A "Dark-on" opto-isolator that is normally conducting when the LED is turned off
127509
reverse function optocoupler
84971
Photoelectric effect, low frequency light
27616
Make Object emit light & be reconizable
111506
Is it possible for light sources in Cycles to have nonphysical falloff like in BI?
16242
How do two-leaded color changing LEDs work?
118920
A switch that is only ON if the reference voltage is matched -+ 0.1 volts
93892
Why does a neon lamp indicator on a power strip switch flicker in the dark?
86023
LED lamp keeps glowing when dimmer is turned off
51708
Why do LEDs not obey Ohm's law?
46538
How long would a 150 Farad Capacitor light up an LED
54835
Why does a resistor need to be on the anode of an LED?
134328
What are the 'knuckles' on through-hole LEDs and photodiodes for?
134911
changing the intensity falloff of light sources using Cycles nodes
78560
Why is a dark-room safelight safe?
14302
How does the current limiting resistor for an LED affect current and voltage drops?
123900
How do I design a circuit for a bi-color led to display power?
43715
Reverse polarity protection