Notes for pressing holes 1. The pressing hole can reduce the wave peak welding set by welding this kind of components. It is easy to change parts. 2. New drill bit drilling is generally adopted for pressing hole, because of the high requirement for its precision, our company's conventional pressing hole control tolerance is /-0.05mm, [...]
What is inductance Inductance, or inductance, is a property of a closed circuit that gives rise to an electromotive force to resist a change in the current passing through the closed circuit. This inductance, called self-inductance, is a property of the closed loop itself. If the current in one closed circuit changes and an electromotive [...]
With the rapid progress of technology, the use of PCB boards is becoming more and more widespread, and more and more customers of the line will have such problems: How should the PCB circuit board be maintained? How can I make the life of the circuit board longer? Now share some knowledge of PCB circuit [...]
1: plug hole Standard: The via hole must be plugged; white light is not allowed (green light is allowed), and the ring is processed according to the customer's document. If the ring is covered, part of the hole is allowed to turn yellow, but the ring is not accepted copper. Project documentation requirements 2: cover [...]
Notes on crimping holes 1. The crimping hole can reduce the wave soldering set for soldering such components once. It is very easy to replace parts. Of course, if you change it many times, it will affect the reliability of the hole. 2. The crimping hole is generally drilled with a new drill bit, because [...]
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, [...]