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I'm considering in getting this diode for my laser I'm building. 405nm 300mW blu-ray laser diode 6x blu-ray diode sled | eBay Do you think it will really putout 300mW at 320mA ? Has anyone tried one of these diodes ? Also whats a good way to find/test the mW power of this laser when its done...

Hi I just have these two qusetion about the lm317. First is the voltage drop and the voltage need by the regulator the same thing ? Also does the 317 use 2.5~3v for both constant current regulating and voltage regulating. thanks you guys Sorry this thread is not important anymore. Questions...

OK i have been trying to figure this out for at lease 4 hours straight and its driving me nuts ! :banghead: How is it that for a red laser you need a power supply of 7.2 when the diode needs 3, 1.2 for long life between battery changes and the lm317's dropout voltage is 1.2. Thats only 5.4...

Hi this is my first post on LPF and I have know about this place for awhile and am so happy that there is a site so full of great info and kind people. Sorry if I ask any noobish things but I think I did my research. I have a laser I built awhile ago and works just fine. It is a 658nm laser...