The chief executive of ChatGPT-owner OpenAI says it is "not for sale" after a $97.4bn (£78.4bn) takeover bid from a ...

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.

To make things even more even there’s a slew of constant current LED driver chips out there that can be had for a song. But do you have any idea how those constant current circuits work?