make pcb board

and PCB. For example, mechanical Layer 1 is used to draw the PCB shape and hollowing, and mechanical layer 13 is used to annotate the size, technical staff of printed board manufacturers after separationThe personnel will analyze whether or not to make the layer based on the content of this layer.5, topOverlay (top-la

staff will be based on this layer of things to analyze whether it is necessary to make this layer.5.Top Overlay (top layer silk screen) (yellow) is the character of the front of the board, corresponding to the Toplayer (top) Single panel on the use of this layer of characters, Bottom Overlay (bottom layer) (brown) corresponding to Bottomlayer (bottom) Is the character of the back of the

(board shape one will say):4. Positive and negative copper and regional copper:4.1. Select the face to apply copper to, such as the top Layer4.2. Because the antenna part of the front and the surface can not be applied, so choose to let the part is not enough: placement----------------4.3. Click: Place-and-polygon to apply copper to the area where copper is required4.4. The reverse is also the same, finally remove the forbidden wiring area5. Redefine

and buried hole technology, it not only realizes the function of conduction hole, but also saves many wiring channels, so that the wiring process is more convenient, smooth and more perfect. In most tutorials, the use of blind and buried holes in the design of multilayer boards is also advocated. This can make wiring work easier, but it also increases the cost of PCB design. Therefore, whether to choose th

General principles of PCB Board component layout:The general principles that designers need to follow in the layout of PCB boards are as follows.(1) Components preferably single-sided placement. If you need to place components on both sides, placing pin components on the bottom layer (Bottom layer), it is best to place the components one-sided. It is possible to

Use the Keepout layer to determine the size of the line:Follow the steps in the diagram:1. Select the corresponding tag of the menu bar2. Select "Place lines" and draw line options3, in the black area of the PCB project can be drawn lineNow the line you draw is in the keepout layer, the line is pink!The boundary of the line is the boundary of the board"If you draw a line that is not pink, you need to re-sel

We all know that PCB is to turn the designed schematic diagram into a real PCB Board. Please do not underestimate this process. There are many things that work in principle that are hard to implement in the project, or what others can achieve, but others cannot. Therefore, it is not difficult to do a PCB, but it is not

--------------------------------------------------------------------------------------------------------------- ---------------------Sheet TechnologyThe following parameters or tables represent only part of the plate process and simulation selection parameters, the actual production will have a certain difference (but not a small deviation!). ）The simulation software uses Polar's "Si9000".1oz=28.35g,1oz copper thickness refers to 1 square feet of area on average copper foil weight equa

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;

When using DXP, there are no issues such as Web table import, and most of the behavior is that the software is automatically completed, but not in Allegro, and it needs to be done manually. Note that when you draw the circuit board, you must first determine the drawing area, as well as the status of each layer, boundary, installation hole, etc., are not arbitrary to modify. To generate a Web table , you first need to re-edit the component number , sel

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, Fritzing developers design this software in the spirit of openness, simplicity, and sharin

Summary of PCB multilayer Design Reprinted: PCB multi-board design suggestions and examples (, 12) Design requirements: A. The component plane and welding plane are complete ground planes (shielded ); B. There is no adjacent parallel wiring layer; C. All signal layers should be adjacent to the ground plane as much as possible; D. The key signal is adj

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

-Cache and 32 KB D-Cache Supports up to 256 mb ram and SD-card 1t1r 2.4 GHz with 150 Mbps PHY Data Rate Legacy 802.11b/g and HT 802.11n Modes 1-port 10/100 Fe phy SD-XC, emmc, I2C, PCM, I2S (192 K/24 bits), PWM, SPI Master/Slave, UART lite, JTAG with gpio Https://bbs.usoftchina.com/thread-203456-1-1.html The mt7688 chip group integrates 1t1r 802.11n wi-fi radio, 580mhzmips | 24kec CPU, 1-port Fast Ethernet phy, USB2.0 host, PCIe, SD-XC, i2/PCM and multiple low-speed iOS devices. Mt7688 supports

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 boards without the background of an elec

Capacitance modelCapacitance parallel high frequency characteristicsInductance ModelInductance characteristicsMirror image surface ConceptHigh frequency AC current loopThrough-hole (VIA) examplePCB Board Layer SegmentationBuck power supply: Power partial current and voltage waveformExample of a step-down power supply layout errorCircuit equivalent diagramPCB Trace-via Inductance estimationPlacement of pad (PAD) and bypass capacitorExample of step-down

We all know that PCB is to turn the designed schematic diagram into a real PCB Board. Please do not underestimate this process. There are many things that work in principle that are hard to implement in the project, or what others can achieve, but others cannot. Therefore, it is not difficult to do a PCB, but it is not

Make use of "more" to create a message board, comment system, message board comments Message board and comment system will often be used in the site construction, today for everyone to introduce how to use more to say for their own website to create a message board, comment

PHP make text message board, PHP text message board The code is simple, not much nonsense, directly on the code: del.php Copy the Code code as follows: My message board Delete message $id =$_get["id"]; $info =file_get_contents ("Liuyan.txt"); $lylist =explode ("@@@", $info); Unset ($lylist [$id])

Php+ajax make no refresh message board, phpajax Refresh message Board This article is to share with you a PHP with Ajax implementation of the non-refresh message board, first of all to see the last: The database connection code is as follows: The index.php file code is as follows: No refresh display re