I need to convert 12v inputs to a 3.3v electric imp005, i have a bunch of TLP521 optocouplers i bought to repair something (i've never used one in a circuit before).
From the data sheet it looks like the recommended forward current for the LED is 16ma at 1.15v so i think i need a 680 ohm resistor to power it from 12v
as for the detector resistor, is this just a pull up to stop the output floating?
does this seem right?
Thanks guys and sorry for the noob question.