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what does the driver board exactly do in one of those 5mw ebay lasers? Answered

I have a 5mw laser from ebay(http://cgi.ebay.com/Newest-5mW-5-mW-532nm-Green-Beam-Laser-Pointer-Pen-/300576285338?pt=LH_DefaultDomain_0&hash=item45fbbe229a) and i am trying to put it into an Altoids tin and i need to know if the driver board acts as a regulator or  resister so i can put a 9v battery in it or will it fry the diode.


Its a current regulator !!!!!

You HAVE to have a regulator.


Yes, an LM317 will do you fine. Here's a circuit.

Make R such that R x I = 1.22V

LED driver.JPG