The ROC-RK3399-PC features a high-performance core configuration from Rockchip, unique multiple power supply options, and a distinct board design that allows for expansion board integration, resulting in superior performance. Combining it with a metal casing transforms it into a pocket-sized portable personal computer. Compact Size, Card Computer The unique board design follows the golden ratio, … Read more
Click the blue text to follow us Let me tell you, back in the day when there were no test diagrams, repairing a motherboard was like looking for a needle in a haystack. Now, with test diagrams, repair efficiency has at least tripled! However, I see many beginners looking at test diagrams as if they … Read more
This article explains the voltage matching issues of regenerative feedback servo drives using Siemens’ SIMODRIVE611 series drives as an example. The SIMODRIVE611 was once one of Siemens’ main servo drive products, widely used in systems such as SINUMERIK840D/810D/802D/840C, and is specifically divided into 611D (digital), 611U (digital-analog hybrid), and 611A (analog) types. Compared to traditional … Read more
Electromagnetic compatibility refers to the ability of a device or system to function properly in its electromagnetic environment without causing unacceptable electromagnetic interference to anything in that environment. The purpose of electromagnetic compatibility design is to ensure that electronic devices can suppress various external interferences, allowing them to operate normally in specific electromagnetic environments, while … Read more
Troubleshooting Inverter Circuit Boards Generally speaking, the printed circuit boards on an inverter mainly include the drive board, main control board, and display board. The factors affecting the lifespan of the inverter’s printed circuit boards include the lifespan characteristics of the smoothing capacitors in the power supply section and the buffer capacitors in the IPM … Read more
When learning about fire alarm systems, many people encounter the professional terms “Two-Wire Bus”, “Two-Wire System”, and “Four-Wire System”. So, what do they mean? What are the differences and application scenarios? Today, we will quickly clarify these common concepts! 1. Starting from the basics: Where do the Two-Wire Bus, Two-Wire System, and Four-Wire System come … Read more
Power supply ripple testing is a crucial parameter in power quality detection, but accurately measuring power supply ripple has become a challenge for engineers. How can we overcome this problem? In fact, after searching for it thousands of times, the solution is right there in front of us. Because a DC regulated power supply is … Read more
Today we analyze a classic microcontroller power supply circuit. The circuit schematic is shown below: ▲ Simplified Switch Circuit Before powering the circuit, the switch “TEST” is open, and the microcontroller is not powered through VCC. At this time, the base of T1 is grounded through R9 (100k), and is in the cutoff state. The … Read more
Power Integrations has released a new design example report (DER-832) – this single live wire Bluetooth Low Energy (BLE) smart wall switch does not require a neutral wire connection and can power LED/fluorescent/incandescent bulbs from 3 W to 600 W. This design is based on PI’s high-efficiency LinkSwitch-TN2 offline switch power supply IC, featuring ultra-low … Read more
Electric valve actuators are ubiquitous in today’s industrial space. They can be found in various industries and applications, including water treatment and wastewater treatment plants, hydroelectric power plants, refineries, shipyards, and many processing industries such as chemicals, food and beverage, pulp and paper, and pharmaceuticals. It is crucial for anyone responsible for selecting and operating … Read more