1.PCB layout design of the design, from the beginning to determine the size of the board, printed circuit board the size of the shell due to chassis size limit, just to be safe into the enclosure is appropriate, and secondly, should consider the printed circuit board and external components (mainly potentiometer, jack, or other printed circuit board) is connected. Printed circuit board and external components are generally isolated by plastic or metal wire cable. But sometimes designed socket form. Namely: the installation of a device plug-in printed circuit board socket set aside as the contact position.
　　Installed in the PCB layout design for the larger components, to add metal attachment fixed to improve the resistance to vibration and impact resistance.
　　(2) design of the basic method of wiring diagram
　　First, the selection of components required for a variety of devices and socket specifications, dimensions, area, which are fully understood; placement of the various components of a reasonable, careful consideration, mainly from the electromagnetic compatibility, interference point of view, traces short, cross-less, power, ground path and decoupling and other considerations. Location of the components set, the various components of the line is, according to the pin connection diagram to complete a variety of methods, design of printed circuit diagram of computer-aided design and manual design method two.
　　The most original is hand-arranged layout. This takes more time, often repeated several times to finalize, which no other equipment can also be drawing, hand-arranged layout of this method are just learning PCB layout design is also helpful. Computer-aided drawing, there are a variety of graphics software, different functions, but in general, to draw, modify, more convenient and can save storage and printing.