Morning All, I will try and keep this short. I am new to the board so I appreciate any help I can get. I am looking for help to design a circuit that runs in a 12V dc environment, and is triggered by a constant + signal that once below a specified voltage (4v) it creates a output (+12) for a relay. The catch is that it has to be able to filter out short period drops to 4v. What I mean is that if the voltage on the input is below 4v for say 3-5sec, then the output is given, if not the circuit stays open (no output). Any help would be great. Thanks again.