I'm trying to supply power to strings of LED lights for emergency lighting purposes with a 12v car battery. With the 12v supply I figured I could get 3 sets going at the same time.
The power supply that comes with them says:
INPUT: 120V-60HZ,0.06A - OUTPUT: 3.5 =-=-= 0.45A
For using DC only with a battery, I figured that a simple voltage divider would work. So in trying to determine the best value for the resistors in the divider I tried taking a resistance reading on the string of LEDs. I am unable to get a reading and at the 200ohms range setting, the meter is actually lighting the LEDs.
Here's what else I know:
The actual voltage coming out of the power adapter is 4.3v without the LEDs connected and only 3.2v with them connected. The resistance of the DC side of the adapter is 430 ohms.
So, am I right in assuming the following circuit would work?