Hiking Trip to Bijia Mountain in Shenzhen: Shenzhen Sunset & Night View Photos

The post shares photos from a hike at Bijia Mountain Park on October 25, 2025. The park is only about 100 meters high and has two main peaks, Biguan and Bijun, each equipped with observation decks offering views of the sunset and urban nightscape. The images were taken with a Huawei Mate 70 Pro+ and compressed to WebP format. The article also links to the author's other travel photo essays and tech-related posts for further reading.

BenQ RD280U Review: 28" 4K 3:2 Professional Programming Monitor

The BenQ RD280U is a 28.2-inch 4K programming monitor with a 3:2 aspect ratio, showing about 20% more lines than typical 16:9 displays. It offers dedicated coding modes, KVM switching, 90W USB-C power delivery, and MST daisy-chaining. Hardware low blue light and MoonHalo ambient lighting aim to reduce eye strain. Measured sRGB coverage was 96.2% with average Delta E 2.23, though blue accuracy is limited. The monitor is well-suited for programmers wanting multitasking efficiency, multi-device control, and long-session comfort.

DJI Mini 2 Drone Teardown Analysis

这篇摘要总结了作者对使用四年的DJI Mini 2无人机进行拆解和问题分析的全过程，字数控制在200字以内。 --- 一篇关于大疆Mini 2无人机的拆解分析文章。作者因无人机5.8GHz图传信号变弱，在过保后决定自行拆机维修。文章详细记录了拆解步骤，并对关键芯片进行了技术分析：主控采用NXP的i.MX RT1064处理器；图像处理由安霸Ambarella H22芯片负责；图传系统核心为DJI定制的S1系列芯片，并由QPF4205和QPF4550分别放大2.4GHz和5.8GHz信号（怀疑故障源于后者）；此外，还解析了电机驱动、电源管理及ToF测距等模块的芯片配置与功能。此次拆解旨在排查并更换故障的5.8G功放芯片，修复图传问题。

Open Source 24V3A Flyback Power Supply Based on UC3842, with Transformer Parameter Calculation

An open-source 24V 3A flyback switching power supply design for 85–265VAC input, achieving 87.4% peak efficiency. Based on UC3842 with synchronous rectification, it provides schematics, PCB files, transformer calculations and specifications, and PSIM simulation models. Test data shows 83–87% efficiency, 1.81W no-load consumption, and ripple around 560–730mV. Full-load thermal performance requires heatsinking.

Flyback Power Supply Design: Parameter Calculation, Component Selection & Transformer Winding Guide

This article presents a complete design procedure for a 72W flyback switching power supply (24V/3A) with universal 85-265VAC input. It provides step-by-step calculations for rectifier bridge, input filter, transformer magnetizing inductance and turns, wire selection with skin effect, MOSFET and output diode ratings, output capacitor, and RCD snubber. Key trade-offs such as frequency vs. efficiency, flux density selection, and core AP value are explained. The article also details practical transformer winding, including air gap adjustment and leakage inductance measurement, enabling readers to replicate the design.

Minecraft Modpack [Mori Garden] Multiplayer Server Setup Tutorial — Hosting MC Server on Linux

This guide explains how to host a Minecraft Mori Garden modpack multiplayer server on Linux using MCSManager 10 and Docker. It covers downloading the client and server packages, selecting a high-performance VPS with at least 4 cores and 8 GB RAM, installing MCSM and Docker, creating an OpenJDK 17 image, importing the server archive, enabling Docker containerization, and editing server.properties. Mori Garden is a peaceful farming-themed Forge 1.20.1 modpack. Readers learn to start the server, connect using IP and port, and grant OP privileges, enabling a relaxing rural Minecraft experience with friends.

WCH CH224K Fast-Charging Protocol Chip: Function Changed but Model Number Remains Unchanged?

WCH’s CH224K datasheet revision (V1F to V2.1) removed single-resistor voltage configuration, disallowing floating CFG pins for 20V requests. This silently breaks existing designs relying on that method. WCH now recommends CH224A, which supports single-resistor mode but requires a 120kΩ resistor for 20V, complicating direct replacement without extra pads. The article questions whether such functional changes warrant a new model number.

Travel Log and Photo Sharing from Nan'ao Island!

The author recounts a post-typhoon weekend road trip to Nan'ao Island with college roommates. Clear skies after rain created ideal photography conditions, and sparse crowds kept traffic light on the usually congested two-lane bridge. Highlights include the Tropic of Cancer landmark, Haiquan Bay, and the scenic coastal ring road. However, driving in Shantou demanded extreme caution due to unpredictable e-bikes. All photos were taken using a DJI Pocket 3 and a Huawei Mate70 Pro+.

GL-RM1PE Unboxing, Review, and Teardown: Enabling BMC Remote Management on a Regular PC

The GL-RM1PE is a PoE-enabled IP-KVM device providing remote BIOS-level control, 4K@30 video, low latency, two-way audio, file transfer, and ISO mounting for OS installation. It features 32GB eMMC and works with the FGB-01 Finger Robot, a Bluetooth button emulator for remote power control. The teardown reveals Rockchip RV1126, KIOXIA eMMC, and Nordic nRF54L15 internals.

Magnetic Components/Magnetic Core Materials & Structures: Analysis, Comparison & Selection Guide

This article provides a systematic guide to magnetic core selection for power electronics, covering key parameters (permeability, saturation, core loss, Curie temperature), comparing materials like ferrite, sendust, permalloy, amorphous and nanocrystalline alloys, and reviewing core structures (EE, PQ, toroidal). It offers engineering recommendations for AC/DC, DC/DC, PFC, and inverter applications, emphasizing frequency matching, loss control, and cost balance. Engineers gain practical reference for choosing cores.