Here is a specialized version of a diagram. The principle intention of this diagram is to demonstrate the logic (referring to electric control) of a circuit. This really is the one that I mostly come across in my own line of work, and it's very successful for troubleshooting issues or learning the way the circuit works. Some frequencies are so enormous that many types of schematic diagrams need to be read in increments in book form (typically with coded numbers so info can be easier found). Again, here is the same exact circuit because the first two, however, looking at it in ladder type.
A design diagram refers to a specific type of circuit design which utilizes standard electrical/electronic symbols instead of images to demonstrate the way the circuit (or portion of it) works. Below is a typical 3-wire motor controller circuit using a standard short stop stop - start pushbutton station utilizing a schematic diagram. (Momentary here means that the button/switch you trigger will return to its default location once you physically let go of this, usually by a spring which forces the button/switch to get this done.)
Here is another schematic diagram showing the same circuit, connections and components and it appears different but they fall into the same category.
Right, less clutter? I have enough info in each one of these diagrams to know just what this circuit will do and where to search for issues. Hope this helps. ( Note: do not confuse lecture or circuit diagrams together with wiring diagrams; wiring diagrams will typically show pictures of components like the pictorial, and also the way the whole or portion of a circuit is wired. The difference is that wiring diagrams usually put an emphasis on actual physical place of necessary elements relative to each other that basically tell a layman Just What to do concerning the wiring. )
Pictorial design diagrams, or graphic circuit diagrams are essentially the identical thing with exactly the exact identical function, however they use images of components inside the circuit rather than symbols. Again, here is the exact identical precise circuit (virtually except a controller was added and they're using conductors L1 and L3 rather than L1 and L2.
Think of it in this way; a circuit structure is any type of diagram that illustrates how a circuit operates where the main goal is the proper wiring of elements and their connection to each other instead of physical place relative to one another or intending prototypes. However, in some uses classifying diagrams can be challenging so choose this as general information. I've discovered this is particularly true when dealing with much more complex circuits and electronics. I'm likely to use a simpler but typical industrial circuit since these circuit setups are exactly the same, but where it is possible to observe how each type of diagram shows the use of the circuit in their own manners.