This circuit maintains a constant current output even with different no. of LEDS as load. Useful for various use among other things ex. LED driver you can keep adding LEDs without changing the resistance value, the circuit automatically adjusts. Observe closely what happens to the current through the LEDs as you close/open the LED switches.
Question: What is the best way to change the brightness of the LEDs? What happens if you add more LEDs?
reference: Circuit modified from YouTube w2aew video #190 Transistor Current sources and Mirrors.
MSian 04/2019
