In this project, we will make a 4-Channel Relay Driver Circuit for relay based applications. In this circuit, we have designed an isolated PCB for 4 relays. By using this Relay Board, we can operate 4 AC appliances at a time. We have put a three pin screw terminal blocks (NC, Nuteral, NO) for connecting appliances. Here we have provided PCB layout, circuit diagram and gerber files, so that you can build or directly order this Relay Driver Module.