Monthly Archives: November 2017

Do you know the meaning of the letters on the board? Rx is the resistance, there are a lot of resistance in the circuit diagram, numbered R1, R2... Cx is the no polarity capacitor, the power input terminal, the anti-interference capacitor; IC integrated circuit module; Ux is the IC [...]

From the perspective of disciplines Electricity, electronics and electrical appliances belong to electrical engineering. The term "electrical engineering" comes from Japan, in which the "gas" comes from the Western foreign language translation (the beginning of Western industry, power machinery driven by the steam turbine, and later with the power, [...]

With the development of technology, technology requirements, more and more circuit boards are now used surface mount components, compared with the traditional package, it can reduce the area of ​​the circuit board, easy to bulk processing, wiring density. Chip resistors and capacitors lead inductance greatly reduced, in the high-frequency [...]

First, the copper profile： Copper foil: A cathodic electrolytic material, a thin, continuous metal foil deposited on the base layer of a circuit board, which serves as a conductor for PCBs. It is easy to adhere to the insulation layer, to accept the protective layer of printing, corrosion after [...]

(1) TTL level interface: This interface type is basically a commonplace, from the university to learn analog circuits, digital circuits began, for the general circuit design, TTL level interface basically can not get off! Its speed is generally limited to within 30MHz, which is due to BJT input of [...]

Printed circuit boards are the most important part of electronic equipment. With the popularity of electronic technology and the development of integrated circuit technology, a variety of electromagnetic interference problems have emerged, due to electromagnetic interference caused by economic losses are also increasing. Therefore, electromagnetic compatibility is more and [...]

First, PCB surface treatment: anti-oxidation, spray tin, lead-free spray tin, immersion gold, Shen tin, Shen silver, hard gold plating, the whole board gold, gold finger, nickel palladium OSP: cost less, Good, harsh storage conditions, time is short, environmentally friendly technology, welding is good, smooth.   Spray tin: spray tin [...]

Different resin systems and material substrates, different resin systems, will lead to the effect of copper and copper when the activation of the difference between the significant difference. Especially some of the CEM composite substrate and high-frequency silver substrate specificity, in the chemical treatment of copper, the need [...]

Wearable device PCB design Due to its small size and size, there are few printed circuit board standards for the growing wearable networking market. Before these standards came out, we had to rely on the knowledge and manufacturing experience we had in the development of the board level, [...]

Circuit board plate blister is actually a bad board adhesion problem, and then extended is the surface quality of the board, which contains two aspects: Board cleanliness problem; Surface roughness (or surface energy) problem. All boards on the board surface foam problems can be summarized as the above [...]