30mW dx.com laser module help

[simoneken1]

Hi, i am very new to this and i just got my 30mW green laser module
which is this one and i was wondering, if i want to use the spring for power, is the spring positive or negative

and the other connection is the case arround the diode,right?

 

[kilter]

THe spring is negative. By the way, welcome! A good way to introdoce yourself is in the Welcome Area!