etch pcb

The computation of PCB streaming capability has always lacked authoritative technical methods and formulas. Experienced CAD engineers rely on their personal experience to make more accurate judgments. However, it is difficult for new users to use CAD. The current Loading Capacity of PCB depends on the following factors: line width, line thickness (copper foil thickness), and allowable temperature rise. As

Because our circuit board obviously cannot use the auto-wiring function, we should pay attention to the price of moving components at a time, especially holding computers with ultra-slow speed. While our PCB Board is still relatively complex, with many layers, multiple channels, and more room. Therefore, we need to fix the key devices or room, to avoid unnecessary movement of components. In the PCB, this i

1. Signal line do not take the corner, go straight. 2.PCB, at right angles there will be radiation effects, electromagnetic compatibility problems. 3. Follow the modular layout and regional layout. 4. Line thickness consistent, otherwise it will heat uneven, welding problems. 5. Ground mode, single point grounding, multi-point grounding. 6. Determine where the noise comes, first exclude peripheral devices, and then eliminate the program, and fina

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

Always wanted to make a minimum system, this time finally put the idea into reality. Schematic diagram is as follows:The PCB diagram is as follows:After a few days, the board finally mailed to, is the following bear-like.Welding the voltage regulator circuit, found that the voltage regulator circuit schematic part of the wrong, no grounding, and then fly the root line, the regulator circuit is stable and easy to use.Welding Stm32 chip, where VCC and g

PCB Inspection MattersCheck that the device is all finished,Check that the cables are all finished,Check dangling Line,via,See if the copper skin is isolated and has no network copper skin,Check the DRC,1. Select the menu display-status to see if the marker is at 0%2. Execute Tool-quick report-unplaced Component report.3. Execute Tool-quick report-design Rules Check.Creating a drill Table1. Select Menu Manufacture-nc-drill Legend2. With the default se

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;

Note: The post posted by the author on www.21ic.com is now reproduced. Http://bbs.21ic.com/icview-343175-1-1.html part 1/3. When editing a blog post, the typographical conflicts with the web page have been changed several times. I don't know if it is a problem with sogou browser. Once the pictures on bbs.21ic. com are referenced, the layout of the blog is disordered. If you know the situation, tell me the reason. Thank you. First PCB: Bytes ----

relationship with the specific resistance value, but the package size is related to the power. Generally, the package size is 0201 W. 0402 1/16 million 0603 1/10 million 0805 1/8 million 1206 1/4 million The relationship between the shape size and encapsulation of the capacitor resistance is as follows: 0402 = 1.0x0.50603 = 1.6x0.8 0805 = 2.0x1.2 1206 = 3.2x1.6 1210 = 3.2x2.5 1812 = 4.5x3.2 2225 = 5.6x6.5 2. Common shortcut keys: Q -- switch between the display unit mil and mm P -

Recently, after drawing a four-rotor PCB, I want to print it on A4 paper to see if the device is properly placed. Because my computer is not connected to the print sister, I can't print it directly, the intelligent PDF file of AD is used to print the Board files in pdf format. The result is that the printed board is enlarged and the original proportion is lost. In this way, the meaning of printing is lost. Later, I found a convenient method, in AD fil

is a data structure to manage the process settings. Is the only sign that the system-aware process exists.Typically contains information such as the following:(1) Process identifier (unique)(2) Process current state, usually the same state of the process will be placed in the same queue;(3) Procedure and data address of the process(4) List of process resources. Lists the resource records owned by other than the CPU.(5) Process priority. Degree of urgency of the reaction process(6) CPU field prot

post. Add the package , in the schematic, in the DSN file right-click, select Editor Object property, check the PCB footprint This column is not the package of each device has been filled in, and is not corresponding to the schematic diagram. If that's the case, it's a big part of the success. The final check checks, you can generate network tables ,DSN files, Tools---Create netlist, generate the device package and schematic one by one corresponding

Tags: cal err miss str picture. dll Net PNG comPCB cycle calculations Use SQL functions to invoke. NET DLL implementations (for code reuse purposes) Played SQL Server database often write stored procedures, functions and so on, when the business logic is too complex, write with SQL is a nightmare, Here the PCB cycle function is written in. NET, using MS SQL to call. NET basic steps to sort out the following 1th step: SQL Server CLR configuration (all

0 Preface PCB drawing process is undoubtedly a big head, when the end of the long wiring phase, you also need to add a beautiful screen for your components, the end of these work and the last few steps need attention, this time to summarize the PCB post-processing work and inspection work. 1 Check that the device is fully positionedAn easy way to do this is to select the menu display->status to see if the

Wave automatic soldering technology has been used in the electronics industry for many years, but the late failure of solder joints is still a headache, which greatly affects the quality and reputation of electronic products.This paper intends to make a preliminary study and discussion on the basis of practical experience.The so-called "late failure of solder joints", refers to the surface appears to be the quality of the solder, there is no "lap welding", "Half welding", "pull the point", "copp

Autodesk (ex Delcam) Crispin lastmaker R1 Win64 1CDAutodesk (ex Delcam) Crispin Techpac R1 Win64 1CDClo3d. Modelist.v2.2.134.macosx 1CDClo3d. Modelist.v2.2.134.win64 1CDensoft.lpile.2015.v8.03 1CDEsri ArcGIS Desktop v10.3.1 Win32 1DVDTecplot.chorus.2015.r2.v15.2.0.62355.linux.x64 1CDTecplot.rs.2015.r1.v1.1.63937.linux.x64 1CDTecplot.rs.2015.r1.v1.1.63937.win64 1CDPhone tel:18980583122 Customer Service qq:1140988741coreldraw.graphics.suite.x7.6.win32_64 2DVDfabric.software.fabric.engine.v2.0.0 1C

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 power supply typesettingExample of step-down

Most of the components are compiled from the Http://www.3dcontentcentral.cn/default.aspx website and modified according to the circumstances of the 3D module-soildworks source files (excluding the IC section), just create step format can be imported into the ad. Of course, 3D Library and step files I do not contribute, after all, it is not easy to tidy up, we do their own, clothed.Step file is too big, can only send Baidu cloud disk link, you need to download it yourself. Http://pan.baidu.com/s/

PCB highlights: August 5, 2014 13:04 Ground Line Design 1.1 classified analog, digital, shell, and system land 1.2 grounding mode: Single Point Grounding (F 1.3 increase the ground line, increase the running current, and increase the anti-noise capability> 3 m Electromagnetic compatibility: 2,. 1 adopts the #-shaped wiring, that is, vertical wiring mode and metal hole reducing are adopted to avoid long distance parallel. 2.2 wire width is suitable. S

generated with the schematic diagram. The flying line displayed on the PCB can greatly help layout and cabling. Do not use the X or Y keys to flip the component during component layout; otherwise, the component cannot be welded. One way to strip two-layer panels is: one side only follows the horizontal line and the other side only follows the vertical line. Do not add irrelevant overholes near the pad. In the design rule, the widt