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, scanning rinsing, second reflux rinsing, presoak copper plating, copper plating, scanning rins…
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
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