I entail to know what giving of resistor to use on a 5mW 650nm red laser diode, if I use 2 AA batteries(3v)?

5mW 650nm red laser diode


Answers:    Laser diodes require special driver circuits using active devices to regulate the current. Some laser diodes also enjoy a feedback photodiode to be used by the driver circuit to set the proper current. Using a resistor would greatly increase the likelihood of destroying the laser diode.

Furthermore, you can't simply assume P=E^2/R and plug within 5 mW for P and 3 for E. An 18OO-ohm resistor would dissipate 5 mW if connected across a 3-volt supply IN ABSENCE OF A LASER DIODE. It would not be appropriate to drive a 5 mW laser diode.
To properly power the flux capacitor you need plutonium or a lightning bolt to shoot down a column off the city clock tower.

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