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 ...

This configuration applies to both high-side and low-side current sources. The high-side current source of Figure 1 feeds RLOAD with a constant current, I = 1.5V/ROUT. The positive linear regulator ...

Most of us are used to thinking in terms of voltage sources so there is rarely a day goes by that we do not think about voltage source loading or use Thevenin’s theorem. But what about current ...

In his video [Afroman] describes how the LM317 can be used to regulate current rather than voltage to provide a constant current source under varying load.

Normally, for constant voltage operation, the output is connected – either directly or via a resistive divider – back to the feedback input (pin 4) of IC1. In this circuit, however, Q1 senses the ...

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 ...

The ever innovative and prolific Mr. Woodward has offered “PWM-programmed LM317 constant current source,” an intriguing programmable constant current source which elicited a lively conversation in its ...

A Current Source IC. The LT3092 datasheet indicates that the IC can dissipate a maximum of about 1 W of power. It also shows a basic circuit (Figure 1) to configure the chip as a constant current ...

Figure 1’s negative constant current source has been a textbook application for the LM337 regulator forever (or thereabouts). It precisely maintains a constant output current (Iout) by forcing the ...

A current source provides electrical energy with a constant current. The implication is that if the resistance of the load changes the current source will vary the voltage to compensate. In ...