I have a green laser pointer that runs on 3V (2 AAA batteries). It's rated at 5 mW, but I have no idea if that's exxagerated or not, or if there are any start-up transients when the laser comes on. I would like to power the laser pointer from a 12V source. I assume I just need a resistor in series with the laser pointer to step down the voltage, but I'm not sure. I don't want to guess and use one with too low a resistance, allowing too much current to go to the laser diode and blow it out. How could I determine the correct resistor to use? Or is there another method that's quick and simple?
I have available to me the laser pointer, some wire, a soldering iron, $3.00, a full tank of gas, and a Radio Shack around the corner. Go, McGuyver!
I have available to me the laser pointer, some wire, a soldering iron, $3.00, a full tank of gas, and a Radio Shack around the corner. Go, McGuyver!