Constant Current Regulator Circuit - Quick, Dirty, and CHEAP!

Someone was just asking me about my old videos on constant current regulators and thought I'd expand on those with a much cheaper and simpler circuit. I think this is perfect for most LED applications if this is what you're looking to do. Of course, you can always regulate down the voltage to a known level, then drive LEDs with a current limiting resistor... but then, all LED current goes through the voltage regulator... and the larger that regulator has to be, the more expensive things get... lots more things to consider as well, but just throwing this out there for consideration!

Here's that link to the simulation:

Those videos I made previously:
Using TLV431

and heavy loads:



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