NEW 625 SCOPE LINE TRIGGER UNIT
One of the problems ATV chaps have is being able to see on an oscilloscope on any particular line or position within the two frames due to the nature of the interlaced video..
This is a simple tool that will do this very well.....and work on most Scopes with EXT sync capability...
I used a ispMACH4 44pin PLCC device that now has a 3 decade line counter a 3 decade position counter and a 12 bit comparator....Also decodes the 3 decade position counter into 3 X 7 segment LED MUX drivers....
Other clean up and gating logic.....Locked onto a 1MHz Clock...EXO3 chip.
The Video first goes into an LM1881 Video Sync Separator then into the isp MACH4...........
Special delays are incorporated to clean up the Frame Equalizing pulses
MK2 LATEST VERSION
TYPICAL STEADY SIGNALS ON A NORMAL OSCILLOSCOPE
(C) G3RFL 2003