A design diagram refers to a specific kind of circuit structure which utilizes standard electrical/electronic symbols instead of pictures to demonstrate how a circuit (or a portion of it) functions. Below is a standard 3-wire motor control circuit using a normal momentary halt - start pushbutton channel employing a schematic diagram. (Momentary this means that the button/switch you trigger will go back to its default place once you let go of this, usually by a spring which compels the button/switch to do this.)
Here is another schematic diagram demonstrating precisely the identical circuit, components and connections and it seems different but they fall into the exact identical category.
Pictorial design diagrams, or graphic circuit diagrams are essentially the identical thing with the exact same purpose, however they use pictures of elements within the circuit rather than symbols. Again, here's the exact exact circuit (virtually except a controller was included and they're utilizing conductors L1 and L3 rather than L1 and L2.
Think of it this way; a circuit diagram is any type of diagram which demonstrates how a circuit operates where the major goal is that the proper wiring of elements and their connection to each other rather than physical location relative to each other or planning prototypes. Nonetheless, in some applications classifying diagrams can be difficult so choose this as overall information. I've discovered this is particularly true when working with more complicated circuits and electronics. I'm likely to work with a more straightforward but typical industrial circuit because these circuit setups are the exact same, but yet where you're able to observe how each sort of diagram shows the purpose of the circuit in their own ways.
Following is a specialized version of a diagram called a ladder structure. The principle purpose of this diagram will be to show the logic (referring to electric control) of a circuit board. This really is the one that I mostly come across in my line of work, and it's extremely successful for troubleshooting problems or learning the way the circuit works. Some circuits are so enormous that most types of schematic diagrams have to be read in increments from novel form (usually with coded numbers so that information can be simpler found). Again, here is the exact exact circuit because the first 2, but considering it in ladder type.
Less mess? I've got enough information in each one of these diagrams to know just what this circuit does and where to look for issues. Hope that this helps. ( Note: do not confuse circuit or schematic diagrams together with wiring diagrams; wiring diagrams will usually demonstrate pictures of elements like the pictorial, and also the way the whole or part of a circuit has been wired. The distinction is that wiring diagrams usually place an emphasis on actual physical place of necessary components relative to each other that essentially tell a layman exactly what to do concerning the wiring. )