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.

GEIL DDR5 5600MHz 32GB Laptop Memory Module Simple Unboxing & Review

The article reviews GEIL Millennium DDR5 5600MHz 64GB laptop memory, a SO-DIMM kit with CL46 timing and 1.1V voltage. It uses CXMT DRAM chips from 2025. AIDA64 benchmarks show read speed 79GB/s, write 81GB/s, and latency 112.7ns. Purchased for 1158 RMB, it serves as a straightforward laptop RAM upgrade option.

MECHREVO Code10 AI Laptop (Ultra7-255H) – Unboxing, Review, and Teardown

Review of MECHREVO Code10 AI laptop (Ultra7-255H, 32GB) covering unboxing, benchmarks, and teardown. It delivers solid performance: CPU-Z single 833.9/multi 10223.9, Cinebench R23 21378, SSD read 4598 MB/s. The 15.3-inch 120Hz display has good color accuracy after calibration; keyboard and speakers are improved, but the laptop is heavier and the camera is poor. Includes 99.9Wh battery, dual M.2 slots, 140W GaN charger, and Thunderbolt 4. Preinstalled CodeGeeX AI assistant could not run due to memory allocation. Value reduced by absence of Guangdong subsidy.

Sharing a website traffic data analytics platform - UStat

UStat is a free, user-friendly website analytics platform offering comprehensive traffic data: PV, UV, IP, bounce rate, visit duration, trend analysis, source and visitor details, search engine/spider statistics, and page heatmaps. Webmasters can integrate it by adding their site and pasting the provided code before the closing head tag.