Karl and Corey discuss the operation of an Adjustable Constant Current Dummy Load.
Corey and I were trying something different with this episode.
I am not sure how clear the information will actually come across.
It is pretty hard to describe a circuit’s operation just using audio.
Please let us know if you learned something or if this came across as a jumbled mess.
Also, please feel free to ask questions.
I tried to create a shareable online simulation of this circuit.
I tried all of the online tools I could find. They were all a disaster except for CircuitLab.
CircuitLab does not have a free version, so I could not save and share the simulation.
Next best thing is a simple schematic of the circuit.
Thank you Upverter for having a free, useable version.
You could simplify the circuit further by using one voltage source to power both the OpAmp and set the requested current.
I did not want to do that because you typically need to power the OpAmp with a higher voltage then the voltage you use to set the current.
The reason for that is noted on the schematic, but I’ll repeat it here for clarity: You need to make sure the OpAmp has the ability to drive it’s output high enough to turn on the FET.
Note: You could always swap out that potentiometer for a DAC. That way you could control the amount of current using a microcontroller.
It spawned numerous copies and iterations of the design Dave presented.
The original design:
Hackaday article about the original design:
EEVblog Inspired Dummy Load #1:
EEVblog Inspired Dummy Load #2:
Slightly updated version:
I don’t care for instructables normally but this one is pretty dood:
Best name ever? Nice, simple design though.