1. Gerber file preprocessing The wiring and functional characteristics on the FPC are designed by the customer, and the circuit board factory is only responsible for manufacturing it. The circuit board factory often finds that the design information sent by the customer does not meet the board's process capabilities, such as line width, line The [...]
Maybe you just completed the etching of the circuit board in the project and everything looks very successful. But you also know that over time, the copper traces on the circuit board will slowly turn black and green. This article describes a simple method for tinning copper traces on a circuit board. If you have [...]
Production method 1: 1. Cut the copper plate into the required dimensions of the circuit diagram. 2. Place the wax paper on the steel plate, use the pen to engrave the circuit diagram on the wax paper in 1:1, and cut the circuit diagram engraved on the wax paper according to the board size. The [...]
The board we first saw was called the substrate. Simply speaking, it is an insulating material, bakelite, and plastic are all possible. A piece of copper foil is then applied to the substrate. The curved line we saw above is copper foil. Find a circuit board and you can see it with a knife. But [...]
The reaction principle can be expressed by the equation of reaction of FeCl3 solution with metallic Cu: 2FeCl3 + Cu == 2FeCl2 + CuCl2; Although iron is more active than copper, it can replace metallic copper from copper sulfate solution, and it produces ferrous sulfate itself. However, ferric iron has stronger oxidation than divalent copper, [...]
Common mode Choke, also known as common mode choke. Performance characteristics: It has extremely high initial magnetic permeability, has large impedance and insertion loss under the earth's magnetic field, and has excellent suppression effect on interference, and exhibits resonance-free insertion loss characteristics in a wide frequency range. l High initial permeability: 5-20 times that of [...]
Circuit board maintenance is actually an experience. You want to quickly find fault points from dense components. Not only do you need extensive maintenance experience, but you also need to know the working principle of the board. The following small series are based on your own knowledge. Method Try to talk about how to quickly [...]
According to China's central radio and television voice "News Night" report, the three major operators will announce how much their 5G packages will be released on October 31st in November 1 5G commercial packaging officially opened 5G next week! Are you ready to change your phone and 5G 5G package? I have seen that the [...]
The electronic equipment must be interconnected according to the circuit schematic diagram to achieve the predetermined function. If the connection is wrong, the whole circuit board will be invalid. Therefore, the connection with the best compatibility of reliability, process and economy is an important part of the circuit board design. One. There are many ways [...]
Hole metallization process of circuit board The hole metallization process is one of the most critical processes in the manufacture of printed circuit boards. For this reason, it is necessary to carefully check the copper surface of the substrate and the state of the inner surface of the hole. (1) Inspection project 1. Is the [...]