1. Trace connecting two pads! More than 45 degree bends Traces too close together Rule of thumb: traces at least 40 mil apart

2. Terminate traces into headers on the bottom trace (blue) When Terminating traces into through hole components its easier if they terminate on the bottom layer, but not required.

3. Trace Layout When changing directions with traces, use 45 degree angles. Don’t use 90 degree angles. When changing layers through a via, its ok to have them meet at 90 degrees.

4. Don’t have a trace go through two pads when etching own circuit board. Trace width must be a minimum of 40 mills Buried Via’s, Don’t have Via’s under a component Via to close to Pad