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Current source is defined as any electrical device that delivers or absorbs electric current. A current source gives a constant current, as long as the load connected to the source terminals has sufficiently low impedance. A perfect current source is the one that not only restricts the transfer of energy to short circuit and zero voltage but approaches infinite energy and voltage as the load resistance move towards infinity (an open circuit). A perfect current source has endless output impedance in parallel with the source.As the name suggests constant current source means - the current output will remain constant notwithstanding what the load. But this generally works only for a comparatively narrow range of loads. Thevenin's Theorem emphasize that regardless of how complex a circuit may appear to be, it can be curtailed to a single source of EMF, such as a single resistance, a single capacitance and/or a single inductor. To be frankly speaking all this is not only true according to the principle, but also works absolutely amazing with some of the very complex circuitry in use nowadays. The idea came into origin and later further developed when circuits were hand built rather that printed on silicon chips.Nowadays, constant current sources offer a steady output current independent of the load and input power line with variations. Usage of these constant sources consist of producing magnetic fields, evaluating and qualifying products like circuit breakers, relays, transformers, meters, etc.Usually the output frequency of constant current sources is fixed and defaulted at 60Hz but some online stores even offer output frequencies within the 40Hz to 4KHz range on request. The waveforms, such as Square wave, Triangle wave, or Saw wave are available online. Just browse through the site and choose the one that best fits your requirement and simply place the order. Article Tags: Constant Current Source, Constant Current, Current Source
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