I'm a beginner so please bear with me if I use terms incorrectly. I would like to build a circuit that will remember if a voltage of an input signal has dipped below a threshold. I have an input signal that normally has a voltage of 5v that at times momentarily drops to about 0.
I want to make a circuit that takes my signal as input and outputs 5v until the input signal drops below 2.5V. Then I want the circuit to output 0V, even if the input returns to a higher voltage. It would also be fine if it returns to the higher voltage but much more slowly.
Is there an official name for this type of circuit? Thanks for any advice!! :)