circuit board risers

The reset circuit of the stm32f411 chip in the Wang Gong's small board is as follows:In fact, this circuit is wrong, after the actual measurement, stm32f411 chip runtime reset pin is high, and in this circuit diagram, in fact, the stm32f411 chip runtime reset pin level to see the low level, according to this

parts: pins, principles, and annotations. Let's take the symbol of the luminous second-level tube as an example to illustrate the structure of the schematic symbol, as shown in figure 1. The electrical connections between schematic symbols can be connected through nodes, connections, bus, pages, ports, and other methods. There are some differences between different design software, but the general idea and meaning are basically the same. A good schematic diagram looks well organized and

ObjectiveThe last two days using AD14 software designed a Bluetooth anti-loss circuit board (PCB) drawings, the middle of some details in this document, to facilitate the next design of the PCB reference. Also hope to give the layman's classmates or just into the students a macro view of the General circuit board desig

Common fault problems caused by wet circuit board time: 2016-02-03-19:52:53 EDIT: Electrician column: Circuit Guide: Wet caused by the common circuit board failure, resulting in circuit

The switch in the use of the process, in a dual-machine state can not run, through detection, the signal is the standby side of the circuit board is not normal. This fault is obviously a hardware failure. First of all, we can replace the circuit board of the standby side with the replacement method. If the faul

After several circuit board welding experiences and lessons, we will summarize the circuit board welding skills and steps: 1. Check whether the circuit board has obvious faults. For example, some cables in the

Recently made a mistake Test action:test Scenario: direct from the mains socket to access the 3W non-isolated switching power supply circuit board, using an oscilloscope to test the output voltage, when the oscilloscope through another outlet directly from the mains powertest Result: in the oscilloscope to the output negative moment, the leakage protection switch trip!!!After consulting, analysis, just unde

What about the computer board short circuit? What is the reason for the motherboard short circuit, how to solve? We often take down the motherboard to clean, and so on when you forget the switch and reset button that row of pins is inserted, with the copper key in the row of pins swept a bit, saw sparks Flash, the motherboard has no movement. Troubl

What is a soft printed circuit board? Starting in 1960, V dahlgreen attached a metal foil line to a thermoplastic film. Then, the flat cable is replaced to form a printed circuit line pattern on the soft insulation board. In the end of the 1960 s, after the PI (Polymide) substrate film was imported and used, so far, th

Install the Open Source PCB printed circuit board design software Fritzing in Ubuntu Fritzing is a set of software for designing Printed Circuit boards (Printed Circuit Board), especially for designers, artists, researchers and amateur players. Like Processing and Arduino,

Disclaimer: This article is an original work and copyright belongs to akuei2 and heijin power Community (Http://www.heijin.org) All together, if you need to reprint, please indicate the source http://www.cnblogs.com/kingst/ 3.1 experiment 7: digital tube circuit drive If you have studied single-chip microcomputer, do you know more or less about digital tubes? I will not repeat these basic knowledge, because there is already a lot of such informati

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Glass-based panels can be used at temperatures up to 150 ℃ to 250 ℃. The optional media materials are: FR4, dielectric constant ε0 of 4.6 Epoxy material, dielectric constant ε0 is 3.9; Polyimide, dielectric constant ε0 is 4.5. In addition, PTFE-based materials have the lowest dielectric constant and operate at temperatures up to 300 ℃, where PTFE, dielectric constant ε0=2.1; thermally solid PTFE, dielectric constant ε0=2.8; Glass-fiber PTFE, dielectric constant ε0=2.4;

The next-door King has already talked about the principle of TDR and how to determine the TDR resolution. So, we have to correctly measure the circuit impedance on the PCB board, and what needs to be noted?1, the impedance Test industry standardsHave posted a lot of impedance test pictures, re-paste a picture for everyone to see. Impedance is not an imaginary straight line, but a downs. In the front and bac

Fritzing is a set of software designed for PrintedCircuitBoard printed circuit boards. It is a tool especially intended for designers, artists, researchers, and amateurs. Like Processing and Arduino, Fritzing developers design this software in the spirit of openness, simplicity, and sharing. Fritzing is a simple and easy-to-use software operation interface, this allows users to easily design PCB printed circuit