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WITRN W96Pro Portable Fan Review and Teardown Analysis
Reviews & Teardown

WITRN W96Pro Portable Fan Review and Teardown Analysis

The teardown and review of the WITRN W96Pro Bluetooth fan analyzes its circuitry, components, and performance. Key findings: high-quality parts with generous margins, 18W bidirectional USB-C fast charging, a 4800mAh 21700 cell, sinusoidal-drive BLDC motor, and a feature-rich companion app. Measured runtime is about 8 hours at 35% speed. A fast-charge output bug was resolved by switching the Type-C role to DRP in expert mode.

发布于 2026-08-27
WCH CH224K Fast-Charging Protocol Chip: Function Changed but Model Number Remains Unchanged?
Electronics / Circuits

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.

发布于 2025-09-27
Open-Source Smart Electronic Load Based on CH32V307, Embedded Competition Project Open Source
Electronics / Circuits

Open-Source Smart Electronic Load Based on CH32V307, Embedded Competition Project Open Source

An open-source smart electronic load based on the CH32V307VCT6 microcontroller is presented, developed as a national second-prize entry in the 2023 embedded design competition. It supports constant current, voltage, resistance, and power modes, with 100V/10A/200W ratings. Schematics, PCB files, source code, and reports are freely available for learning and reference.

发布于 2025-02-06

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