In CV mode, the power supply makes the output voltage constant and changes the output current as required by the load resistance. Normally when a power supply unit drives a load there can be two possible modes of operation, one is by Constant Voltage (CV) mode of operation, and the other by Constant Current (CC) mode operation. The circuit used in this tutorial will be able to able to deliver a constant current of 100mA to your load but you can modify it using a potentiometer as per your design requirements.

In this tutorial we will find answers to these questions and we will also build and test a simple Constant current source circuit using transistor. So what is meant by current source? How will it work and why is it needed? And many circuits, especially the one involving Op-Amp or switching circuits would require you to use a constant current source to make the design work. While anything that provides a constant voltage like a simple 5V USB output or a 12V adapter can be considered as a voltage source, the term current source always seems to remain a mystery. Many of us who have worked with Analog circuits would have often come across the terms voltage source and current source in a circuit design.

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