/diy/ - Do It Yourself

>>1468320
Pic related shows a basic buck converter modified to constant current output
the same general idea applies to a boost module or any other four-terminal regulator: send the LED's - power return through a resistor chosen to drop the specified feedback voltage at the desired current (caution, if working from a limited stock you may need to connect multiple resistors in series and/or parallel to dissipate power)
for the LM317 solution, the wasted heat will "only" be 1-2W. in this case, the average buck module won't be much better because of the high specified feedback voltage
you need to understand that electronics is not an "I have junk, what do?" craft. a starter kit is not going to get you everywhere

>>1468647
did you try a larger resistor?
and open drain means you pull the output UP

>>1468647
I don't see the physics being favorable for that level of integration, except at the micropower level. caps are still hella expensive to put on a chip

>>1468673
>with an op-amp or something
just a resistor. Pic related