Andre Abelian wrote: > I am doing PCB layout that has 12v and 5v. 12v has 2A load > and it is used to power leds and 5v is to supply logic. > The board is only 4 layers and I am not sure about power plane > Should I use 12v as part of power plane or 5v. If they all have a common ground, make layer 3 the ground plane and route everything else as needed. It's rarely necessary to use planes for power. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist