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Old 02-01-2013, 10:09 PM #1
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Default First LM317 Driver build! - What voltage?

Hi there guys! So I'll start by saying I'm very new to building lasers, so this forum included, and I would love to be apart of it. I'll appreciate any bit of help I can get or even "critical" advice.

So I'm starting my first build with a custom made driver, I'm just using the basic LM317 driver build that I'm seeing all over the site. I'm uncertain what to look at though when determining the battery voltage I should be using.

I'm using a 405nm Diode and I'm using a 10 ohm resistor in my Driver to create a current of 1.25mA. Any help determining the battery voltage I should be using?



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Old 02-02-2013, 12:00 PM #2
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Default Re: First LM317 Driver build! - What voltage?

If you read this thread all will be explained about
dropout voltages and input power for the LM317
current regulated Laser Diode Driver.....

DIY Homemade laser diode driver


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Old 02-02-2013, 01:40 PM #3
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Default Re: First LM317 Driver build! - What voltage?

1.25mA? That won't even make the diode lase. I assume you mean 125mA.
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Old 02-02-2013, 03:04 PM #4
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Default Re: First LM317 Driver build! - What voltage?

I did mean 125mA, my bad.
But thank you for the redirection, I have everything I need to know now.
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