A design diagram refers to a specific type of circuit diagram which utilizes standard electrical/electronic symbols rather than pictures to demonstrate how a circuit (or portion of it) works. Below is a normal 3-wire motor controller circuit employing a standard momentary stop - start pushbutton channel employing a schematic diagram. (Momentary this means that the button/switch you activate will return to its default position once you let go of it, usually by a spring which compels the button/switch to do this.)
Here is another schematic diagram demonstrating exactly the identical circuit, connections and components and it appears different but they both fall into the exact same category.
Here's a technical version of a diagram known as a ladder design. The most important purpose of this diagram will be to demonstrate the logic (referring to electrical control) of a circuit board. This diagram is the one I mostly come across in my own line of work, and it's extremely effective for troubleshooting issues or learning the way the circuit functions. Some frequencies are so huge that many types of schematic diagrams need to be read in increments in novel form (typically with coded numbers so info can be simpler located ). Again, here's the same precise circuit as the first two weeks, however, looking at it in ladder form.
Right, much less clutter? I have enough information in each of these diagrams to know precisely what this circuit does and where to start looking for problems. Hope this helps. ( Note: do not confuse lecture or circuit diagrams together with wiring diagrams; wiring diagrams will often show images of components such as the pictorial, and the way the whole or portion of a circuit is wired. The difference is that wiring diagrams generally place an emphasis on real physical location of necessary components relative to each other that basically tell a layman exactly what to do concerning the wiring)
Think of it this way; a circuit diagram is any sort of diagram which illustrates the way the circuit functions where the primary purpose is the appropriate wiring of elements and their connection to each other rather than physical place relative to one another or intending prototypes. However, in some uses Assessing diagrams can be challenging so do this as general advice. I have found this is particularly true when working with much more complicated circuits and electronics. I'm going to work with a simpler but average industrial circuit because these circuit set ups are exactly the same, but yet where it is possible to observe how each type of diagram shows the use of the circuit in their own ways.
Pictorial design diagrams, or pictorial circuit diagrams are essentially the exact same thing with the identical function, however they use images of elements within the circuit rather than symbols. Again, here is the exact precise circuit (almost except a control transformer was inserted and they're utilizing conductors L1 and L3 instead of L1 and L2.