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You can see that there are various bits represented by symbols, all connected in various ways. Let’s look at some of the big picture concepts: Left to Right: The first thing to notice is that you read the schematic left-to-right: the input on the left feeds the signal through parts and pathways in the middle to an output on the right. This left-to-right convention is not universal, but it is probably the most common layout for a schematic. Power and Ground: The top area of the schematic shows some type of power (in our case, 9 volts Direct Current, the same thing that comes out of a 9 volt battery).
The bottom of the schematic shows grounds. This directly maps to the physical arrangement of our power source, again, a 9 volt battery. The top of the schematic is showing the positive (+) voltage, and ground represents the negative (-) side. Each symbol shows a part number and a part value or type. Connections: The connections between components are shown by lines. Inputs and Outputs Power. DIY Electronics.