Hello Friends
Weekend off-topic:
For CCTV systems,I can implement video switching of different camera outputs using 4017 and 4066/4051 aided by a 555 to view one channel at a time say after every 7 seconds.There is no problem except we cannot see more than one channel at a time.I understand that so called QUAD Switchers have PIP facility to view four channels at a time in a single TV(AV).I wonder if somebody has experience in this regard and can advise me how to proceed for making a QUAD SWITCHER.
AsokAsis