/diy/ - Do It Yourself

>>1743797
based, but consumer product selection isn't really our thing. try >>>/out/ or >>>/g/

>>1743996
he has an LED and he wants to add a resistor and connect the lot to the mains. 98%+ of the voltage will be absorbed across the resistor he's selecting. LED Vf is negligible
it is correct that calculating with peak voltage would build in a nice 41.4% margin without having to think about it, but thinking about is good

>>1743925
what, it's a square wave with pretensions

>>1744014
very very approximately, but there are some extra specializations for below-V- operation, some internal feedback, a minimum closed-loop gain, etc.