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,.....
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http://en.wikipedia.org/wiki/Current_source
transistor output configured in such a way that the load is wired from the output of the sensor to the common side of the power source so that when the transistor turns on voltage is sourced to the load.
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http://www.empiremagnetics.com/glossary/glossary.htm#A
This refers to a sensor output configuration which provides a source of current to the load. Since the current passes through the circuit to the load, it is said to ‘source` the current to the load. See also: Current, Current Sink.
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https://www.encyclo.co.uk/local/20687
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