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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...

6. Basic requirement of designing multiple layer PCB       Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  Determine out shape, size, layers. Any plate, there are problems with other structural parts, so the shape and size of the printing plate must be based on the product machine structure. However, in terms of production process, it should be as simple as possible, generally for the long width ratio not too wide of the rectangle, to facilitate assembly, improve production efficiency, lower labor cost. The number of layers must be based on the circuit performance, the size of the plate and the intensity of the line. In the case of PCB multilayer, the application of four layers and six laminates is the most widely used, with four layers as an example, which is two conductor layers (surface and welding surface), a power supply layer and a layer. Th...

Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  The SIM808 GPRS/GSM+GPS Shield V1.0 is based on the chip named SIM808, it communicates with Catduino Uno via pins (RX, TX) with GPS data and GPRS data. For the operate voltage could either at 3.3V or 5V, it can be totally compatible to the Arduino. It can be also used to making/answering call, sending/receiving SMS messages and local the position. By the way, SIM GPRS/GSM+GPS Shield V1.0 suppose an SIM card holder at the opposite side. http://juvtmall.com/sim808-btgsmgps-sheild_p0813.html

2.  Method of wiring on multiple layers PCB       Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)     Generally, four layers board can be divide into top layer, bottom layer and two internal layer. Internal layer: by command “DESIGN/LAYER STACK MANAGER” use “ADD PLANE” add “INTERNAL PLANE1” and “INTERNAL PLANE2” as VCC and GND in power and GND layer (tip: don’t use “ADD LAYER”, it will add MIDPLAYER, it’s used in multiple layer of signal track), if there are several power layer such as VCC2 or GND layer such as GND2, then use bolder wire or FILL to draw a district on power of GND belongs to PLANE1 or PLANE2,  use PLACE/SPLIT PLANE to make a corresponding district (VCC2 copper and GND2 copper flakes are not present in this area in the same PLANE) tip: different surface layers in the same PLANE and try not to overlap.SPLIT1 and SPLIT2 are overlappe...

. 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...

6. PCB design related concepts Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  Via  holes: Once selected, be sure to deal with the gap between it and the surrounding each entity especially easy to ignore the gap between the line not connected to via hole of each layer in the middle   and via hole, if it is a automatic wiring, can be in "number Via minimization" (Via Minimiz8tion) in the sub menu select "on" to automatically solve. The larger load flow required, the larger hole size required, such as the larger the hole in the power layer and the other layer. Silk screen layer: For the convenience of installation and maintenance of the circuit, etc., it need s   printing logo and  writing code   on the upper and lower surface of the printing circuit , such as component label and nominal value,   the profile  of   the component and th...