![]() The circuit "ground" is also connected to the chassis, so the entire metal enclosure will be at "ground potential", which offers some shielding from radio-frequency and other electromagnetic interference.īelow are the commonly used schematic symbols for ground. This wire is connected to the chassis for safety reasons. There is also a "safety ground", which is the "third" or "green" wire of the AC mains (at least, in the United States, that is). Normally, ground is chosen as the common return point for all power supplies and circuits, and for the "shield" connection of the input and output jacks. For instance, if you decided to make the +400VDC supply "ground", then the connection at the other side of the power supply would be at -400V with respect to "ground". That is, you could choose any point in the circuit to be "ground" and reference all other voltages to that point. "Ground" means a common reference point or potential voltage, assumed to be "zero volts". ![]() What is "ground"? If you read only a little about amplifier circuits, you will soon encounter the term "ground", or "earth".
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