You're right, my voltage goes to zero (i don't know what i was thinking
)
I have to be a "little" worried... Imagine this case:
in a toilet, my valve is closed (no water flows) and somebody remember to remove one battery! What happens - my water starts flowing (because there was a impulse to open my valve). This situation only stops when somebody put again my batteries...
I already tried to put CD40106, but nothing... Still appears one impulse when i drop my voltage rapidly to zero (simulating removing the batteries).
I already removed 4538 to put a 555 and the problem is the same.