- Aug 21, 2019
i recently bought a couple of 20mw 405nm laser diodes to tinker around with (i’m a newcomer to lasers so i really don’t know what i’m doing) and the seller said that the working voltage is 4.7 volts. i built an lm317 constant current regulator with and output of 4.7 volts and the laser is very dim. i also hooked the diode up to 8 volts and it worked, was very bright but then died could someone give me an ideal voltage for the diode? thanks in advance !