Hello Can someone help me with this? I've been struggling with it for some time and haven't found a solution yet. Let's say we have the circuit in the attachment. There is a number of inputs (4 in our case) and an equal number of outputs. The problem is: if at least one input is HIGH, then one and only one output will be HIGH. And that one will correspond to the last activated input. Fore example: lets say that only A(in) is 1. Then only A(out) will be 1. After some time, B(in) is also 1. Then B(out) will be 1, A(out) changing back to 0. If after some time D(in) is 1, then D(out) will be 1 and the other outputs will be 0. And so on... Can someone tell me how this might be done? Have you encountered something similar untill now?