![]() It will provide a steady current even if there are changes in load resistance. It will also have a potentiometer to control the current output from 1 to 100mA range. It is a very inexpensive circuit that can provide 100mA constant current source using a 5V power supply. In this project, we will build a simple transistor constant current source generator using only 4 components. Simple 100mA Constant Current Source using Transistor So this is where Constant current circuits are required, other example can be constant current LED driver circuit where current though an LED has to be constant. In case where your battery is 10.5V if you connect it to a 1A 12V battery charger, your output current from charger will always be 1A but the output voltage will be varied to maintain this 1A charging current. An example for this will be 12V battery charger in CC mode where charging current will be fixed by voltage will be varied. In CC mode, an ideal current source power supply makes the output current constant and varies the output voltage as required by the load resistance. If you connect a small led it will draw less current and if you connect a bigger one it will draw more current but the voltage across the LED will always be 5V. The best example will be your 5V USB port, where the output voltage is fixed at 5V but based on the load the current will vary. 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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