On 19/12/2010 23:01, Mark Rages wrote: > On Sun, Dec 19, 2010 at 4:39 PM, Nathan House w= rote: >> I've made a PCB for the DIP version of the PIC18F4550, but now I'm tryin= g to >> make a board for the TQFN package of the 4550. I was wondering if you gu= ys >> would mind checking out my schematic and layout below and let me know if= it >> looks alright? >> >> Schematic: >> http://www.roboticsguy.com/images/misc/pic18f4550_tqfn_schematic.png >> Layout: http://www.roboticsguy.com/images/misc/pic18f4550_tqfn_pcb.png > If the DIP version of the circuit works, I'll assume your schematic is OK= .. > > I think that running ground and power in a circle around the board > might invite inductive noise pickup. Think "star," not "circle." Yes, better to try and run them together or use a plane. In general it looks fine, only thing I could see is on the power jack=20 input the LED seems to be the wrong way round. Also the part no (SFH482)=20 looks to be for an IR part? --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .