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. 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.
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