If I use an LM1881 IC to strip the H and V sync off of an EIA RS170 sync on green video signal (NTSC?), could I then apply the RGB video lines and sync signals to a standard LCD or VGA computer monitor?
The RGB video signals are 0.7V analogue, 16kHz Horiz, 720 x 540 dots/lines resolution.
The other problem is finding a source of 12 to 13" Monitors, Google has turned up a few overseas but none in Aus.
Is used gear ok? how about an 80's analog computer monitor (eg commodore 1084). Shouldn't be hard to find one on ebay.
If you don't mind a not-so-perfect image you could simply use a TV as a monitor, just find one with a SCART socket. The only problem I can see here is that TVs with SCART don't usualy come any smaller than
19". Though I've noticed that some small TVs (esp from sharp, samsung and lg) use a signal processing IC designed to accommodate a SCART connector, so modifying the TV for an RGB input is trivial (3 terminating resistors and 3 coupling caps).
the mc1377s are pretty crappy...there was one of them in my old amiga modulator - 80 col text was unreadable
maybe the newer encoder chips are better... if you could live without colour you could just sum the red, green, blue and sync with a fast op-amp to make monochrome composite
Give the TV/SCART modification a try - it's a bit easier that building a CVBS encoder circuit. All the LG tvs have a spot for a SCART socket (I just had a look through my archive of LG circuits and they all have this) on the PCB (under the AV sockets). It's simply a matter of removing the AV socket block, putting in a scart socket, installing the missing termination resistors and a few wire links.
I'm pretty sure the samsung ones are like this too but i've got no circuits for 14" samsung tvs so I can't be certain.
pulling pin 8 of the scart to 12v and pin 16 to 2v will force the TV into RGB mode and act as a monitor. The Sync goes into the video input