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Requirements of power layer, stratigraphic partition and flow-hole:     Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  For PCB multilayer, there is at least one power layer and one layer. Because of all the voltage on the PCB are in the same power level, so you have to partition the isolation of power supply layer, the size of the partition line generally USES 20 ~ 80 mil line width advisable, ultra-high voltage, the more coarse partition line. In order to increase the reliability of the welding hole and the power supply layer and the stratigraphic connection, it is necessary to design the shape of the flower hole to reduce the large area metal heat absorption in the welding process The aperture of the isolation pad is greater than that of borehole aperture +20mil Requirements for safe spacing The setting of safety spacing should meet th...

. PCB design considerations   Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  (1) avoid setting important signal lines on the edge of PCB, such as clock and reset signal. (2) the distance between the ground wire of the enclosure and the signal line is at least 4mm; keep the length and width of the ground wire to be less than 5:1 to reduce the inductance effect. (3) lock the device and line that identified location with LOCK function, so that they will not be misused. (4) the width of the conductor should not be less than 0.2mm (8mil). In high-density and high-precision printed circuit, the width and spacing of the wires are generally preferable to 12mil. (5) Routing in the IC pin of DIP package, 10-10 and 12-12 principles can be applied, as between the two pins by 2 lines, diameter of bonding pad  can be set to 50 mil, width and spacing of line is 10 mil, when o...

5. General principles of PCB design Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  The special components layout First, consider the size of PCB: when the size of PCB is too large, the printing line is long, the impedance increases, the anti-noise ability decreases, and the cost increases  too  small, so the heat dissipation is not good, and adjacent lines are easily disturbed.   After determining the PCB size, make sure the location of the special components.   Finally, l ay  out.the entire components of the circuit   according to the function unit of the circuit . The following principles shall be observed in determining the location of special components: A. To minimize the connection between high frequency components, try to reduce their distribution parameters and electromagnetic interference between them.   Vulnerable componen...

3.  L ayout inspection Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  1. Whether t he size of the circuit board consistent  with  the processing size  that required of the drawing . 2. Whether the layout of the components is balanced, orderly and complete. 3. Whether t here is no conflict at all levels ,such as component, outside frame,   the level of private printing is reasonable. 4. Whether t he commonly used components are convenient to use ,s uch as switches, plug-in board inserts, components that need to be replaced frequently, etc. 5. Whether the distance between heat sensitive components and heating components is reasonable. 6. Good heat dissipation. 7. Whether the disturbance of the line needs to be considered. 4. the main sequence System specification: first, the system specifications of the electron...

What can you do with it   Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  The big advantage of Raspberry Pi is that it doesn't have a fixed pattern. You can use it to play video or browsing the web, also can "play with" it, learn how to use this motherboard to do something, Raspberry PI is a flexible platform that can be played as a toy, a tool or experiment platform. . An ordinary computer Raspberry PI is a computer that can also be used to install free software on the web.You can use it to deal with documents or tables when you can't connect to the network. . Learning to programming Raspberry PI is designed as a teaching tool to encourage young people to carry out various computer experiments, It installs the interpreter and compiler of various programming languages. For beginners, you can use MIT and Scratch Graphical programming language. If you want to start co...

5. see the version   Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  There are so many ways to see the version: 1.by smartphone First, download two software: JuiceSSH              this is terminal AndroidVNC           this is VNC used to display the version Ensure the smartphone and Raspberry Pi has connect to the same network, you can open the USB wifi share of smartphone, then connect Raspberry Pi and smartphone with an USB cable, try to get IP of Raspberry Pi. Open JuiceSSH, set a new connect, give it a name and input Raspberry Pi’s IP, connect it, you can see that it’s easy to write command via smartphone for it has serve for many shortcut key. Set up a software by the following command: sudo app-get install tightvncserver This command ...

2. Connect the Raspberry Pi to computer        Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  Connect your computer and Raspberry Pi to the rooter, let them share the net, for easily find your Raspberry Pi’s IP, you can download the following software into computer: Advanced IP Scanner: http://www.advanced-ip-scanner.com/index3.php?utm_expid=62919999-52.ZgzGnMMDQ7KosMzu7DlCQA.2&utm_referrer=http%3A%2F%2Fwww.advanced-ip-scanner.com%2Fcn%2F If your root has connected many terminal, you can try the software, start the software click the start option, wait a minute, you can find a manufacturer which named Raspberry Pi Foundation, then find the corresponding IP, it’s the host name of Raspberry Pi, open XShell, input the host name at “1”   Raspberry Pi’s name is  pi , password is  raspberry . Then you can input command to your Raspber...

1. Install IMG to your Raspberry Pi        Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  1.prepare for something The IMG of Raspberry Pi is named Raspbian. Download the Raspbian from the following website: https://mega.nz/#!LxcEiZ7A!PSLA5zq7Pa8DAab9gRHZkv4OwMpEGQhPAIUvhl25OXM This IMG has already added driver of Raspberry Pi’s screen. You can also download Raspbian from official website. Then, get a TF card, make sure that the storage is larger than 8G, format it, burn the Raspbian to your TF card, you can down win32 disk imager from the following website: https://sourceforge.net/projects/win32diskimager/ 2.Burn the Raspbian to TF card burn the Raspbian to a TF card by this software   You may find that the whole room of your TF card has been reduced largely, don’t worry, your TF card’s room haven’t been reduced, it’s norma...