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It's like running Composite through an S-Video input, it's disgusting. Doing so will not induce subcarrier noise, but instead induce something that I think is even worse to look at: a diagonal mesh pattern. At the same time, I suggest that you NEVER use Composite video as sync on a Super NES or RGB-modded Nintendo 64 (those with a separate video DAC and encoder, at least). On a Genesis, you really should not use Composite video as sync as Villahed mentioned, using Composite video as sync results in more noticeable subcarrier noise. The workaround I found involves the addition of an NPN transistor on the Composite Sync output of the multi-A/V out, which I described earlier. In fact, I was informed by Villahed that in Version 4, the Composite Sync is so weak, it becomes completely unusable with the circuit. I had no issues using Composite video as sync on Version 3 of the circuit, though I will say regarding Composite Sync on the Genesis, half the time, it's completely unusable. I will also note this setup works just as well with the Master System even though its Composite Sync output doesn't need a transistor. Make sure you use v4.0 of the circuit as you absolutely need the 75ohm pull-down resistor on the LM1881's Composite input with the Composite Sync being buffered through a transistor on the Genesis. I suggest you use Composite Sync instead of Composite video as sync since the subcarrier noise in the Genesis' RGB output is less visible with Composite Sync going into the circuit.
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If you're doing an internal Component mod on a Genesis, you can just use Composite Sync from pin 11 of the CXA1145 through a 75ohm resistor and 220uF capacitor. Emitter to the Composite input of the LM1881 Base to the Composite Sync from the multi-A/V output Also, if you use Composite Sync from the Genesis, I recommend you add a transistor to the Composite Sync output from the multi-A/V out as follows: I don't know about the AES, but on the Genesis, you need 75ohm resistors in series with 220uF capacitors on the RGB outputs.