Is any simple circuit available for countdown timer to start from no more than 10 sec ( can start as low as 3 second and go down.) On 0:00 sec relay activates, It should be able to use 7 segments display. What I want to make is something like clap board for movie clips for sinhronizing cameras. ON flip of a switch, red display start from, let's say 3:00 SECONDS, When it comes to 0:00 secs, relay should be activated, on relay I could connect LED light so something will get both cameras visible signal for first frame. It can work without LED light and relay, but it is easier to notice light than read numbers. Thanks
Boban Klasnikov
Boban Klasnikov