Hi Klaus,
Voltage range I have is from 5V to 28V, but just to keep it simple I have plan to use +12V (I can be flexible with voltage range). LED Connection type is Common Anode.
Current for Day Mode, Red LED = 10.6 ± 0.9 mA (LED Drop Vf = 2V @14mA)
Current for Night Mode, Red LED = 1 ± 0.1 mA (LED Drop Vf = 1.6V @0.1mA)
Current for Day Mode, Green LED = 11.05 ± 0.05 mA (LED Drop Vf = 3.1V @14mA)
Current for Night Mode, Green LED = 0.1 ± 0.01 mA (LED Drop Vf = 2.7V @0.1mA)
Controlling DC Current look simple as my circuit is simple and does not have microcontrollers (I have restriction to use microcontroller in my application).
I have plan to use Two ULN2803 with an N-Channel MOSFET to drive Enable/Disable corresponding to Day/Night Mode. And Yes, Two Series Resistor for each LED will help for Low and high current in turn connected to each ULN ICs.
Di
Can you please recommend some circuit for above requirement also some supporting article for adjustable common anode voltage ?