They have none of the special skills you’d find in tunnel, Gunn, varicap, Zener, and avalanche diodes, or even LEDs, instead ... them to generate a stable voltage drop because they have ...

Then knowing he needed 4 mA to power each LED for backlighting he used some 1978 vintage current limiting diodes designed to pass 2mA each regardless of voltage source, within limits of course.

How a Simple LED Resistor Calculator is Helping DIYers and Engineers Save Time March 22, 2025 by David Edwards Time will ...