Old 12-14-2009, 03:41 PM #1
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Default Driving a 3v 5mW with 5v power supply

This is all very new to me, and I am trying to figure things out as I go. ie... take it easy on me

I am working on a project that I want to use a low powered green laser. I wish I would have found this site before I purchased my laser... but c'est la vie. I got the cheapest thing I could find on ebay. I haven't gotten it yet, but I am already working the wiring and what not.

This project is using an Arduino microcontroller board which will be using a 9v power adapter. The board itself has 5v power outputs that I will be hooking the laser up to. What I was wondering is do I need to put in some resistors or something?!? to protect the laser? Since there isn't much info about the laser on the ebay page, I don't know if it has a built in driver or not?

One other question is, can a green laser handle be turned on and off repeatedly (ie 1/2 second on 1/2 second off over the course of 30 seconds)?

Thanks for the help.


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Old 12-14-2009, 03:59 PM #2
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Default Re: Driving a 3v 5mW with 5v power supply

Your Green Laser has a driver in it... and to power it properly you
should supply it with the 3 Volts it was designed for (2 X 1.5V)...
Get a Low Drop Out 3 Volt Regulator... That will solve your power
issue..

I can't see a problem of a 50% duty cycle of 500ms... except that
the 532nm Laser may not have a stable beam until it reaches
operating temperature...

BTW....

to the Forum....

Don't forget to read the Newcomers section and the Forum Rules..


Jerry
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Old 12-14-2009, 04:19 PM #3
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Default Re: Driving a 3v 5mW with 5v power supply

Ok, now to read up on Low Dropout Regulators Any suggestions on a good place to get one? Would something like a Fry's or Radioshack have them or do I need to order it online. Sorry really new to all of this, nothing like a challenge to get the creative juices flowing.

Actually an unstable beam would enhance the effect that I am going for I will post some pictures when I get done... should be cool.

Thanks for the welcome. I am reading everything I can!
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Old 12-14-2009, 04:40 PM #4
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Default Re: Driving a 3v 5mW with 5v power supply

The radioshacks I've been to only offer 5V, 12V, and lm317 voltage regulators.
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Old 12-14-2009, 04:59 PM #5
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Default Re: Driving a 3v 5mW with 5v power supply

Here's a Data Sheet for an adjustable output LDO Regulator...

http://www.national.com/ds/LM/LM1117.pdf

Also know as the LM1117...
You'll need to hunt down a small quantity seller in your area..


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Old 12-14-2009, 05:08 PM #6
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Default Re: Driving a 3v 5mW with 5v power supply

Awesome! Thanks guys!
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Old 12-29-2009, 03:00 AM #7
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Default Re: Driving a 3v 5mW with 5v power supply

Ok... I finished my project, a little late, but better than not at all. Here are the results if you are interested, and again thanks for the help!

Video

How I built it
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Old 12-29-2009, 11:15 AM #8
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Default Re: Driving a 3v 5mW with 5v power supply

Nice job... Well done...

Jerry
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