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Thanks for the tip.

Thanks. It's an acrylic (Staron) sheet base, walnut ends, 4mm styrene sheet top (heated and bent over a laser-cut form). The big gap is to allow air flow/cooling, if needed. It is really too bad the power supply label is illegible. I don't have a specific pulsed mode use case in mind. I...

Followup: I built a case to keep me from accidentally touching the exposed high voltage. Then I connected the black and red wires to a variable DC power supply (black to ground) and also connected the purple and black together. Then I slowly cranked up the voltage from 0. At just a bit over...

Ok. Sounds reasonable. I can try first with the purple free, no connection, bringing up the voltage to 12V and see what happens. If no lasing starts I can try grounding the purple through a ~1k resistor, just to be cautious. The seller did say it was removed from some device, it was...

Thanks a lot for the input. Could I put a switch between the purple to ground and use it to turn the laser on and off? How do you know the purple should be grounded? The reason I ask is I was looking through Sam's "HeNe Laser Power Supplies" page and 4 out of 9 DC power supplies listed under...

hi, This is my first post and first laser (other than those $2 diode laser modules from Aliexpress), a helium neon one I got for about $40 w/ power supply. The problem is the power supply has three wires on its input. I assume black is ground, red is +Vcc, but am not sure what to do with the...