Can I use both copper layers for a single, higher-capacity connection? Answered
My application involves some fairly high currents. I have widened the traces as much as practical, but would still like to increase current carrying capacity. I can specify heavier copper layer thicknesses, but PCB costs increase dramatically going from 2 oz/ft2 to 4 oz/ft2. The circuit is simple and will fit on one layer. It seems I could double the current carrying capacity by specifying the same circuit on both the top and bottom copper layers. If I could do this, I could get the current carrying capacity of a single 4 oz/ft2 layer by using two 2 oz/ft2 layers, which would be much more economical. In Eagle, however, once I have connected two pads together in the top layer, I cannot figure out how to also connect them together in the bottom layer. Any comments or suggestions? And thank you for a great tutorial.