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PCB and PCBA A PCB (Printed Circuit Board) is a board that electrically connects electronic components using conductive traces, pads, and other features etched from copper foil laminated onto a non-conductive substrate. PCB’s can be  single sided  (one copper layer),  double sided  (two copper layers), or  multi-layer  (outer and inner layers). Conductors on different layers are connected with vias (plated-thru. holes). Multi-layer PCB’s allow for much higher component density and design complexity. PCBA (Printed Circuit Board Assembly) is the board obtained after all printing solder paste on the PCB and then mounting various components like resistors, ICs (Integrated Circuits), capacitors and any other components  like transformers depending on the application and desired characteristics of the board. A PCBA usually undergoes reflow furnace heating to establish a mechanical connection between the PCB and the components.

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...

Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  Motor shield  is a platform for robotics and mechanical applications based on L298P. It can be used to drive double DC motor or a 4-wire stepper. When controlling double DC motor, there are Only 4 control pins are used, which makes more easily to control, and saves the control pins for controller. The Drive current can be up to 2A per motor output for the adding of the heat sink. Measure the driver current by the additional resistance, makes the system more smartly. 

RMF69 Shield-433MHz contains a FSK wireless module, it has the same function that radio frequency transmitter owns, such as receiving and transmitting message. RMF69 Shield-433MHz can totally compatible to Arduino. Features Low consumption More professional ISM band Frequent range from 140 to 960MHz  Totally compatible to Arduino http://juvtmall.com/rfm69-shiled_p0808.html

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

  Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  Here, you can know the details:  http://juvtmall.com/simduino_p0814.html Contact me: ann@juvtmall.com

Multiple Layer Board   Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  PCB Multilayer Board means multilayer board used in electrical product, it involves wild area, such as home appliance, computer accessories, communication, toy, instrument, LED and so on. PCB(printed circuit board) Multilayer Board is consist of track on several layer of insulation substrate and pad, it has two function: conduct every layer ’ s circuit, insult mutual layer. As the develop of SMT, the launch of new SMD (such as QFP, QFN, CSP, BGA), electrical product become more intelligent and smaller. Since HDI is created, the develop these process technology lead the design of PCB to multiple layer, and high density.   1 . Process of multilayer board   1. PCB which has draw the track: Put on the board, acidity deoiling, scanning rinsing, second reflux rinsing, micro etch, ...

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...