Circuit diagram

The presentation of the interconnections between circuit components in the schematic diagram does not necessarily correspond to the physical arrangements in the finished device.

A common, hybrid style of drawing combines the T-junction crossovers with "dot" connections and the wire "jump" semi-circle symbols for insulated crossings.

[3][7] On a circuit diagram, the symbols for components are labelled with a descriptor or reference designator matching that on the list of parts.

It is a usual (although not universal) convention that schematic drawings are organized on the page from left to right and top to bottom in the same sequence as the flow of the main signal or power path.

For example, a schematic for a radio receiver might start with the antenna input at the left of the page and end with the loudspeaker at the right.

More complex devices have multi-page schematics and must rely on cross-reference symbols to show the flow of signals between the different sheets of the drawing.

Detailed rules for the preparation of circuit diagrams, and other document types used in electrotechnology, are provided in the international standard IEC 61082-1.

The EDA tools arrange and rearrange the placement of components and find paths for tracks to connect various nodes.

[9] A generalized design flow may be as follows: Teaching about the functioning of electrical circuits is often on primary and secondary school curricula.

Comparison of pictorial and schematic styles of circuit diagrams
Common schematic diagram symbols (US symbols)
The circuit diagram for a four-bit TTL counter, a type of state machine
Wire crossover symbols for circuit diagrams. The CAD symbol for insulated crossing wires is the same as the older, non-CAD symbol for non-insulated crossing wires. To avoid confusion, the wire "jump" (semi-circle) symbol for insulated wires in non-CAD schematics is recommended (as opposed to using the CAD-style symbol for no connection), so as to avoid confusion with the original, older style symbol, which means the exact opposite. The newer, recommended style for 4-way wire connections in both CAD and non-CAD schematics is to stagger the joining wires into T-junctions. [ 3 ]
A rat's nest