I encountered a minor simulation issue while using the Multisim SPICE tool to analyze an oscillator. This is a simple Colpitts oscillator circuit, and the simulation shows that it indeed oscillates. However, I wanted to view the transfer function of the discrete components just to ensure everything is working properly. When I tried to get … Read more
With the rise of healthy eating, the air fryer, which claims to fry chicken nuggets and fries without oil and can also be used for baking with just one button, has become a favorite small appliance for food lovers. A friend bought a second-generation Liven (利仁) air fryer (model LR-KZ880, infrared heating tube, 10 liters … Read more
1 Determine Whether a Circuit or Device is Live The digital AC voltage range is very sensitive, capable of displaying even the smallest induced voltages. Based on this characteristic, it can be used as a test pen. The method is as follows: set the multimeter to AC20V, keep the black probe unconnected, and touch the … Read more
A certain audio product’s PCBA (wave soldering process) experienced burning during use. The failure rate was high when using Flux A, slightly decreased after cleaning, and dropped to zero after switching to Flux B. This article will explore the failure reasons through a series of professional testing and analysis methods. 1. Visual Analysis From visual … Read more
In the process of developing and producing electronic products, one may encounter the scenario of needing to disassemble an existing PCB circuit board to analyze the circuit layout, component selection, and signal routing. Below, we will discuss an efficient process for disassembling a PCB circuit board, which we hope will be helpful to everyone. 1. … Read more
▼ Follow WeChat public account: Engineer Looks at the Sea ▼ Hello everyone, I am Engineer Looks at the Sea, original articles are welcome to like and share! Analyzing, locating, and repairing circuits is a basic task for hardware engineers. Various strange problems always arise on-site, and we need to gradually locate and solve these … Read more
Hello everyone, I am a beginner in electronics. Today we will analyze an AC 220V to DC 5V resistive-capacitive voltage reduction circuit. The resistive-capacitive voltage reduction is a circuit that can convert AC mains power to low DC voltage with very few components and at a very low cost. It is often used in devices … Read more
We Are Together Due to the impact of the pandemic, how to conduct practical teaching, which is crucial for science and engineering courses, online has become the biggest difficulty in online teaching. Teacher Yu Xiaoming from the School of Information Engineering has conducted a new exploration. In the online teaching of the “Circuit Analysis” experimental … Read more
1. Identifying the Start and End of Motor Windings Using a Multimeter When the six terminals of a three-phase asynchronous motor are lost, unclear, or rewound, it is necessary to determine which two terminals belong to the same phase, which is the start of the coil, and which is the end. Below are several methods … Read more
Introduction For beginners in electronic technology, mastering basic circuit principles, the functions and characteristics of components, how to analyze circuit diagrams, reading PCBs, soldering techniques, and common troubleshooting methods are all essential skills that need to be well understood. This article discusses how to read PCBs, hoping to assist beginners. PCB stands for printed circuit … Read more