Electronic – How to wire this “green laser module diode”

laserwiring

I am trying to wire a 532 nm, 5 mW green laser module rated at 3 V DC (from ebay).

Front Side
Back Side

But how? I would assume the spring is VCC and the housing is GND, but latter is not connected to any of the two wires which go from the PCB to the laser diode, so there seems to be at least one contact missing.

Also, will I have to use a serial resistor to limit the current to 5 mW, or are the on-board device handling that already?

Update – Solved: The laser module was incorrectly labeled as 3VDC, but is in fact 4.2–5 V. As mentioned in Whiskeyjacks answer, GND is connected to the spring and VCC to the housing.

Best Answer

Connect GND to spring and VCC to the brass material. There is a connection trace going from housing to the component named D882. Onboard circuit will handle the power. Just keep in mind that you power it using correct rated voltage. Over voltage might damage the device.

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