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Discussion Starter · #1 ·
I'm trying to build a laser pointer essentially. Anyone good with electronics like this? I bought a laser diode (5v), momentary switch, and some wiring. I wired it up with a 3v battery source and it works but unless the laser is on the wiring heats up HOT. I'd like for that to not happen.

Any advice?
 

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Current limiting Resister.
with out knowing the Diodes number I can only refer you to Ohm's law,

3v souce /Current needed for the diode = resister needed.
 

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I'm unclear on what is triggering the heat; you say "unless the laser is on," which sounds like the switch should be open with no current flowing at all....Is the 'off' position of your switch still leaving a circuit closed? (i.e. for an LED in an illuminated switch or NC contact wired to the battery terminals)

What is your wire gauge and battery type?
 
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