shamimi
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Current Source with Floating Load
CIRCUIT
CIRCUIT
Getting optimum performance in certain applications requires that some components - sensors, DC motors, transistors - be driven or biased by a constant current. We're mostly familiar with voltage regulators and their ability to maintain a constant voltage under varying current conditions. In this application, your challenge is to provide a constant current regardless of the voltage developed across the load. However, there are errors and voltage limitations to be reckoned with. But once you understand a few simple principles of this circuit, you can avoid the troubled waters.