brian@ucsd.EDU (Brian Kantor) (07/20/88)
We have several Sun workstations here equipped with the old Sun-1 colour display board that seems to generate RGBS at North American (RS170A) scan rates. I'm contemplating building a simple RGB to NTSC encoder so that images can be videotaped, and I've found what seems to be the perfect chip for doing so: the Motorola MC1377. It is designed specifically for this purpose and needs a minimum of external components. It costs the distributor about $2 and so the small-quantity price to us is under $5. Apparently all you need to add is a 3.579545 MHz crystal, a small tuned transformer, a delay line, and various support glue to make it work. There's even a simpler version of the circuit that doesn't need the transformer and delay line (with a lower-quality output signal, of course!) Has anyone played with this chip? I've got a couple on order, and I'd appreciate any advice on things you've found out whilst playing with this particular chip. (I know there will other problems to solve, such as bandwidth-limiting the signals INTO the chip. I've built lots of little filters and delay equalizers and widgets like that before, so that's not a problem.) Brian Kantor UCSD Computer Graphics Lab brian@ucsd.edu