what kind of price point are you looking to hit for a mod like this? If Tim's board is too much, tough sell.
The only problem with Tim's board is that shipping is almost as much as the board. If it were $25 shipped I'd definitely grab it. But I also don't mind building one myself, but all the schematics I can find for that type of device also do Y and have way more components than Tim's design.
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Just out of curiosity, what kind of price point are you looking to hit for a mod like this? If Tim's board is too much, tough sell.