I am trying to make a steady hand game with latch.
It works perfectly fine in simulation and also work on a breadboard with real stuff. The mystery is it works when power is 5V and do not work when power is 9V or higher. All transistors are rated to much more than 9V.
I am using IRF530N and IRF4905.
Game works like this: you take the rod that rod that is connected to VCC, and you can touch 3 contacts, start (reset), the wire of the game (triggers fail led and latches), win game contact (opens the lock). When fail is latched the "WIN game contact" do not open the lock so you can't cheat.
For some reason when power is 9V when I touch the "WIN GAME" contact it triggers the "Fail latch". Almost as if the current floats from source to gate of third transistor, very strange. I tested all transistors, they seem fine.