Luma encoder DIY?

So I was linked to this thread recently and have been thinking of making a similar luma encoder for a preview monitor. I am wondering what the best way to replace the 14pin sync with RCA sync and pass through. I believe lm1881 would be the chip to use but just wondering what the best way to go about this is.

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Looking at the C2 schematic (see relevant bit below), the C2 only uses the csync and blanking signals from the 14-pin sync. Csync is definitely one of the outputs of a lm1881 (and I think it’s what an RCA sync signal is in general, right?). But blanking will need to be derived somehow. I’m not sure but I think it’s the kind of thing you can get by rigging up a one-shot of a particular length (tuned via trimmer?).

C2’s 14-pin sync input:


yeah I found this reference about using the cd4638 but I’m not exactly sure. I think a lot of the schematic I have drawn up is overkill.

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I’m somehow a little surprised there’s no video on YouTube about this IC.