Category Archives: Uncategorized

It is easy to form two basic parasitic elements that may cause problems in PCB design: parasitic capacitance and parasitic inductance. When designing a circuit board, placing two tracks close to each other will cause parasitic capacitance. You can do this: place one trace on top of another trace on two different floors; Or on […]

In electronic design, PCB is the physical carrier of our design content, and the final realization of all our design intentions is represented by PCB. Such PCB design is an indispensable link in any project. However, in the previous design, due to the low frequency, low density and large distance between devices, PCB design was […]

The key to realize high-precision deep milling of PCB is that the grating ruler on each axis can sense the board surface, so that the descending depth of each Z axis can be controlled separately, and the axes can work independently in coordination to realize mass production processing. Here, the main influencing factors are analyzed: […]

PCB process failure: debris appears on the hole wall. Reason: (1) the material of cover plate or base plate is inappropriate. (2) The cover plate causes the bit damage. (3) The vacuum pressure of the spring central head of the fixed drill bit is insufficient. (4) The pressure foot gas supply pipeline is blocked. (5) […]

What you must know about ESD as a PCB LAYOUT engineer. TVS tube is widely used in practical PCB design. Silicon transient voltage absorption diode has extremely fast response time (sub-nanosecond level), quite high surge absorption capacity, and many voltage grades. It can be used to protect equipment or circuits from static electricity, transient voltage […]

Numerical control device is the core of the whole numerical control system, and its hardware structure can be divided into big plate structure and functional module structure according to the plug-in mode of PCB in CNC device. (1) CNC device with large plate structure can be composed of main circuit board, position control board, PLC […]

The purpose of this test is to verify the resistance to electrostatic discharge (ESD) caused by the approach or contact of objects or people or devices. Or people’s interior can accumulate electrostatic charges higher than 15kv voltage. Experience shows that many unexplained failures and damages are probably caused by ESD. Through discharging from the ESD […]

Viscosity and surface tension are important properties of solder. Excellent solder should have low viscosity and surface tension when melted. Surface tension is the nature of matter, which cannot be eliminated, but can be changed. The main measures to reduce the surface tension and viscosity in PCBA welding are as follows. ① Increase the temperature. […]

The aluminum substrate is a low-alloy Al-Mg-Si high-plasticity alloy plate, which has good thermal conductivity, electrical insulation and machinability. Compared with the traditional FR-4, the aluminum substrate has the same thickness and the same line width, and can carry higher current. The aluminum substrate has a withstand voltage of 4,500 V and a thermal conductivity […]

Although I am not a professional PCB designer, I would like to share what made in additive process means to PCB designers, especially the relationship with solder resist. Here are some important factors that I think designers need to consider. 1. Definition of solder resist Essentially, any definition provided by EDA tools is incorrect; The […]