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