etch pcb

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 sharing. Fritzing is a simple and easy-to-use software operation interface, this allows users to

wiring is initiated from the most complex devices connected on a single board. The most densely connected area on a single boardStart cabling. Loop minimum rule, that is, the signal line and its return loop area to be as small as possible, the smaller the ring area, external radiationThe less it gets, the smaller the interference from the receiving world. For this rule, in the ground plane division, we should consider the ground plane and the heavyTo signal the distribution of the line, to p

Tags: class Bubuko sel info varchar into IMA handle mergeOne of the blog posts in the "PCB MS SQL sorting application---adjacent data and the same merge processing" This article should also be used in conjunction with the same technique, to achieve the adjacent data interval value solutionExample:Original data: Before processingCalculate interval value: After processingSQL Code ImplementationDECLARE @table Table(RowNoINT, FlowtechnameVARCHAR( -))INSER

Which components can be made into PCB files?In PCB design, some components do not need to be made into components for the sake of speed.It is a waste of time to make components, and there is no actual component in production.As follows (continuous update ): The PCB is connected to the PCB before the manual post w

Engineers using Protel 99SE know that Protel in the PCB drawing is not support the Chinese character input, but as a factory production debugging convenience, the inevitable in the PCB to make Chinese marks, and sometimes for the purpose of explaining the Board, attention to matters such as to enter Chinese silk screen, So how do I enter Chinese when Protel does not support Chinese? This experience will be

attributee page in the component Properties dialog box.18. Can I write the sequence number of the element symbol in the Sch diagram as a subscript?A: No.19. In the schematic diagram of PROTEL 99 and the printing plate diagram, how to deal with the linkage components (such as the potentiometer with a switch and the tuning capacitor)A: Draw a dotted line using drawing tool bar Drawing tools in sch. This problem does not exist in PCB.20. Whether automat

What is PCBIn order to describe the operation of the control process, the data structure of the management and control information of the process in the system is called Process Control block, which is part of the process entity and is the most important recorded data structure in the operating system. It is the most important data structure of process management and control, each process has a PCB, when the process is created, the

The new PCB file defaults to the 2-layer board, which teaches you how to set 4 layers or even more multilayer boards. On the toolbar, click design-->layer Stack Manager. After entering the display is a two-layer board, added as a 4-layer board, usually first point top layer, then add layer, and then add layer, so it becomes a 4-layer board . See figure below. Some people do not point to add layer, but point to add plane, the difference is that the

First, preface:The so-called interaction is such, in the schematic click on a component, in the PCB diagram is selected, so that the component just lead into the PCB layout of the components can provide us with great convenience.Second, the premise:Importing components in the PCB is this way: Where the path is the path where the schematic is located.

Transferred from Zhang Fei actual combat electronic public numberGeneral principles of PCB cablingShortest path and reduced interferenceThe overall process of PCB cabling is as follows:1 understand the manufacturing specifications of manufacturers-line width, line spacing, over-hole requirements and layer requirements;2 Determine the number of layers and define the functions of each layer;3 Design Cabling r

(1) role of the process control block-the process has a unique entity; Because the process control block records the existence and characteristics of the process, the PCB and the process are born to death. When a process is created to establish a PCB for it, the process is revoked, the system will be subject to its PCB. The OS controls the process according to t

1 : no function is provided in the circuit. It is only for convenience of debugging or Compatibility Design on the PCB. 2 : Jumper can be used. If a line is not used, do not paste the resistor directly (without affecting the appearance) 3 : when the matching circuit parameters are uncertain, use 0 ohm instead. during actual debugging, determine the parameters, then, it is replaced by a component of a specific value. 4. when you want to test the

-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

Three-day reboot of wayos hardware version 1.1 correction version fixed on the basis of the first version 1. Low-Level drive to avoid sending reset signals during power-on, leading to unstable USB voltage power supply during secondary calls on some boards 2. added the power-on function to solve the problem that some old motherboard does not support power-on. This function is optional. 3. added the ISP download function, which can be downloaded as long as there is a TTL line. Original device

Pay attention to the following basic items for the current loop: 1. If you use strip, try to bold it. If the Grounding Connection on the PCB is to be considered, the design should be as rough as possible. This is a good rule of thumb, but you must know that the minimum width of the ground wire is the valid width from this point to the end. Here the "end" refers to the farthest point from the power connection end. 2. Ground loop should be avoided

I. Comprehensive vocabulary1. Printed Circuit: Printed Circuit2. Printed line: Printed Wiring3. Printed Board: Printed Board4. Printed Board circuit: Printed Circuit Board (PCB)5. Printed Circuit Board: Printed Wiring Board (PWB)6. Printed component: printed component7. Printed contact: printed contact8. Printed Board Assembly: Printed Board Assembly9. Board: Board10. Single-sided printed board: Single-sided printed board (SSB)11. Dual-sided printed b

Prior to designing the board, I had only heard the relevant concepts, but did not really study si related knowledge. Organize some of the previously seen information as follows:(1) Signal Integrity analysisFactors related to SI : reflection, crosstalk, radiation. the reflection is caused by impedance mismatch on the transmission path; Crosstalk is caused by line spacing, and radiation is related to the high-speed device itself and the PCB design.Trans

TAB: Adjust PropertiesPgUp: Zoom InPgDn: ShrinkingDelete: RemoveCTRL + C: CopyCtrl + V: PasteCtrl+x: ClippingCTRL + Z: UndoCtrl+y: Cancel UndoCtrl+f: FindCtrl+h: Find and replaceSpace: Component Counterclockwise rotation 90°X: Swap the components aroundY: The components are swapped up and downV->f: Suitable for all components displayE->d: Remove Selected ComponentsE->s->a: Select all the ComponentsE->e->a: Cancel All Selected ComponentsSch Edit Shortcut keysP->w: Placing linesP->P: Placing Compo

Tags: color number font with ROM class implementation int ordinalThis is a very interesting SQL data processing application, the specific requirements are as followsERP needs engineering to combine the coding of the adjacent code with the sum of the BOM amount, cleverly used in the existing sorting number and the group sort number between the solution of the differenceExample:Original data:Required Conversions:Actual post-conversion data:SQL code implementation: withTab1 as(Select 1 as [Rank],1

Tags: PNG rom 9.png and technology weight ASE Col caseI. Original data: select inman,indate from [ fp_db ] . [ dbo ] . [ ppezhpbb where indate > " 2016-5-1 " and indate 2016-6-1 " ORDER by indate Two. After conversion: SELECT CONVERT(varchar( -), Indate, at) Indate,sum( Case whenInman='Lo Dingpeng' Then 1 Else 0 End) Lo Dingpeng,sum( Case whenInman='Wangbo' Then 1 Else 0 End) Wangbo,sum( Case whenInman='Liao Guan Long' Then 1 Else 0 End) Liao Guan Long,sum( Case