Produce Your Own PCB Board Jack Ou Engineering Science Sonoma State University

Add Components

Add NPN 2N3904 (Schematic Symbol) (Package)

Add Resistors A standard ¼-watt resistor is a type 0207.

Add Resistors Vertically

Add a Capacitor

Add a Phoenix Connector

Initiate a Command Two-Step Process Click on a command Click on the component

Move Use the Move button to alter any component’s location

Delete

Generate a Mirror Image (Generate a mirror Image)

Edit a Component’s Value

Making Connections (Use Net command to make connections)

Display Net Name

To Start a New Board File

Board Editor If you keep both windows open, changes made on the schematic window will be reflected in the layout window.

Turn on the Grid

Rearrange the Comopnents (Right-Click to rotate a component) (The smaller the board, the more economical)

Click on Route to Start Wiring Up the Circuit (Left click to select air wire to route)

Routing Menu (Two Metal Layers) (Width of a wire) You should select the width of the wire to be 0.04 inches (40 mils) or greater.

Jumpers You will need to use physical wires as jumpers in places where you can’t route across existing copper trace.

Add Vias – Drill (Assumptions: 1. drill bit is approximately 31 mils in diameter 2. wire size is 29 mils) – Diameter (56 mils)

Provide Connection Via Jumper (Right click to bend the wire by 45 degrees)

A Sample Layout

Display only the necessary Metal Layers

Print Only Necessary Metal Layers (Show Bottom trace, pads, and via)

Print the Layout to a Transparency

Run the transparency through the laser printer twice to produce better transfer

Cut the Transparency

PCB Development With contribution from Kevin Zack

Cut the PCB Board

Clean the PCB with a scotch pad or fine sandpaper

When the board is shiny, use acetone to remove any oil or grease on the board

Transfer Image 1.Run the transparency through the laser printer twice to produce better transfer. 2.Tape the printed transparency on to the a cleaned PCB board. 3.Heat a hobby iron. With light pressure, iron the transparency onto the copper. 4.After the board has cooled, peel off the transparency. 5.Use Sharpie to complete image transfer

Tape the printed transparency on to the a cleaned PCB board

Heat a hobby iron. With light pressure, iron the transparency onto the copper Use highest Setting-- 3

After the board has cooled, peel off the transparency.

Failed Image Transfer

Use Sharpie to Repair PCB Board

Precaution Etching Solution may leave stain on skin and utensils. The use of rubber gloves is recommended. Avoid prolonged or repeated breathing of vapor or contact with skin.

Develop PCB 1.Ferric Chloride is used to remove the copper not protected by the toner. 2.Place the printed board into a container with a lid and pour about ¼” of the acid solution over the board. 3.Secure the lid and using a swirling motion, agitate the solution for 15 minutes to 30 minutes until the unwanted copper is removed. 4.After the excess copper is removed, pour water over the board to halt the etching process. 5. Dispose the left over chemical properly. (Include the chemical rinsed off with water)

Ferric Chloride

Place the printed board into a container with a lid and pour about ¼” of the acid solution over the board

Agitate the solution

Dispose Chemical Properly

Post Processing Clean off the toner protecting the traces with a scotch pad or sandpaper. Clean off any residue with acetone. Drill the board with a drill press. (Use 31 mil drill bit)

Remove Ink (Before) (After)

Drill Holes