I am still a student and so this question might sound too easy to be asked here, for which I apologize.
I want a circuit that consists of a single LED. When this LED recieves a 0V potential difference, it should turn off and when it recieves a 5V input, it should turn off. Although this sounds like a NOT gate, but there is a complication. I want the circuit to work like this. At the beginning, when no input (0V) is provided, the LED should remain OFF. Then a timed 5V input is provided for some time, for which the LED should remain OFF. After that when the input is 0V, the LED should turn ON.
I have searched the Internet for any solution but in vain. Please help me with this problem if you know any possible way to achieve the above mentioned work. Thanks for the attention.
Figure 1. Timing diagram added by @Transistor for the OP to edit. 'T' is the minimum required on-time.
_________ ___ ________ Input: ______| >T|_____________| <T|_____________| >T|_______ _____________ _______ Output: ________________| |__________________________|
- Output turns on if input pulse has been longer than T.
- Output turns off on rising edge of input.