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    How to connect HeNe laser DC supply with three input wires--red, black and purple/violet?

    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...




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