Zeruns's Blog - English Site
Open Source 24V3A Flyback Power Supply Based on UC3842, with Transformer Parameter Calculation
Electronics / Circuits

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.

Published on 2025-10-13
Disassembly and Circuit Design Analysis of ZGRL-80 Photography Light
Electronics / Circuits

Disassembly and Circuit Design Analysis of ZGRL-80 Photography Light

The article details a teardown of the ZGRL-80 fill light, revealing false advertising: it lacks PD fast charging despite claims, drawing under 10W via Type-C, and its 80W rating is exaggerated with LEDs consuming about 40W. The analysis covers internal circuitry, battery configuration, and thermal imaging, helping readers identify misleading specs and understand budget device limitations.

Published on 2025-07-03
Open-Source USB 10 Gbps Hub with 2.5 Gbps Ethernet & TF/SD Card Reader (VL822+RTL8156BG+GL3224)
Electronics / Circuits

Open-Source USB 10 Gbps Hub with 2.5 Gbps Ethernet & TF/SD Card Reader (VL822+RTL8156BG+GL3224)

An open-source USB-C dock integrates four 10Gbps USB-A ports, 2.5G Ethernet, and TF/SD readers using VL160, VL822, RTL8156BG, GL3224. It accepts 4-20V input, buck-boosts to 5.1V with up to 9.5A, supporting PD fast charging. Tests show USB read/write 969.65/912.65 MB/s, Ethernet 2089/2497 Mbps, card read 93.04 MB/s, efficiency up to 91.79%. Schematics, PCB files, and replication notes are provided.

Published on 2025-04-29
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.

Published on 2025-02-06
EG1151 High-Power Synchronous Buck-Boost Power Module (Supports Type-C PD Fast Charging) Open Source
Electronics / Circuits

EG1151 High-Power Synchronous Buck-Boost Power Module (Supports Type-C PD Fast Charging) Open Source

An open-source high-power adjustable buck-boost DC-DC module based on the EG1151 chip is introduced, using fully domestic components. It supports Type-C PD3.1 up to 48V, XT60, and DC5.5 inputs, up to 63V and 20A, with overcurrent and over-temperature protection. Measured peak efficiency is 96.8%, though sustained current is about 18A. Schematics, PCB files, and 3D-printed enclosure models are provided.

Published on 2025-01-16

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