First of all, use circuit design software such as protel to draw the circuit schematic diagram and PCB (component packaging diagram) on the computer. As shown below:

2. Put the thermal transfer paper into an ordinary printer, adjust the appropriate printing ratio, and print out a black and white PCB diagram. As shown below:

3. Use sandpaper to polish off the oxide layer on the surface of the copper-clad board to make the copper-clad board look smooth and bright. As shown below:

4. Fix the heat transfer paper with the PCB diagram printed in step 2 on the polished copper-clad board in step 3, and feed it into the heat transfer machine (you can also use a common (Heating iron, etc. instead of heat transfer machine) printing, so that the toner containing the PCB pattern is printed on the copper-clad board through hot pressing, and the heat transfer paper is gradually torn off, as shown below:

5 .Pour the corrosive liquid into the plastic box, and then put the copper-clad board printed with the PCB pattern in step 4 into the corrosive liquid. After a period of corrosion (the length of time will vary depending on the concentration of the corrosive liquid), it will take about half an hour. After about an hour, pour out the corrosive solution and fish out the corroded copper-clad board.

Use sandpaper to gently polish off the toner on the PCB pattern on the copper-clad board, and you will get a pattern that is exactly the same as the PCB pattern. The copper circuit wiring is as shown below.

6. Put the copper-clad board obtained in step 5 into the drilling machine and drill holes one by one according to the positions of all holes in the PCB diagram. Finally, the components can be welded accordingly, and the entire PCB plate making process is complete. That's the end. As shown below.