Last time I needed to use the 89C51 microcontroller, the K1200 programmer had some issues. I wasn’t sure if the problem was with the programmer or the microcontroller, so I decided to make a simple 89C51 programmer myself, mainly to save money and use materials I had on hand. The circuit diagram was referenced from … Read more
Problem Statement Dear Zhu, I recently encountered a problem that I would like to consult you about. We are using the OPA2350 for our electromagnetic operational amplifier, and instead of copying a board, I designed a circuit myself. The waveform simulated in Multisim is correct, and the rectified waveform is also correct; when I tested … Read more
In the critical stage of integrated circuit (IC) design before tape-out, the routing layout becomes a crucial factor in determining the chip’s performance, power consumption, and reliability. A reasonable routing strategy not only optimizes signal integrity but also effectively reduces noise interference, ensuring the correct implementation of chip functions. 1. Control Wire Length and Enhance … Read more
Polarity components require special attention throughout the PCBA processing, as incorrect orientation of directional components can lead to mass failures and the complete failure of the PCBA board. Therefore, it is extremely important for engineering and production personnel to understand SMT polarity components. 1. Definition of Polarity Polarity refers to the positive and negative terminals … Read more
With the rapid development of the times, PCB and high-speed PCB design have become essential design skills that contemporary electronic engineers must master. It is also necessary to understand PCB manufacturing processes and PCB simulation methods. Today, we will discuss and analyze the classification and characteristics of PCBs. Generally speaking, printed circuit boards can be … Read more
As we all know, a fully functional electrical device requires a good circuit board, quality components, and a plastic or metal casing, along with switches, etc. Today, we will hand-wire a PCB layout ourselves. This circuit is quite simple, requiring only basic series and parallel connections, along with a four-transistor microphone amplifier, which does not … Read more
In the field of electronic manufacturing,PCB and PCBA are two extremely important concepts, yet many people have a vague understanding of them and often confuse the two. Today, we will delve into what PCB and PCBA are, and explore the differences and connections between them. 1. PCB (Printed Circuit Board) — Printed Circuit Board PCB, … Read more
How many of the five circuit diagrams below can you understand? TDA2030 Circuit Diagram 34063 Circuit Diagram 555 Circuit TDA2030 Circuit Diagram Transistor Discrete Component Circuit Now that you have looked at these circuit diagrams, can you understand how each circuit operates? If you can, congratulations, you have entered the world of electronic design. If … Read more
Confucius said: “When you see someone virtuous, strive to be like them; when you see someone unvirtuous, reflect on yourself.”—— from “The Analects of Confucius, Chapter on Benevolence” Explanation:When you see someone with better character and ability than yourself, you should think about how to work hard to be like them; when you see someone … Read more
1. Function Definition An optocoupler (光电耦合器, Optocoupler) is a semiconductor device that achieves electrical signal isolation and transmission through optical signals. Its core functions are electrical isolation and signal transmission. It consists of two parts: •Input side (light-emitting side): Typically a light-emitting diode (LED), which converts electrical signals into optical signals; •Output side (light-receiving side): … Read more