Extruder Controller v3.7 Dual Head

I wanted to buy an Extruder Controller from Makerbot but they are out of stock. And have told me that they are not likely to get any back into stock soon. So I decide I will make one and find out that three of the components on the board are no longer manufactured! So I decided to redesign the makerbot's extruder board and here is a drop in replacement.

It's been designed to be dual steptrude compatible as I have removed the DC motor controller (As the have stop making that chip and upgraded