Hi, I am trying to design a circuit, where i am trying to light up an LED long enough based on my pulse signal. Here is what i am trying to do. a 10us pulse(every second) --->74HCT04 buffer---> (RC circuit)----> LED. since this is a 10us pulse, i want to make sure to light up the led for long enough time, so that one can see it. So i am trying to use RC time constant to add delay so that the LED remains ON for a longer time. I am not able to figure out the exact circuit for that and how i should design the RC circuit and how and where to place it with/before/after the LED. Also i am not able to figure out how to calculate R and C. It would be great, if someone can help me out. Any kind of input is appreciated. Thanks, Hary.