Daniel MillerJoe QuesadaJustine
Lazo*http://saturnpcb.com/pcb_services.htm
OverviewWhat is a PCB?Why use a PCB?How do I make a PCB?*
Printed Circuit BoardCircuit connects components through
boardMade of alternating layers of conducting and insulating
materials*http://www.seilpcb.co.kr/products/images/2_1_img5.gif
Why PCB?FeaturesSurprisingly AffordableHighly
reliableCompactDrawbacksRequires more layout than other board
typesHigher initial cost than wire wrap or point-to-point
construction
PCB Design StepsDesign the circuitPlace the componentsRoute the
wiresManufacture*
EDA SoftwarePCB design software packageDesign the circuit
(Schematics editor)Place the components (PCB editor)Route the wires
(Autorouter module)
Examples:EAGLEExpressPCB*
Schematic CapturePin in/outsComponentsInterconnectionsEasily
ReadableHigh-Level Block Diagram*All pictures of schematics and
EAGLE screenshots from http://www.sparkfun.com/tutorials/108 and
http://www.sparkfun.com/tutorials/109
Placement of Components
Rats Nest*
Placement of ComponentsPlace big components first- e.g.
microcontrollerPlace components in separate functional groupsPut a
ground plane under all components
*
Signal Routing Component PlacementSurface mountTop and bottom
planesMinimal routing areaThrough-hole mountedAll components on
same sideReduces routing area on all
planes*http://www.ehow.com/how_8306661_solder-mini-components.htmlhttp://blog.amal.net/?p=188
Signal RoutingTraces are wires connecting componentsTraces can
be routed through multiple layers*
Vias and PadsVias are connections between layersPads are copper
areas for pin connections*
Manufacturing FilesGerber FilesIndustry standard file format to
describe circuitsGenerated by PCB design softwareContains all
necessary info to manufacture a circuit board (Traces, Pads,
Silkscreen, etc.)Drill FilesDescribes the location and size of
holesZipped with Gerber files and sent to manufacturer
*
Viewplot Check*
Cost Estimate*www.pcbfabexpress.com
Cost Estimate*www.sunstone.com
SummaryPCBs allow for portable and reliable circuitsDesigned in
EDA SoftwareDesign the circuitPlace the componentsRoute the
wiresManufacturePrice varies based on size and urgency*
