1. Gold sinking for FPC FPC Advantages: not easy to oxidize, can be stored for a long time, the surface is smooth, suitable for welding fine gap pins and components with small solder joints, can be repeated many times over reflow welding will not reduce its weldability. Disadvantages: high cost, poor welding strength, because the [...]
Circuit board wastewater Circuit board production enterprises in the circuit board grinding, etching, electroplating, hole metallization, development, stripping process will produce circuit board wastewater. Circuit board wastewater mainly includes the following: Complexing and chelating copper-containing wastewater produced by chemical copper deposition and etching processes, with a pH value of 9~10 and a concentration of Cu2+ [...]
Trivalent iron ions react with copper in REDOX reaction to form divalent iron ions and copper ions 2FeCl3+Cu=2FeCl2+CuCl2
The electrical energy consumed by electronic devices during work, such as rf power amplifier, FPGA chip and power supply products, is mostly converted into heat emission in addition to useful work. The heat generated by the electronic equipment causes the internal temperature to rise rapidly. If the heat is not released in time, the equipment [...]
1) increase the intensity of the radiation electromagnetic field, as well as the spacing or shielding between components with more active electromagnetic induction. 2) try to avoid thick and cloudy bump voltage equipment, strong and weak signal equipment interwoven together. 3) during planning, the cut of the magnetic field line to the printed wire shall [...]
Double-sided circuit board characteristic The difference between a single-sided circuit board and a double-sided circuit board is the number of copper layers. Double-sided circuit board is both sides of the circuit board with copper, can be connected through the hole. Only one layer of copper on the single side can be used for simple lines, [...]
In view of the circuit board factory inventory management system is not perfect, improve the management system. Circuit board factory first need to establish and improve the post responsibility management system, strengthen the dynamic management of warehouse materials. The main businesses in the circuit board factory inventory procurement process include the submission of requisitions, signing [...]
PCB board is one of the most common electronic components, almost all electronic products will use PCB board! PCB is widely used in electronics, computers, electrical appliances, mechanical equipment and other industries, it is the support body of components, mainly used to connect components to provide electrical, which is the most common and widely used [...]
The copper foil is covered throughout the circuit board and is partly etched off during the manufacturing process. The surface can be seen very small line data is copper foil. What's left is a network of tiny wires called wires, or wiring, that provide the electrical connections for the parts on the circuit board. Usually [...]
The red meter pen is grounded, the pin position in the red ring is the location, and the negative pole of the capacitor is the location. The black meter pen is placed on the IC foot to be measured, then the multimeter will display a diode value, according to the value of the diode to [...]