I need to deliver a variable current between 0-2 Amps to a small load (15 Ohms).... At first I was thinking about building a current amplifier..... but after investigating that route again, i think, it's too difficult to build.
Then I heard about adjustable voltage regulators. And looking through the datasheet of an LM117, I noticed it had a curcuit example it called: "Precision Current Limiter" where the output current is controlled by a potentiometer and can be varied from 0 to 1.65 Amps.
I'm not sure if this is a variable constant current source, but it kinda sounds like it to me, is anyone familiar with this circuit?
In the "Precision Current Limiter" circuit the current is controlled by a potentiometer, but I need to control the current with a variable voltage (between 0 - 5 V), is there such a thing as a voltage controlled resistor? So that I could use that in this circuit?
any help is greatly appreciated, thank you Joshua