etch pcb

Sinox, Macau, China many platform CAD graphics, PCB board, IC I know, HDL hardware description Language narrative, circuit simulation and design software, elemental analysis table, can open the eyes of the world.Recent research Sinox the implementation of Windows edition Protel,powerpcb,autucad, which is considered very cumbersome. On the other thought, Sinox the following in fact there are a lot of auxiliary design software available, but we do not k

PCB packaging is mainly divided into SMD and plug-in type1) SMD Component Package DescriptionLED: color has red, yellow, green, blue points, brightness divided Puliang, highlighting, super bright three and so onClass, the commonly used package form has three types: 0805, 1206, 121 (commonly used package is rb.1/.2)the extension is: 0805C, 0805D, 0805L, etc. Diode: According to the limit of the current withstand, the package form is broadly divide

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 easy to do a PCB.The two major difficulties

Definition of PCB layer:Solder Mask: Solder masks, refers to the board on the green oil on the part, because it is negative output, so actually there is solder mask part of the actual effect is not on the green oil, but tin plating, silver. Help solder layer: Paste mask, is the machine to use the patch, is corresponding to all SMD components of the pad, the size and Toplayer/bottomlayer layer, is used to open the steel network leakage tin. Key points:

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

Shortcut Keys for protel99 and power PCB (pads layout)Shortcut for protel99 I. Principle Image Library P/P: Draw component pins P/A: draw an arc P/L: draw a straight line P/A: Draw a rectangle T/C: Create a new component T/R: Delete the component T/E: Rename the component t/W: Create a new child for the component T/T: delete a child of the component Ii. Schematic diagram CTRL + backspace: Repeat the previous operation Ctrl + backspace: cancel the pre

Note: belong to reprint Many people for the PCB traces of the reference plane is confused, often asked: for the inner layer traces, if the line side is VCC, the other side is GND, then which is the reference plane? To figure this out, you have to understand the concept of transmission lines. We know that the transmission line must be used to analyze the signal transmission on the PCB in order to explain th

transistors and variable resistors, their packaging is the most headache, the same packaging, its pin is not necessarily the same. For example, for packaging such as to-92b, usually 1 feet is e (emitter), and 2 feet may be B-pole (base), or C (collector), the same, 3 feet may be C, also may be B, specifically that, only to get the components can be determined. Therefore, the circuit software is not hard to define the name of the pad (pin name), the same, FET, MOS tube can also be used in the sa

A process is a dynamic description of a program, which is the smallest unit of the operating system's resource allocation (the thread is the smallest unit of the operating system execution entity). for a multi-channel program system, there may be many processes in memory, in order to facilitate the management of these processes, the operating system kernel for each created process to establish a structure to save its related information. This structure is the

First, the circuit design of the advance work1, draw schematic diagram with schematic design tool, and generate corresponding network table. Of course, some special cases, such as the circuit version is relatively simple, already have a network table and other circumstances can not be schematic design, directly into the PCB design system, in the PCB design system, you can directly take the part package, man

The testability concept of PCB DesignThe testability of the product design (De sign for testability. OFT) Product manufacturability is also the main content from the production point of view is also one of the design process. It refers to the design of the product performance can be considered difficult to detect, that is, design products should consider how to use the simplest method of product performance and processing quality testing, or product d

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 ); similarly, the three-legged device

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-select the Keepout layer!" 】Make the

This article is reproduced on the Internet and is only for personal learning. The copyright belongs to the original work. 1. when you start to draw a PCB, please do not arrange your high-frequency cabling according to the common signal line. It is the right way to obtain the reference design from the chip manufacturer. the general chip data manual or related manual will have a high frequency part of the line reference. 2. High-frequency line

PCB Cabling 6 Major principles1 power, ground processing not only in the entire PCB board in the wiring is done well, but due to the power, grounding the consideration of the interference caused by, will make the performance of the product decline, and sometimes even affect the success rate of the product. Therefore, the wiring of electricity, grounding wire to be taken seriously, the electricity, ground no

, when the clock frequency exceeds 100 MHz or the rising edge is less than 1 ns, the signal integrity effect becomes important. In PCB, the signal line is the main carrier for signal transmission. The cabling of the signal line directly determines the superior signal transmission, thus directly affecting the performance of the entire embedded system. Unreasonable wiring will seriously lead to various signal integrity problems, and generate timing, noi

--------------------------------------------------------------------------------------------------------------- ---------------------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

During circuit design, there are more and more power supplies and multiple locations on a PCB, such as 48 V, 12 V-Common types of power supplies such as 12 V, 5 V,-5 V, 3.3 V, 2.5 V, 1.8v1.v, agnd (analog location) dgnd (Digital location), pgnd (Protected Area) the ground plane required for different functions, some IC clearly requires the single point grounding, and the required power supply, ground plane hollowing. In order to ensure high reliabilit

When drawing a PCB, you often need to check the corresponding components on the schematic. If the number of components is small, you can find them. Also, alicloud designer provides a good cross-search function. Here I suggest using two monitors, one with a schematic diagram and the other with a PCB, which makes it easier to find out. 1 use the shortcut key T + c This shortcut key is used in both the schem

Project Processing capacity Process details Number of layers 1~6 Layer The number of layers refers to the number of electrical layers in the PCB (the number of copper layers). At present Jia Lixin only accept 1~6 layer board. Plate type FR-4 Plate Plate type: Cardboard, half glass fiber, all glass fiber (FR-4), aluminum substrate, at present Jia Lixin only accept FR-4 plate. As show