1.PCB layout kind of the look, PCB assembly processing in the first place to ascertain the size of the board, pcb the actual size of the shell attributable to chassis size limit, simply to be safe inside the enclosure meets your needs, and secondly, must evaluate the pcb and external components (mainly potentiometer, jack, or some other printed circuit board) is connected. Pcb and external components happen to be isolated by plastic or metal wire cable. But sometimes designed socket form. Namely: installing a machine plug-in pcb socket make time for as the contact position.
Inside the middle of the PCB layout design for ones larger components, PCB design to metal attachment fixed to rectify the ability vibration and impact resistance.
(2) sort of comprise procedure for wiring diagram
First, selecting components necessary different devices and socket specifications, dimensions, area, which will be fully understood; placement of the various components of a typical reasonable, consideration, mainly out from the electromagnetic compatibility, interference point of view, traces short, cross-less, power, ground path and decoupling in addition to other considerations. Location in the components set, the various for this lines are, per irs pin connection diagram to attempt lots of methods, way of printed circuit diagram of computer-aided design and manual design method two.
Among the most original is hand-arranged layout. This takes a lot more, often repeated a few times to finalize, which few others equipment is additionally drawing, hand-arranged layout of method are simply learning PCB layout design is always helpful. Computer-aided drawing,  multilayer PCB design there are lots of graphics software, different functions, using general, to get, modify, more convenient all of which will save storage and printing.