Open-Source 140W+65W Buck-Boost PD3.1 Fast-Charging Module (2C+1A Ports), IP6557+IP6538,

Open-sourcing a 205W buck-boost fast-charging module (140W+65W) based on the IP6557 and IP6538 chips. One Type-C port supports the PD3.1 protocol, wit

A Simple Unboxing and Review of EastTester(中创) ET4410 Desktop Digital LCR Meter

The article reviews the EastTester ET4410 LCR meter, purchased for 1,199 yuan. It outlines key specifications, including 10Hz-100kHz frequency, 0.2% basic accuracy, DCR and electrolytic capacitor modes, TFT display, and calibration functions. Practical tests show accurate measurements for resistors, capacitors, and inductors, though low-resistance readings are limited. A list sweep mode bug is identified, with a firmware update provided. Readers gain cost-performance insights, usage guidance, and awareness of measurement limitations when choosing this instrument.

Synchronous Rectification Buck-Boost Digital Power Supply Based on STM32

This article presents an open-source four-switch Buck-Boost digital power supply based on STM32G474, supporting Type-C PD and DC input up to 48V10A and 450W. It includes schematic, PCB, firmware, and 3D model files. The design offers adjustable output, OLED display, protections, and host monitoring, achieving up to 94.3% efficiency and low ripple. Users can access calculations and source code.