etch pcb

thread_struct thread is saved to the task_struct of the stop process; File system Information struct fs_struct *fs; Open file information struct files_struct *files; Signal processing function spinlock_t Sigmask_lock; struct Signal_struct *sig; Signal processing function sigset_t blocked; A signal that the process is currently blocking, with each signal corresponding to a struct sigpending pending; Whether the process is pending signal unsigned long sas_ss_sp; size_t Sas_ss_size; Int (*no

Formula for propagation delay of cabling in PCB The first half is information from altera. The propagation latency (tPD) is the time required to transmit a signal from one point to another. Transmission Line propagation delay is a function of the relative dielectric constant of materials. Propagation delay of micro-Strip Layout You can use formula 5 to calculate the propagation delay of the strip layout. Formula 5: Delayed propagation in the line

Address: http://www.sig007.com/usesoft/74.html Schematic Design Software: orcad can be used, and supports a large number of netlist, which is basically industry standard. PCB layout Software 1. Protel, now push alicloud designer. The mainstream of low-end design in China is basically useless in foreign countries. It is easy to learn and suitable for beginners.High Computer Configuration Requirements. People who use Protel in China still have

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 cause the circuit board is not easy to place,

Circuit Design: This is a very big concept, from the voltage intensity can be divided into strong electric circuit design and Weak Current Circuit Design; from the design tool can be divided into manual drawing and electronic auxiliary design, the circuit types can be divided into analog circuit design and digital circuit design. Icdesign: The IC Design refers to the chip design, that is, the design of the circuit on a crystalline silicon chip, which requires a high process and technology. Th

Linux drawing schematic and PCBThe famous Allegro and classic Protel 99SE under Windows are not supported by Linux operating systems, and it is unavoidable to look at schematics and PCBs for Linux driver development.There are three general ways of doing this:1. Host uses Windows system, Linux installed in virtual machines such as VMware so that you can use the software under Windows to see the schematic and PCB;2. In turn, a Windows virtual machine is

PCB design software Cadsoft Eagle Professional v7.5 multilingual Win64 1CDCadsoft Eagle Professiona is an easy-to-use printed circuit board design software that includes a schematic editor, PCB editingand automatic wiring three modules, convenient for the designer to operate. Cadsoft Eagle Professiona Support Chinese versionDownstream products 2015.11 1CD industry-leading

. The specific capacitance is best for the same noise compensation as the self-resonant frequency, and we measure this phase relationship with this frequency. When the disturbance zone to the distance of the capacitance, the phase of the compensation current and the noise source phase is exactly the same as 180°, that is, the full reverse phase, when the compensation current is no longer in effect, the decoupling effect is invalid, the compensated energy can not be delivered in time, in order to

component encapsulation, and dip8 is double-row, each row has four pins, the distance between the two rows is mil, the distance between the pad is 100mil. Sipxx is the encapsulation of a single row. And so on. It is worth noting that the packaging of transistors and variable resistors is the most headache. the PINs may not be the same for the same packaging. For example, for packaging such as TO-92B, usually 1 foot is E (emission pole), and 2 feet may be B (base pole), or C (collector ); simil

Take Altium Designer 6.9 for example:1. Click Dxp→run Script.2. Click Browse to open: ad's installation directory under \altium Designer 6\examples\scripts\delphiscript scripts\pcb\pcb Logo Creator\ PCBLOGOCREATOR.PRJSCR file3. Select Runconverterscript, then click OK.4. load the BMP file and select which layer you want to put on the PCB, click OK, and that's goo

I. Circuit board DESIGN steps In general, the basic process of designing a circuit board can be divided into three major steps. (1). circuit schematic design: circuit schematic design is mainly PROTEL099 schematic design system (advanced Schematic) to draw a schematic diagram of the circuit. In this process, to make full use of the various schematic drawing tools provided by PROTEL99, various editing functions, to achieve our goal, that is, to get a correct, beautiful circuit schematic diagram

Annotated Source: http://www.cnblogs.com/einstein-2014731/p/5650943.htmlCadence is more cumbersome to use than Altiumdesigner, but more open and flexible, and it's a good choice to get used to.The method of adding Chinese characters to the PCB was found on the Internet and summarized below.1, install AutoCAD, I use 2010, and install the Express tool tools.If AutoCAD is already on the computer, but the plugin is not selected, it can be done by: program

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 back end will be affected by the probe or open c

This semester we learn the operating system, so we have to write a PCB.So I borrowed a bit of Windows PCB, wrote thisImportsSystem.Runtime.InteropServices" " " "This is the legendary PCB." " StructurekprocessDimHeader asDispatcherheaderDimProfilelisthead as LinkedList( of Processprofilesimulator) DimDirectorytablebase as UInteger DimLdtdescriptor asKernelglobaldescriptortableentryDimInt21descriptor as

1 Creating a PCB file---New2 Create a Board box add-on line, choose the option selection, the frame is long 4400mil width 32003 to the PCB frame chamfer (can not do): manufacture, drafting, Fillet (round), in the Options option, the chamfer radius is set to 100milMethod: Which corner to pour, the right mouse click on the corner of the two sides, four corners are poured, the right mouse button and done4 Add

Open the schematic and the corresponding PCB, click Pads Layout in the toolbar to connect the schematic and PCB.Right-Select the original in the schematic to select a module, and then right-click on the PCB to select a module to put together.When moving, rotate the originals by pressing the TAB key, Ctrl+e move the originals, and press Ctrl+r in situ. Select the original right-click feature to place the ori

is actually painted the most tangled piece of PCB, the left wiring is very easy, but the right 32 chip to FSMC, there are a lot of out of the IO port, cross-tangled together, there are a few lines all the way to hit 3, 4 through the hole, it is difficult to cloth.Engineering Check the next is the June 17 painting schematic diagram, today, at noon, and then today 3 o'clock in the afternoon to vote for Gali, almost two weeks of time, although there are

2004 accompany the German customers to visit the manufacturers, walked a circle, and finally to the PCB factory. Still the dirty, I took them a quick lap into the factory's conference room. Before, the German foreigner asked me to accept the "Gerber" file? I had no idea what he was talking about, so he replied that I needed the CAD file and he looked embarrassed. I sent to the factory is all the Protel format of the

interference refers to the interference source passing through spaceCouple the signal (interference) to another electrical network. In the design of high-speed PCB and system, high-frequency signal lines and integrated electricalChannel pins and various connectors may become radiation sources with antenna characteristics, which can emit and affect electromagnetic waves.The normal operation of the system or other subsystems in the system.Since the eme

This is an assignment in the operating system class. I attended the course. Maybe it is because of the attendance that I always hold on to the task with a single delay, I have no idea about my homework in this course. This process scheduling job has already been handed in. I want to write some programs over the past two days. By the way, I will update the content in my blog. If you talk less, you can write more comments instead of organizing the language. Basic Structure: Use the data structure