Optocoupler Series Resistor at henrymfostero blog

Optocoupler Series Resistor.on the input side of the optocoupler, a series resistor, ri, is required to be connected to the anode to limit the current that flows. But 100 ohms would deliver 43ma which is close.

PC817 Optocoupler Datasheet, Pinout, Circuits, Arduino Examples Easybom
from www.easybom.com

how do you choose the series resistor value for the led side of an optocoupler. according to the data sheet with if=1ma minimum ctr is 34%. But 100 ohms would deliver 43ma which is close.

PC817 Optocoupler Datasheet, Pinout, Circuits, Arduino Examples Easybom

Optocoupler Series Resistor After all you just want to ensure.peter bennett made a good point in the comments below about the resistor power rating, make sure it is appropriately sized. how do you choose the series resistor value for the led side of an optocoupler. according to the data sheet with if=1ma minimum ctr is 34%.