In order to adapt to the rapid update of electronic products, product design engineers tend to choose AC/DC adapters that are easy to procure in the market and directly install multiple DC power supplies on the system’s circuit board. Since the electromagnetic interference generated by switching power supplies can affect the normal operation of electronic … Read more
Experimental Scene 1 Introduction Since learning Bluetooth communication with ESP32 and Phyphox during the National Day holiday in 2020, the author has been eager to solve the visualization problem of the relationship between capacitor voltage and charge, attempting to derive the charge amount by integrating the charging current, and then depict the charge-voltage relationship graph. … Read more
Recently, the micro-master utilized Phyphox and ESP32 Bluetooth to explore the relationship between capacitor voltage and charge, achieving quite ideal results. Early Research Axuan Teaching Research Room “Division Method” experiment introducing the concept of capacitance Maker Jiaozuo Using the half-division method to explore the relationship between capacitor voltage and charge Essentially, it involves first charging … Read more
On the eve of the Lunar New Year, the microcontroller enthusiast explored the relationship between capacitor charge and voltage using the ESP32 and Phyphox, obtaining a graph of the relationship between capacitor charge and voltage, with satisfactory experimental results. The source code for the capacitor charging and discharging experiment, previously created, was burned into the … Read more
Recently, I used the ESP32 and Phyphox to depict the capacitor’s charging current image and discovered a strange flat top phenomenon in the current image. This flat top phenomenon does not match the shape of the charging current image in practice, making it difficult to provide a reasonable explanation to the students. This issue must … Read more
Today, I am repairing a backlogged board sent by a Taobao user, the Changhong ZLS47HIS-V1 motherboard, some small capacitors are missing. The main chip is MSD6A818, powered by 12V+24V, with a Nor Flash+EMMC combination. The symptom is that the power light is on but it won’t boot. Connecting to the programmer, the printed information is … Read more
Click the blue text to follow us In electronic engineering and maintenance, the identification and testing of electronic components are crucial steps to ensure the proper functioning of circuits and troubleshoot issues. Each component has its unique characteristics and functions; understanding their identification and testing methods helps engineers and technicians complete their tasks efficiently. 1. … Read more
Due to certain models of eMMC from a specific brand【such as: H26M62002JPR, H26M51002KPR, etc.】 requiring 1.8V for read and write operations, improvements must be made for these chips in the original V2.3 and lower versions: 1. A 3.3V to 1.8V LDO, package: SOT-23 2. Two 1uF-4.7uF surface mount capacitors, package: 0603 The installation effect is … Read more
This article is original by the author, please indicate the source if reprinted. This question has troubled the author for more than 5 years, and one product lost millions due to this issue.Most MCU enthusiasts do not understand why a 22pF capacitor needs to be connected on both sides of the MCU crystal, as this … Read more