acl wrote:These may help, they are part circuit diagrams for Grahams NBTV to 625 line converter,
Thanks Chris. However it is a NBTV-624 up converter, not 625, i.e. non-interlaced....see the output stage of Graham's unit. In the days of analogue, generally CRT monitors/TVs this was fine, but now much of the signal is internally processed I'm not sure if a modern TV/monitor will accept it. Probably yes, but I don't fancy finding out the hard way!
Without the interlacing the display is effectively 312 lines at 50Hz instead of 625 at 25Hz...which would be fine in this application
IF the TV/monitor accepts it.
Again,
IF the TV/monitor works OK with a VHS source it may be OK...timing from a VHS machine was erratic/wobbly to say the least!..unless the VHS machine had a TBC (Time Base Corrector), the vast majority didn't.
So without further investigation I'm reluctant to go the 624 route, though potentially easier - it
may work on my TV/monitor, but yours?
Steve A.