First LM317 Driver build! - What voltage?

[He So Pringles]

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?

 

[lasersbee]

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

http://laserpointerforums.com/f42/diy-homemade-laser-diode-driver-26339.html


Jerry

You can contact us at any time on our Website: J.BAUER Electronics

 

[Zeebit]

1.25mA? That won't even make the diode lase. I assume you mean 125mA.

 

[He So Pringles]

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