produce your own pcb board jack ou engineering science sonoma state university
DESCRIPTION
Produce Your Own PCB Board Jack Ou Engineering Science Sonoma State University. Four-Bit Adder- Subtractor. (4 bit ripple adder). A Four-Bit Adder/ Subtractor on Breadboard. Problem: too many wires!. Add Components. AND. Schematic. Tips. Double click to terminate a wire. - PowerPoint PPT PresentationTRANSCRIPT
Add Power and Gnd of Each IC Chip to the schematic
1. Right click on a part(74LS08N in this example)
2. Click on Invoke
Board Editor
If you keep both windows open, changes made on the schematic windowwill be reflected in the layout window.
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 selectair wire to route)
Double clickTo remove wire
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.
Add angel to the wiring
Header Termination
Terminate the traces going to the header at the bottom metal layer
Reason: this is where the IC will besoldered.
Header terminates at the top metal layer—not a good practice
How to Change Metal Layer
Step 3: Route wire. Start routing at the top metal level.Step 4: Click once to place the wire in an empty area.Step 5: Switch to the bottom layerStep 6: Make contact with the pad at the bottom layer
Jumpers• You will need to use physical wires as
jumpers in places where you can’t route across existing copper trace.
Add Vias
• Add Vias – Drill 0.03149 (Assumptions: 1. drill bit is
approximately 31 mils in diameter 2. wire size is 29 mils)
– Diameter 0.056 (56 mils)
Run the transparency through the laser printer twice to produce better transfer
Practice with regularpaper before you use transparency.
Look at your layout on paperand see if it will work at all.
General Procedure 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
Details Instruction for Double Sided PCB
• Line up the bottom layer with the top layer (with the ink side facing the PCB)
Heat a hobby iron. With light pressure, iron the transparency onto the copper
Use highestSetting-- 3
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)
Place the printed board into a container with a lid and pour about ¼” of the acid solution over the board
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)