In this instructable, I will show you how to make dual layer PCB. I'm using this method for etching of the dual layer circuit boards at home.
What things you will need:
Copper - clad board
Ferric Chloride (FeCl3)
Acetone (Nail polish remover)
- Glossy Paper
- LASER Printer
- Marker Pen
- Saw - For copper board cutting
Let's Do it...
Step 1: Designing of the Circuit
Step 2: Designing of the PCB Layout
After designing of the schematic diagram, Now start designing of PCB Layout in the Eagle EDA tool (PCB Design Software). After that Take print out of PCB Layout on glossy paper.
Note: Use Only LASER printer only.
Remember, Before top layer printing. You need to mirror image of the top layer layout. otherwise, The circuit will be inverted..
Note: Scale Factor set to 1.
Step 3: Cutting of Copper Board
Cut the copper board according PCB layout size. After cutting the paper, put this top layout on the top side of the PCB. Now put bottom layout paper on the bottom side of the PCB.Use adhesive tape to stick the paper on copper board.
Step 4: Toner Transfer Method
Use an iron to transfer the toner on the glossy paper to the PCB.Make sure your copper board is as clean as possible. Now start ironing on top side of copper board. After 2 to 5 minutes start ironing on bottom side of copper board (Approximate 2 to 5 Minutes).
For the toner transfer method, required temperature is 210 C (410 F). So set the iron temperature to its maximum value. After ironing, Now start peeling off the paper with tap water.
Step 5: Etching Process
Before you start etching, check all the tracks. If any track broken, use permanent marker pen to draw a track with carefully. Use ferric chloride (FeCl3) as etchant. Get you ferric chloride(FeCl3) powder and mix with water in your plastic container.Now start to etching of PCB.
After etching process, use the acetone to clean it.
Step 6: Drilling Process & Soldering Process
After cleaning of PCB. Now start drilling of copper board. After Drilling, Start soldering process.
Step 7: Testing
After soldering, Start testing the circuit.