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1 Open WindowPADS inside open window is directly put copper skin in the solder layer inside is open window, but also can put a pad so fast and convenient is open window. Generally choose to put a pad is not prone to error.2 when there is an error, we need to turn all the layers open. There may be some network to pull the other layer, but the network is not connected. Therefore, in the detection of PCB connectivity, will be error. This time you need to

In the previous section, the design steps for PCB principles are described in one example, and this section further introduces some of the techniques in the design.Shield : place->directive (instruction)->compile mask to block block diagrams that are not usedAdd rule : Place->directive->paremeterset You can add PCB design rules to your schematic diagramEg: Add a patemeterset, as follows:650) this.width=650;

, 300mV noise needs to be filtered and attenuated to 50mV, which means that the magnetic beads to be divided into 250mV, assuming the load 50Ω,RAC/RL = 250/50, where RL = 50ω, get Rac = 250Ω;(2) power supply rated current 300mA, derating coefficient according to 0.75, then select the minimum rated current not less than 300ma/0.75= 400mA of magnetic beads;(3) The IC supply voltage must not be less than 3.0V, then the maximum voltage drop on the DC resistance RDC on the bead should be less than 0.

ring and the magnetic beads should be used. Their resistance to the high-frequency components in the line is about 10 to several hundred Ω, so it does not play an obvious role in the high-impedance circuit, it will be very effective in Low-Impedance Circuits (such as power distribution, power supply, or RF circuits. Iv. ConclusionFerrite is widely used in EMI control because it can degrade at a high frequency and make the low frequency pass through without any obstacles. Magnetic rings/magneti

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 adjacent to the formation and does not span the

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

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

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

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