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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 th...

2. The design of PCB-- Layout inspection and the main sequence 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....

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 ea...

2. Let's talk about PCB--- Printed circuit board                                             Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)      A  printed circuit board  ( PCB ) mechanically supports and electrically connects electronic     components using conductive tracks, pads and other features etched from copper sheets laminated onto a non-conductivesubstrate. Components (e.g. capacitors, resistors or active devices) are generally soldered on the PCB. Advanced PCBs may contain components embedded in the substrate. PCBs can be  single sided  (one copper layer),  double sided  (two copper layers) or  multi-layer  (outer and inner layers)....

1 . Let's talk about PCB--- PCB's History        Juvtmall  ( a company supply PCB Prototyping , PCBA service  and sell kinds of components, modules  and so on) Development of the methods used in modern printed circuit boards started early in the 20th century. In 1903, a German inventor, Albert Hanson, described flat foil conductors laminated to an insulating board, in multiple layers. Thomas Edison experimented with chemical methods of plating conductors onto linen paper in 1904. Arthur Berry in 1913 patented a print-and-etch method in the UK, and in the United States Max Schoop obtained a patent to flame-spray metal onto a board through a patterned mask. Charles Ducas in 1927 patented a method of electroplating circuit patterns.                                                         ...

5. A rduino   learning notebook  -  Buzzer Experiment             Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  ( Catduino has the same function of Arduino) Querying on the Internet found that t he voltage is 5V , the same as   the  output voltage of the digital port  for  the arduino control panel, so  the  resistance is  not  required.  It c an  be used directly. Let's start with a brief introduction of this small buzzer. Small buzzer, because of its small size (6 mm in diameter), light weight, low price, stable structure, it is widely used in various kinds of electrical equipment needed sound , electronic production and MCU ,circuit, etc.The buzzer is divided into active buzzers and passive buzzers. The following figure is the active buzzer   The following ...