This is a very simple led constant current design using only 2 transistors, 2 resistors and an LED. This circuit allows you to use any voltage between 2V and 24V to drive almost any type of LED with ...

There’s an old application note about using JFETs as a constant-current source. That article says you can achieve better regulation by putting a resistor in the source leg of the circuit (Fig. 2a) .

If you ever work with a circuit that controls a decent amount of current, you will often encounter a FET – a Field-Effect Transistor. Whether you want to control a couple of powerful LEDs, sw… ...

By using dual bipolar devices in one case, the manufacturer nearly perfectly matches the two devices. Although this Design Idea describes a positive power supply, you can realize a similar ...

2. A better approach is to use a FET as a constant-current source. The IXTP3N50D2 Dmode FET from IXYS Corp. powers a 5-W white VLED such as the LZI-00NW05 from LEDengin (190 lumens at 1 A); the ...

Switching to 24V of pwm (right) shows a continued clean even-height current waveform both constant-current circuits. Above 24V the transistor is having to handle a fair amount of power – “wet finger ...

The normal constant current circuit, one with the same transistor in the reversed-collector-emitter configuration, and then the right one with the first circuit completely reverse-biased. The 500Ω ...

First Transistor Using Nanotechnology Is 50 Times More Energy Efficient Than Current Models. ScienceDaily . Retrieved June 4, 2025 from www.sciencedaily.com / releases / 2008 / 04 / 080424212327.htm ...