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How to improve the problem of no copper holes in multi-layer PCB circuit boards?

How to improve the problem of no copper holes in multi-layer PCB circuit boards?

1. Add high-pressure water washing and gel residue removal process for holes prone to producing dust (such as holes with a diameter of less than 0.3mm and 0.3mm).

2025-03-10

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What are the levels of a PCB printed circuit board, and what are the meanings and functions of each level?

What are the levels of a PCB printed circuit board, and what are the meanings and functions of each level?

The signal layer is mainly used to lay wires on printed circuit boards. Protel99SE provides 32 signal layers, including top, bottom, and 30 intermediate layers.

2025-03-10

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2025

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Common structures of soft hard composite panels

Common structures of soft hard composite panels

Rigid flexible PCB is a new electronic interconnect technology that integrates rigid printed circuit boards (PCBs) and flexible printed circuits (FPCs). It combines the advantages of both, providing more flexible spatial layout capabilities while maintaining the support and stability of electronic components. The following is an overview of the common structures and process flow of soft hard composite boards:

2025-03-10

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2025

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Common power cable technologies! Worth collecting!

Common power cable technologies! Worth collecting!

Answer: According to their usage, they can be divided into bare wire, insulated wire, heat-resistant wire, shielded wire, power cable, control cable, communication cable, RF cable, etc. What are the types of insulated wires?

2025-03-10

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The Development History of Resistors

The Development History of Resistors

Resistors are fundamental components in circuits. After testing the conductivity of various materials and discovering the presence of current, early scientists gradually developed the concept of resistance. Scientists have found that copper, gold, and aluminum are excellent conductors with low resistance, while air, mica, and ceramics are considered resistors because they can greatly restrict the flow of current. Although industry insiders have long known about its resistance performance, it was not until 1961 when Otis Boykin created the first inexpensive and reliable resistor, allowing scientists to accurately control the amount of current transmitted to a component, that the reliable resistor we know today was born. With his breakthrough, the resistance of resistors to extreme temperatures and oscillations greatly decreased, ultimately making low-cost production possible. As the US military, IBM, and numerous consumer electronics manufacturers place orders to purchase Boykin's new resistors, their presence is ubiquitous from household appliances, computers to missiles.

2025-03-10

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2025

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How to choose resistors in circuit design?

How to choose resistors in circuit design?

Resistors are one of the most commonly used components in electronic products, and almost any electronic product will have resistors inside. Resistors can be used as voltage dividers, splitters, and load resistors in circuits; It can form filters and delay circuits together with capacitors; Used as a sampling resistor in power or control circuits; Used as a bias resistor in semiconductor tube circuits to determine the operating point; Use resistors with special properties, such as variable resistors and thermistors, to prevent surge voltage, suppress surge current, and achieve over temperature protection. Resistors are the most common and essential components in circuits. The correct selection and use of resistors are crucial for the stable operation and reliability of products.

2025-03-10

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