The chassis is metallic, with a screw hole in the middle, which connects to the ground. Here, a 1M resistor is connected in parallel with a 1nF capacitor to the circuit board ground. What are the benefits of this configuration?In metal chassis devices, the PCB GND (signal ground) is connected to the chassis GND (enclosure … Read more
When disassembling power boards or designing power-related PCBs, we often encounter structures like this: Figure 1: Common slot hole structure on power PCBs Many people think these slot holes are just for aesthetics or mechanical structure needs. In fact, their true function is closely related to electrical safety, and the key lies in one concept—creepage … Read more
Do not think about whether you can succeed, since you have chosen the distance, just focus on the journey through wind and rain; do not think about whether cold winds and rain will come from behind, since the goal is the horizon, all that is left for the world is your silhouette! Keep it up! … Read more
What seems to save space with built-in appliances has led countless families into pitfalls! Are you facing issues with heat dissipation and size discrepancies during your home renovation? While homeowners are enchanted by the fantasy of a “fully integrated” kitchen, hidden dangers are brewing—some have hidden outlets behind the refrigerator, causing the machine to protrude, … Read more
GCC stands for the Gulf Cooperation Council, which was established on May 25, 1981, in Abu Dhabi, UAE. Its member countries include Saudi Arabia, Kuwait, the United Arab Emirates, Qatar, the Sultanate of Oman, the Kingdom of Bahrain, and the Republic of Yemen— a total of 7 countries.The GC mark certification is a market access … Read more
A few days ago, I went to help a friend fix a circuit, only to realize I had forgotten my multimeter at home. My friend looked at me eagerly, his face saying, “Master, please show your skills.” I slapped my forehead and remembered a trick my mentor taught me years ago—using my tongue to measure … Read more
For more exciting content, please click the blue text above to follow me! The previous article “Understanding the Differences Between TN, IT, and TT Low Voltage Distribution Systems: Essential for Electrical Safety (1)” shared some content about the TN system, and today I will continue to share more. The ungrounded neutral point system (IT) is … Read more
For more exciting content, please click the blue text above to follow me! In the book “Power Supply and Safety in Civil Buildings,” three grounding methods for low voltage distribution systems are defined, named as follows: 1) TN System; 2) IT System; 3) TT System; Below, I will share detailed information about each grounding system. … Read more
Considerations for Renovating Old House Circuits It is necessary to replace all copper core wires; partial modifications are not recommended; Old aluminum wires in the walls are prone to oxidation and overheating, posing hidden dangers; Old air switches should be replaced with new ones that have leakage protection; Increase the number of sockets to avoid … Read more
Considerations for Renovating Electrical Circuits in Old Houses It is essential to replace all wiring with copper core wires; partial modifications are not recommended; Old aluminum wires in walls are prone to oxidation and overheating, posing hidden dangers; Old air switches should be replaced with new models with leakage protection; Increase the number of sockets … Read more