hello : )
i have a 5v logic signal and wish to trigger an opto-isolator with it . i have tried an on-line calculator for working out a resistor, but need expert help to be sure.
Opto-isolator is a: dual HCPL2731 DIP8
ratings from the data sheet
Input Forward Voltage 1.4v(typical) - 1.7v(max)
i think it says 12ma input max? ( so i've gone for 8ma)
the data sheet is hereHCPL2731 Datasheet pdf - Dual Channel Low Input Current, High Gain Optocouplers - Agilent (Hewlett-Packard)
i worked it out to be 470 Ohm resistor if the desired current be 8ma.
but i could be totally wrong about the 8ma.
thanks for any help. : )
i have a 5v logic signal and wish to trigger an opto-isolator with it . i have tried an on-line calculator for working out a resistor, but need expert help to be sure.
Opto-isolator is a: dual HCPL2731 DIP8
ratings from the data sheet
Input Forward Voltage 1.4v(typical) - 1.7v(max)
i think it says 12ma input max? ( so i've gone for 8ma)
the data sheet is hereHCPL2731 Datasheet pdf - Dual Channel Low Input Current, High Gain Optocouplers - Agilent (Hewlett-Packard)
i worked it out to be 470 Ohm resistor if the desired current be 8ma.
but i could be totally wrong about the 8ma.
thanks for any help. : )