Hello, I am new here, and have very limited circuit design abilities, so please be patient!! I am working on a project using a pre-designed flip flop relay board. The working power will be converted to 12vdc, and will be turned on by the application. I need to create a negative pulse each time the power comes on to switch the relay. I saw a circuit using a 555, but that was switching the positive side. If you were to ask the length of the pulse, I could only guess at .5 second. I don't presently have the board in hand, so I don't know if I can simply keep the ground applied until the power off. Any suggestions with a drawing would be most apricated!