Here is another schematic diagram demonstrating exactly the same circuit, connections and components and it looks different but they fall into the same category.
Pictorial design diagrams, or pictorial circuit diagrams are essentially the exact same thing with the identical function, however they use pictures of components within the circuit instead of symbols. Again, here's the identical precise circuit (virtually except a control transformer was inserted and they're utilizing conductors L1 and L3 instead of L1 and L2.
Less clutter, right? I've got enough information in each one these diagrams to know exactly what this circuit does and where to start looking for problems. Hope this helps. ( Note: don't confuse lecture or circuit diagrams together with wiring diagrams; wiring diagrams will typically show images of components such as the pictorial, and the way the whole or part of a circuit has been wired. The distinction is that wiring diagrams generally place an emphasis on real physical location of necessary elements relative to each individual that essentially tell a layman Just What to do concerning the wiring)
A design diagram refers to a particular sort of circuit structure which uses standard electrical/electronic symbols rather than pictures to show the way the circuit (or part of it) functions. Below is a typical 3-wire motor control circuit using a typical momentary stop - start pushbutton station employing a schematic diagram. (Momentary here means the button/switch you trigger will return to its default position once you let go of it, usually by a spring which compels the button/switch to get this done.)
Think of it this way; a circuit diagram is any type of diagram which illustrates the way the circuit functions where the major objective is that the appropriate wiring of elements and their relationship to each other instead of physical location relative to one another or intending prototypes. Nevertheless, in some applications classifying diagrams can be difficult so take this as overall information. I've discovered this is particularly true when dealing with much more complex circuits and electronic equipment. I'm likely to use a more straightforward but typical industrial circuit since these circuit set ups are the exact same, but yet where you're able to see how each kind of diagram shows the role of the circuit in their own ways.
Following is a technical variant of a design diagram. The major intent of this diagram is to demonstrate the logic (referring to electrical control) of a circuit board. This diagram is the one I mostly encounter in my line of work, and it is extremely successful for troubleshooting problems or learning how a circuit functions. Some frequencies are so huge that most types of schematic diagrams need to be read in increments from book form (usually with coded numbers so info can be simpler found). Again, here is the same exact circuit as the first 2, however, considering it in ladder type.