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
  • Scissors

  • Adhesive tape

  • Plastic container

  • Sand paper

  • Safety gloves

  • Saw - For copper board cutting

Let's Do it...

Step 1: Designing of the Circuit

Design schematic diagram in EDA tool (PCB Design Software).

List of EDA Tools (PCB Design Software):

You can select any one of them.

I prefer EAGLE PCB Design Software.

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.

Job Done!

Check my video..

<p>At around 3:38, what is the fan you are using to blow drilled materials?</p><p>I found a discussion over here: <a href="https://www.muffwiggler.com/forum/viewtopic.php?t=150985&sid=65a34e7ee14f15f0674ba131a755060a" rel="nofollow">https://www.muffwiggler.com/forum/viewtopic.php?t=...</a></p><p>is it better to use drilling oil? What have you found to work best?</p>
<p>I didn't find ATTiny85 in Eagle PCB software..</p><p>Could someone help me..?</p>
<p>Hi,</p><p>Please Download ATTiny85 library for Eagle PCB Software.</p><p>Click Following link..</p><p><a href="http://www.diymodules.org/download/eagle-libs/usr/0000002786/hhn_attiny25_45_85_r500.zip">ATTiny85<br></a></p><p>After downloading the <strong>.zip</strong> file, unzip that file. Now copy <strong>.lbr</strong> file to <strong>lbr</strong> folder. This <strong>lbr</strong> folder located in Eagle PCB software installed directory.<strong> </strong><br></p><p>If you want download more library for Eagle PCB Software, Go to this web page..</p><p><a href="http://www.diymodules.org/">DIYmodules.org<br></a></p><p>Thank You.<br></p>
Instead of using LASER printer , can I use any other alternative....?<br>I didn't find LASER printer nearer to me..!<br>Please reply to me asap...!<br><br>I am a beginner in building PCBs...
<p>This toner transfer method only works with LASER printer. This method won't work with Inkjet printers. You can use copier machine for this method. You can find this copier machine at copier shop.</p><p>Find a copier shop nearer to you. Take a print out on glossy paper and follow the above steps.</p><p>List of copier machines:<br>1. xerox copier machine<br>2. canon copier machine<br>3. HP copier machine<br>4. Konica Minolta copier machine</p><p>For better result Go for the<strong> Konica Minolta (KM)</strong> copier machine (If available).<br><br>Remember two things for the copier machine,<br>1. Set the darkness to maximum value for better result.<br>2. Scale factor set to 1 for copier machine.</p>
<p>I've built tons of PC boards. And for the most part I do the same techniques as well. However, I use a product called P-N-P Blue. It is put out by Teckniks. It stands for Press-aNd-Peel Blue transfer film. I have tried ever type transfer that there is and the PNP Blue is by far the best I ever used. It isn't very costly and does work better then gloss paper. You posted a nice project. Thumbs Up!</p>
<p>Thank You.</p>
<p>It looks great :)</p>
<p>Thank You.</p>
<p>I have used the P-N-P Blue as well and it works well. I have stopped using ferric chloride as my etchant. Too much trouble in trying to dispose of and messy as well. I now use one part muriatic acid to two parts 3% hydrogen-peroxide. Disposal is easy just flush the used mixture down the toilet. Muriatic acid is often used as a drain cleaner anyway. </p>

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