A current source is an electronic circuit that delivers or absorbs an electric current which is independent of the voltage across it. A current source is the dual of a voltage source. The term constant-current sink is sometimes used for sources fed from a negative voltage supply. Figure 1 shows the schematic symbol for an ideal current source, driving a resistor load. There are two types. An independent current source sources or sinks a constant current. A dependent current source delivers a current which is proportional to some other voltage or current in the circuit.
Read more about Current Source: Background, Current and Voltage Source Comparison
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