Tutorial for Designing Active Tone Control Circuits

Tone control or active equalizer circuits, especially those based on bass, treble, and MID controls, are important circuits in audio amplifier design. Typically, a three-stage active equalizer filter requires three controls for bass, treble, and MID. The bass control allows low frequencies to pass but blocks high frequencies, the treble control allows high frequencies to […]

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Cadence technique mixed signal PCB for EMC zoning and layout design

Key points of this article In mixed signal PCB, analog and digital signals need to be physically isolated. This process is called zoning. It is helpful to reduce crosstalk and interference by partitioning mixed signal PCB and designing layout reasonably. The basic rules for electromagnetic compatibility of mixed signal PCB are: Make the current path […]

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Six skills of PCB design

1. What is the relationship between the line width and the size of the via on the PCB and the current? Generally, the thickness of copper foil of PCB is 1 ounce. If it is about 1.4mil, the maximum current allowed for the width of roughly 1mil is 1a. The via is relatively complex, which […]

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What problems should be paid attention to in PCB etching process?

PCB # outer layer etching A large number of quality problems related to the etched surface are concentrated in the etched part of the upper plate surface, and these problems come from the influence of colloidal structures produced by the etchant. It is very important to understand this, because colloidal hardeners accumulate on the copper […]

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Simulation analysis of EMC / EMI in PCB design

Due to the increasing density of electronic devices on PCB, narrower and narrower wiring, higher and higher wiring density and higher signal frequency, the problems of EMC (electromagnetic compatibility) and EMI (electromagnetic interference) will inevitably be introduced. Therefore, the analysis and application of electromagnetic compatibility of electronic products are very important. However, the general situation […]

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Seven common problems and solutions based on PCB design

1. What is the relationship between the line width and the size of the via on the PCB and the current? Generally, the thickness of copper foil of PCB is 1 ounce. If it is about 1.4mil, the maximum current allowed for the width of roughly 1mil is 1a. The via is relatively complex, which […]

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Summary and sharing of PCB design software kicad and Eagle

The most important link in the PCB design process is “making library” – making the “library” of these components according to the data manual of the components you want to use – schematic symbol library, PCB packaging Library (3D model is becoming more and more important), component information description. Making a correct library is very […]

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Workflow analysis of kicad

The core functions and processes of all PCB design tool software are very close. Therefore, if you are familiar with the use of a PCB design tool through a complete project design, you should easily switch to other tools. For example, if a beginner learns to design a 4-layer board with kicad, it should be […]

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Introduction to FPC connector of flexible circuit board

The flexible printed circuit connector on the market is abbreviated as FPC connector. They have the characteristics of high cable density, portability and thin, so they are called soft circuit board, soft printed circuit board or flexible circuit board. Most FPC connectors are made of polyimide (PI) or polyester film (PET), which improves the reliability […]

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