A FET constant current source is a type of active circuit that uses a field-effect transistor to supply a constant amount of current to a circuit. Constant current sources and current sinks (the ...

Simple 100mA Constant Current Source using Transistor. In this project, we will build a simple transistor constant current source generator using only 4 components. It is a very inexpensive circuit ...

In this way is achieved a stabilizing effect that provides current that is constant through the LED. Value of R is equal to the LED’s current divided by 0.5. R (Ω) = I (mA)/0.5. The power dissipation ...

If you extend the tester to handle more LEDs, you must add another Zener diode for each LED position. The test current that ? ows through the LEDs is held reasonably constant by FET T1, independent of ...

Circuit Diagram and Explanation: The circuit Diagram of the high power LED driver is shown in the image below. As you can see the driver has nothing more than a LM317 IC and a resistor. The above ...

The design of a 3W constant current LED driver based on flyback structure with primary side control technology is proposed, which eliminates the opto-isolated feedback and secondary regulation ...

Continue reading “LED Tutorial Demystifies Several Control Techniques” → Posted in LED Hacks Tagged constant current , driver , mosfet , transistor Posts navigation ...

A primary side control LED driver with a novel constant current control mechanism is proposed in this paper. In order to simplify the peripheral circuits, the proposed driver employs two cascaded ...