I'm looking to use an LED in a control application. (feedback via LED to photodiode.)
I found a few questions that didn't fit.
I'd like to make it all linear, no PWM.
(I worry about the led turn on/off time with PWM, I can average, but that's slower. Even with pwm having a linear 'current' control knob might help.)
What frequency you ask?; I guess 1-10 MHz, for a start, but faster is better. :) I dream of finding an LED whose light output (in mW) is linear with current, from say 1 uA to 1 mA. Is there some search phrase I can look for? Searching for leds on the web is a fire house. I know this is kinda a shopping question, Is there a meta-shopping type question? How to shop?
Let me edit: Yes a linear opto-coupler would be even better. If it was fast. > 1MHz.