scr triggering problem


Joined Nov 23, 2015
it would not trigger the gate when I hit the switch.
can anyone please explain to me why it wont work and suggest some solutions.
any suggestions would help
see the picture below
The data sheet says max gate voltage should be 5 V, but I don't think that should prevent it from operating. Yes, 120 ohm looks right. You may want to limit the gate voltage.


Joined Mar 14, 2008
If S2 is closed then I seen no reason that the SCR shouldn't turn on when you close S1. :confused:
Are you certain that the SCR is wired correctly per its pinout shown on the data sheet?