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Blank PCB,also known as bare PCB or empty PCB,is an electronic board made by laminating epoxy glass fiber,copper foil,and PCB ink.It is an empty circuit board without any components installed to create a functional circuit board.Blank PCB boards are sometimes referred to as "copper clad" circuit boards because there is a layer of copper coating around the circuit board.
Blank PCB boards have a non-conductive prepreg or polymer layer and solder film between the substrate,copper wire,and copper wire.Copper wires in different layers are connected by copper filled holes.They are used to build custom passive filter circuits. They are designed to be installed in electronic component casings to provide a layout with three holes in one group, or PCBs with multiple sets of series components. Each group of components has five sizes and parallel wound components.
Types of blank printed circuit boards
1.FR-4
The FR4 PCB is the most common blank PCB. FR4 is not a material, but represents level 4 flame retardancy.FR4 PCB is actually an epoxy glass fiber PCB with a fourth level flame retardant rating. The pre impregnated layer between the copper layers is also epoxy glass fiber, but it is semi cured.
FR4 blank PCBs are easy to manufacture, and FR4 PCBs are cheaper than other PCBs with the same number of layers and circuit complexity.
2.Metal core PCB
Metal core PCBs include aluminum core PCBs and copper core PCBs. Metal PCB substrates have much better thermal conductivity than FR4 cores, and metal core PCBs are mainly used for LED lighting and other power applications.
3.Rigid-Flex PCB
Flexible PCBs and rigid-flex PCBs are PI or PET-based empty PCBs that can bend. Rigid-flex PCBs are special flexible PCBs because their flex section is laminated with FR4 PCB layers.
4.High Frequency PCB
A high-frequency PCB is also a high-speed and RF microwave PCB. It is a PTFE-based blank PCB that transmits and receives high-frequency signals. High-frequency PCBs can be used for antennas, radars, anti-collision systems, GPS, smartphones, missile systems, etc.
Why Bare Board Testing?
There are many reasons for testing bare boards.Failure of the PCB as a circuit board frame after installation can lead to many problems and although uncommon,the bare PCB may already have defects before components are added.Some of the more common problems are over-etching, under-etching and holes. Even small defects can lead to manufacturing failures. The increasing demand for multilayer PCB boards due to increased component density makes bare board testing even more important. After assembling a multilayer PCB, it is virtually impossible to repair it in the event of a failure. If the bare PCB is the skeleton of the board, the components are the organs and muscles. Components can be very expensive and are often critical, so having a solid frame prevents wasting high-end components in the long run.
How to make a empty PCB?
When designing PCB wiring, the following principles should be followed: separating analog signals from clock signals, maintaining a line angle greater than 135 °, maintaining the same line width in the same network, and keeping the line as short as possible.
When completing PCB design, it is necessary to ensure that the PCB has uniform impedance, low electromagnetic interference, and manufacturability.
What are the advantages of a bare PCB?Firstly, it enables designers to test circuits and try out new ideas at a very low cost, and once the circuit is correct, the circuit is then transferred to a finished board for soldering and assembly. Secondly, bare PCBs can be used to make your own when a public PCB cannot meet your design needs, which is why DIY electronics enthusiasts widely use bare PCBs.
Of course, there are some disadvantages of using bare PCBs. First of all, even good designers are difficult to ensure the overall quality and stability of the bare board design, so detailed testing and inspection is required. Secondly, for small production and personal use, using bare PCBs may be more cost effective, but for mass production, the cost of making bare boards becomes higher.
As the cornerstone of circuit design, the diversity and flexibility of the blank PCB board provides a solid foundation for electronic product innovation and is an integral part of modern electronics manufacturing.
