For example, a trace drawn on a copper layer results in copper existing on the board. This is conveniently and accurately realized by using a stencil, but equally easily ruined when a component is not placed correctly on the board (and in the paste) in one go. Save your board, exit pcb, and run gsch2pcb fb-smt.prj. Go back to pcb, import and disperse the new elements, and load the netlist. As before, move the labels out of the way and size them accordingly. See “drill file”. negative layer negative plane For most drawing layers, the stuff you draw corresponds to stuff that exists in a physical layer. Now, we’re going to set the default position of the label.
Locating the next component to place, by skimming through the bill of materials and (enlarged) print-outs of the silk-screen images, then, is a «distraction» to say the least. You can change the size of pins, pads, traces, and even silk this way. The first is for our power jack, and is a purely custom symbol. Press the / key until _/ is shown (this is the default when you start pcb) and connect the left resistor pin to the top header pin. From Wikipedia, the free encyclopedia Jump to: navigation, search PCB is a free and open-source software suite for electronic design automation (EDA) — for printed circuit boards (PCB) layout. It uses GTK+ for its GUI widgets.
Shut off the GND plane and “find” the VDD net again, to highlight which rat circles (and thus their vias) need to connect to the power plane. There are a few key things you need to keep in mind when using the autorouter. The second symbol is built from this 555.symdef file: [labels] 555 refdes=U? [left] 7 DISCH 6 THRESH 2 TRIG [right] 4 RES 3 OUT 5 CTRL [top] 8 VCC [bottom] 1 GND and looks like this: Now, using those symbols, create your schematic, and name it fb-blinker-sch.sch. When used to cover traces routed between pins or pads, this can help avoid shorts to those traces.