Principles to be followed when copying circuit boards

PCB copying is to copy the circuit diagram of the PCB circuit board through technical means. It uses reverse research and development technology to reversely analyze the PCB and copy the original product’s PCB files, BOM list files, schematic files and other technical files as well as PCB silk screen Files are restored 1:1.

The purpose of PCB copying is for later development, which includes installing components, in-depth testing, modifying circuits, etc.

PCB copying is a very tedious job. If you are not careful, you will make mistakes, causing the printed circuit board to become unusable. So, what are the principles to be followed when copying circuit boards?

Circuit board copy board

  1. Wire width selection: A line width of 40-100MIL can meet general application requirements. For high-power applications, the line width should be appropriately increased according to the power level. In low-power digital circuits, in order to increase the wiring density, the minimum line width is 10-15MIL.
  2. Line-to-line spacing: When the line spacing is 1.5MM (approximately 60MIL), the insulation resistance between lines is greater than 20M ohms, and the maximum withstand voltage between lines can reach 300V; when the line spacing is 1MM (40MIL), the maximum voltage between lines The withstand voltage is 200V. Therefore, on circuit boards with medium and low voltage (line-to-line voltage not greater than 200V), the line spacing should be 1.0-1.5MM (40-60MIL).
  3. Soldering pad: For a 1/8W resistor, a pad lead diameter of 28MIL is enough; for a 1/2W resistor, the diameter is 32MIL.
  4. Draw the circuit frame: The shortest distance between the frame line and the component pin pad should not be less than 2MM. Generally, 5MM is more reasonable, otherwise it will be difficult to cut the material.
  5. Component layout principles: In PCB design, if the circuit system contains both digital circuits and analog circuits, as well as high-current circuits, they must be laid out separately to minimize the coupling between the systems in the same type of circuit.
  6. The input signal processing unit and output signal driving components should be close to the circuit board, and the input and output signal lines should be as short as possible to reduce input and output interference.
  7. Component placement: can only be arranged in two directions: horizontal and vertical.
  8. Component spacing: For medium-density boards, during wave soldering, the component spacing can be 50-100MIL; for integrated circuit chips, the component spacing is generally 100-150MIL.

In general, it is easy to do a good job in PCB copying. Practice makes perfect, but difficult to say.

If you don’t understand the principles, it is easy to make mistakes, and naturally you will not be able to make high-quality PCB copying. Therefore, you must be careful when doing PCB copying to ensure that everything is foolproof, and do not fail to copy the circuit board due to negligence.

Fumax is a professional manufacturer that provides PCB prototyping, copying, and mass production. If you have any questions about PCB copying, we are always here to answer your questions. We always welcome your calls!

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