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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. 

The requirements of wire cloth and wiring   Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  In general, PCB multilayer board wiring is performed according to circuit function. In outer wiring, it is required to have a lot of wiring in the welding surface, and the components are less wiring, which is beneficial to the maintenance and platoon of printing plate. Thin, tight conductor and easily disturbed signal lines, usually arranged in the inner layer. The large area of copper foil should be evenly distributed in the outer layer, which will help to reduce the warping of the plate and make the plating more uniform on the surface. In order to prevent the short circuit between the surface and the printed wire and the mechanical processing, the distance of the conductive graph in the inner and outer layers should be greater than 50mil. Wire direction and line widt...

. 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...

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...

1.The design of PCB Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  In PCB design, the layout of the components and the wiring of the circuit are the two key links. Layout, means the circuit device in the printed circuit board wiring area. Whether the layout is reasonable not only affects the wiring work at the back, but also has an important effect on the performance of the whole circuit board. After guarantee ing  the circuit function and performance index, to satisfy the requirement of process, testing and maintenance aspects, components should be uniform, neat  and compact   on the PCB, as far as possible to reduce and shorten the lead and the connection between components, in order to get symmetrical   packing density . The position of each functional circuit unit is arranged according to the circuit process, the input and output signal, ...