Author Archives: allaismt

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 […]

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) […]

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. […]

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 […]

With the rapid development of electronic information technology, the manufacturing requirements of various circuit boards have increased greatly. As the key raw material of anodizing in electroplating process, the demand of copper is greatly increased, and the high-precision PCB must be anodized with phosphor copper balls. Phosphor copper balls are mainly used in electronic devices […]

Today, from the perspective of soldering, let’s talk about what points should be paid attention to when designing PCB. 1. Factors affecting PCB welding quality From PCB design to the completion of all components welding, to become a high-quality circuit board requires the control of PCB engineers, welding process, welding workers and many other links. […]

Generally, the design current of PCB will not exceed 10A or even 5A. Especially in household and consumer electronics, the continuous working current on PCB usually does not exceed 2A. Recently, however, the company’s products should be designed with a power line, and the continuous current can reach about 80A. Considering the instantaneous current and […]

Matters needing attention in the design of the clock on the circuit board are mainly considered from three aspects. 1. PCB layout 1) the clock crystal and related circuits should be arranged in the center of the PCB with a good stratum, not near the I/O interface. The clock generation circuit can not be made […]