Saturday 3 January 2015

optoelectronics - How is optimum series resistor of an optocoupler sized?


I want to learn how to size the series resistor for this optocoupler which has a high CTR.


I will use Arduino's 5V digital output pins for eight of this coupler so I really want to source necessary enough current from each pin.



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What is the method to calculate the optimum like series resistor(R1 above) in this case?




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