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

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.

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Its a current regulator !!!!!

You HAVE to have a regulator.

tim127 (author)  steveastrouk6 years ago
so i need to get 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
tim127 (author)  steveastrouk6 years ago
ok thank you
AndyGadget6 years ago
As Steve says, it's to regulate the current.  To take one of those lasers apart you'll probably have to 'peel' the outer tube away from the laser module.   On the back of the laser module there will be a small PCB with a tiny potentiometer.  Turning this sets the current but turn it up too far and you'll cook the laser.

The module you link uses 2 x 1.5V batteries so running the module at 9V would definitely fry it.  Much better to use a couple of AA or AAA batteries in the Altoids tin.