It allows you to design your schematics and PCB without downloading and. Un-used pins on the stress-sensitive component package are routed a minimum distance from the pad, just like the used pins, so that when soldering using reflow or infrared techniques, all the solder on the pads melts and solidifies at the same time, reducing the stress on the component. gEDA includes a rats nest feature and schematic/netlist import, design rule. Stress Relief AntennasĪntennas can also be used for stress relief during soldering for stress-sensitive parts, such as accelerometers and gyros. This one seems to be more complex than eagle with better(complex) features like rats nest feature, design rule checking and industry standard. Having the schematic visible also lets you place the components in a logical manner. However, the schematic show (hopefully!) that it is associated with the power input to an IC, and therefore should be placed next to the IC. A rats nest will only show one pin connected to the power rail, and the other to ground. This will help to guard against broadside crosstalk problems. If you have adjacent signal layers on layers 2 & 3, then route one horizontal and the other vertical. Sometimes it is not obvious from the rats nest to where a component should go. Here are some multi-layer pcb design tips that may help: Route adjacent signal layers in opposite directions on the printed circuit board. Either print them out or put them on a second monitor if you are lucky enough to have one. Moving between schematic and layout leaves room for ambiguity, and it is up to the to route traces such that crossover is minimized. Having schematics in-front of you when routing is a must. Screenshot during the routing of a track on a PCB in Altium.
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