Hey guys! Want to check out my new toy? :)
Here’s the story. I came across this machine at a scrapyard. It was in pretty rough shape, with a damaged casing and an absolutely terrible exterior condition. I picked it up and took a closer look. The internal circuit boards seemed to be…
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72W Isolated DC-DC Converter for AGV Applications: 38–75V Wide Input, ±12V Output and Planar Transformer Design
Quick Start Guide The board interface consists of a 3-pin input connector and a 4-pin output connector. Pin assignments and functional descriptions are provided below. Input Connector (Pins 1–3) Pin No. Signal Name Description 1 IN− Negative input / DC…
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TPS40192 Smartphone Battery Bypass Power Supply Board: 12 V to 4.15 V
Quick Start Guide Board Interface Definitions No. Interface / Indicator Description 1 4.15 V Output Indicator LED indicator for the 4.15 V output. 2 12 V Input Indicator LED indicator for the 12 V input power. 3 DC 5521 Power Input (12 V) DC 5.5 × 2.1 mm…
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8Gen2BOX-DCDCMOD-PCBA
The PCBs Have Arrived! After several days of waiting, the PCBs for my 8Gen2BOX power modification project have finally arrived! They feature a black solder mask with an OSP surface finish, which looks pretty nice. The electronic components have arrived…
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Qualcomm QTM545: A Technical Deep Dive into 5G mmWave, Antenna-in-Package Design, and PCB Ground-Plane Reflection
Introduction Recently, I have been investigating 5G millimeter-wave (mmWave) modules and came across a component marked QTM555. It belongs to Qualcomm’s QTM family, but publicly available documentation on this particular part appears to be scarce.…
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Designing a 2.4GHz Remote Power Switch for an Automotive Jump Starter
Introduction If you regularly work on cars or keep a portable jump starter in your vehicle, you may have noticed a small but annoying problem with conventional jump starters. Most portable jump starters use a very simple output design: the positive and…
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F1C200S/100S XhtCore-Based Core Board/Development Board
1. Introduction: Why I Built the XhtCore Board The XhtCore project started as a personal effort to revisit the Allwinner F1C200S SoC, organize what I had learned about the chip, and turn that knowledge into an open-source hardware project that others…
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DIY USB-C Isolated USB-to-UART Adapter: CH9102X, Dual Voltage Support, and Full Signal Isolation
Introduction: Why I Designed My Own Isolated USB-to-UART Adapter A USB-to-UART adapter is one of the most frequently used tools on an electronics engineer’s workbench. Whether I am debugging an MCU, capturing boot logs, flashing firmware, or…
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