What is the meaning of different type of grounds in electronic circuits? Can we use any ground in any circuit or not?
Answer
They represent different ground types.
The first is "circuit ground" and is a reference point in the circuit against which all voltages are measured.
The second is chassis ground and represents a connection to the metal enclosure the circuit is in.
The third represents earth ground and is a physical connection to the ground under your feet.
3 is often used in place of 1 though.
Also you sometimes get various different combinations of the three representing different ground zones in a circuit (digital ground, analog ground, power ground, etc) at the designer's discretion.
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