Schematic and single-line diagrams should be arranged so that signal or transmission path from input to output proceeds in this fashion:

Terminals or leads are frequently identified by colors or symbols, which should be indicated on the diagram.

On typical electronic diagrams, these items need not be shown unless they are needed for clarification:

Connecting lines for conductors are typically drawn horizontally or vertically to minimize bends and crossovers.

Switches and relays should be shown in this position with no operating force or applied energy:

These items typically are not used in new designs, but are still common in high-power amplifiers:

Interrupted paths are not an acceptable method of simplifying a diagram.

When arranging symbols, it is typically not necessary to leave blank spaces adjacent to symbols to allow for reference designations and notes.

This type of circuit is a semiconductor wafer or chip:

Printed circuit boards are widely used and replace hand-wiring methods.

On electronic diagrams, you should indicate grouped components by using dashed lines to enclose them in a box.

On electronic diagrams, it is typically not necessary to identify each separately replaceable part.

Symbols should conform to an internationally or nationally approved standard.

For clarity, draw sections of multi-element parts separately in a schematic.

CAD component layout programs allow you to create the best possible parts placement.