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All electronic circuits from the simplest to the most complex design need diagrams to be used as reference in designing, modifying, and troubleshooting the circuit.
The most common graphical languages used in the illustration of components in circuits and wiring systems are;
block ,
schematic,
wiring, and
pictorial diagrams.
Each one of these diagrams has its own unique characteristics in presenting the circuit.
PICTORIAL DIAGRAM
It shows the pictures of the actual components and wiring connections although it does not provide the exact size of components. It shows exact shape in proportion to the actual component or device.
BLOCK DIAGRAM
This form usually uses block of squares, rectangles or triangles to represent components, group of components or units of equivalent. Block diagrams are particularly used to represent internal components of an integrated circuit.
SCHEMATIC DIAGRAM
It shows the components used in their interconnection. Each graphic symbol is also accompanied with a reference designation to distinguish it from other similar symbols. It does not illustrate the physical size, shape or chassis location of the component parts and devices.
WIRING DIAGRAM
It shows wiring connection in a simplified, easy to follow manner. It may show either internal or external connections or both and is usually drawn as simple as possible to trace out the connection of a circuit. The components of the circuit are identified by name or are represented by means of pictorial illustrations that do not follow any welldefined standard form.
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