When inserting devices with polarity needs, concentrate to ensure that their polarity is notreversed. Roll built-in block components after SMT. No matterwhether They may be vertical or horizontal areas, there need to be no evident tilt. The minimum gap diameter of mechanical drilling capability has dropped from 0.4mm to 0.2mm https://six-layer-high-frequency73827.blogscribble.com/31287097/how-six-layer-long-and-short-gold-finger-pcb-circuit-board-can-save-you-time-stress-and-money