Block diagrams use very basic geometric shapes: boxes and circles. The principal parts and functions are represented by blocks connected by straight and segmented lines illustrating relationships.
When block diagrams are used in electrical engineering, the arrows connecting components represent the direction of signal flow through the system.
Whatever any specific block represents should be written on the inside of that block.
A block diagram can also be drawn in increasing detail if analysis requires it. Feel free to add as little or as much detail as you want using more specific electrical schematic symbols.
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