As a PCB design engineer, it is necessary to have certain high-speed knowledge. In terms of signals, high-speed signals usually appear in various parallel buses and serial buses. Only when we know what is the bus can we know its running speed and start wiring. bus A bus is a shared physical path for communication [...]
This structure is suitable for such high-power occasions. In fact, I have been exposed to this topology since I studied the design of switching power supplies. I have made several high-power power supplies using this structure. The performance is excellent. This kind of structure has a special liking, that is, the structure is simple and [...]
Superconductors are also called superconducting materials. It generally refers to a conductor whose resistance is zero at a certain temperature. In the experiment, if the measured value of the conductor resistance is lower than 10 to the -25th power Ω, the resistance can be regarded as zero. Superconductors not only have the characteristics of zero [...]
Today, with the rapid development of science and technology, the replacement of electronic products is getting faster and faster, and the technology of LED lights is also constantly developing, which is colorfully decorated for our cities. LED devices account for about 40% to 70% of the cost of LED display screens, and the significant reduction [...]
After continuous development of the optical lens industry, a complete industrial chain has been formed. The optical lens is at the core of the optical component industry chain. The industrial chain includes upstream optical lens raw materials (optical glass, optical plastics). The midstream optical components are mainly the manufacture of optical components such as spherical [...]
Today we will study the different effects of capacitors on direct current and alternating current. The two circuits, the small bulb and the capacitor are exactly the same, and the effective value of the DC voltage and the AC voltage are equal. When the switch is closed, the small light bulb in the DC circuit [...]
circuit board welding defects: 1. The weldability of circuit board holes affects the welding quality Circuit board hole weldability is not good, will produce virtual welding defects, affect the parameters of components in the circuit, lead to the multi-layer board components and inner line conduction instability, cause the whole circuit function failure. The so-called weldability [...]
There are many common welding defects on circuit boards, as shown in the figure below. The following is a detailed description of the common welding defects, appearance characteristics, hazards and causes. A, virtual welding 1. Appearance characteristics There is a clear black boundary between solder and component leads or copper foil, solder to the boundary [...]
After wave soldering and lead wave soldering, the defective circuit board pinhole and porosity are different, from the appearance, the diameter of the pinhole is small, now on the surface, you can see the bottom. Pinhole and the porosity represents in the solder joints have bubbles, but has not yet been expanding surface, most have [...]
Touch dimming circuit board is a touch switch, touch adjustment LED light size touch dimming circuit board solution. The induction mode of this circuit is light touch switch, there are two LED lights, light touch the first light for 1 light cold light, light touch the second light for 2 light warm light, touch the [...]