Pictorial design diagrams, or pictorial circuit diagrams are basically the exact identical thing with exactly the identical purpose, however they use pictures of components within the circuit instead of symbols. Again, here's the identical precise circuit (almost except a control transformer was added and they are using conductors L1 and L3 rather than L1 and L2.
Consider it this way; a circuit diagram is any kind of diagram that demonstrates the way the circuit functions where the main purpose is that the proper wiring of components and their connection to each other instead of physical place relative to one another or planning prototypes. Nevertheless, in some applications classifying diagrams can be hard so choose this as general advice. I've found this is particularly true when working with more complicated circuits and electronics. I'm going to use a simpler but average industrial circuit since these circuit setups are exactly the same, but where it is possible to observe how each kind of diagram shows the purpose of the circuit in their own ways.
Much less clutter? I've got enough info in every one these diagrams to know just what this circuit will do 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 pictures of elements like the pictorial, and also how the entire or portion of a circuit will be wired. The difference is that wiring diagrams usually place an emphasis on actual physical place of necessary elements relative to each individual that essentially tell a layman exactly what to do about the wiring)
A schematic diagram refers to a particular sort of circuit design that uses standard electrical/electronic symbols rather than images to show how a circuit (or a portion of it) works. Below is a typical 3-wire motor control circuit using a standard momentary stop - start pushbutton station employing a schematic diagram. (Momentary this means the button/switch you activate will go back to its default location once you physically let go of it, typically by a spring which forces the button/switch to get this done.)
Here is a version of a diagram. The principle intention of this diagram is to demonstrate the logic (referring to electric management ) of a circuit board. This really is the one I mainly encounter in my line of work, and it is extremely successful for troubleshooting problems or learning the way the circuit works. Some circuits are so enormous that most types of schematic diagrams need to be recorded in increments from novel form (normally with coded numbers so that info can be simpler located ). Again, here is the exact specific circuit since the first two, but looking at it in ladder type.
Here is another schematic diagram showing exactly the same circuit, connections and components and it looks different but they both fall into exactly the identical category.