UroBoros
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opto 4n35
hai
I am using an optocoupler 4N35 for output AC voltage comparison for a UPS using PIC16F72,
Opto LED is driven directly from AC with a bridge and a dropping resistor and a filter capacitor. The transistor side of Opto is driven from 5 volts with a 5k trimpot to gnd.
The center of trimpot to ADC input of PIC.
My problem is that the proper lenier operation of OPTO seems to be different for different parts. By changing the input dropping resistor value of the input side I have to make differnt settings for each opto I am trying for each unit.
Is this optocoupler is not suitable for this purpose? Is this opto intented only for switching ? or is there any other possibilities ? Or any tricks applicable?
Thanks
Picstudent
hai
I am using an optocoupler 4N35 for output AC voltage comparison for a UPS using PIC16F72,
Opto LED is driven directly from AC with a bridge and a dropping resistor and a filter capacitor. The transistor side of Opto is driven from 5 volts with a 5k trimpot to gnd.
The center of trimpot to ADC input of PIC.
My problem is that the proper lenier operation of OPTO seems to be different for different parts. By changing the input dropping resistor value of the input side I have to make differnt settings for each opto I am trying for each unit.
Is this optocoupler is not suitable for this purpose? Is this opto intented only for switching ? or is there any other possibilities ? Or any tricks applicable?
Thanks
Picstudent
