I'm looking for a little help with a circuit that has two LM3914 cascaded chips and a photocell to control brightness. My supply is 14.8v DC my input signal is 0.5-4.5v DC and I would like the led current to go from 17ma in the day to 6ma at night.
I built a circuit that works but I set the led current at 19ma but I can't figure out how to change the current on both chips at the same time, let alone how to add a photo cell.
Thanks,
Bob
I built a circuit that works but I set the led current at 19ma but I can't figure out how to change the current on both chips at the same time, let alone how to add a photo cell.
Thanks,
Bob