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Will do.

It is in fact for a CNC so i will probably go with a transistor or MOSSFET Thanks Eudaimonium for your help in answering my question.

How about if i just used a MOSSFET instead of the transistor and relay so the relay is not clicking all the time. Another variation i was thinking of is switching the ground of the laser for on / off control.

Ah darn. Ok i hosted on Photobucket. Hopefully it is working now.

I am wanting to find the best place to switch my laser on and off. I uploaded a terrible picture of my circuit. Basically what i have drawn is switching the ground from the power supply to the driver circuit via a transistor and a relay. Is this the best place to switch this circuit?

Sorry about that, This forums navigation is different than i am used to.

Guess thats why i was asking for suggestions. Maybe it can be changed.

I ordered this pair just now. Eagle Pair® 190-470nm & 660-760nm Laser Safety Goggles

Would these be considered sufficient for safety glasses. If anybody has other suggestions iam all ears. http://www.amazon.com/Metro-Shop-Stylish-405nm-473nm-Protection/dp/B00HSG4JY2/ref=sr_1_109?ie=UTF8&qid=1415147297&sr=8-109&keywords=laser+safety+glasses

I was able to get a 6.8, 2.7 and a 1.2 ohm resistors in 2w. Comes out to .74032 ohms by the calculator. This is a touch on the cautious side but i suspect it will be ok? If this is turning out ok i may move into a LM338 instead of the LM317. I am going to get beat up on this answer to...

I have no valid argument for the resistance and would tend to go with your claims. I am using a 25 yr old Fluke that is about .5 ohms off, so i was subtracting that from the read value. Best thing would be to up the ohms to a safer value.

Ah ya right. Thanks for the correction. The real world resistance is .6 ohms but that still makes the current a touch high. I will try your suggestion of resistors ( 1.2, 2.2 and 6.8Ω ) to get closer to the mark. Thanks

They are 2W resistors. I remove the pot last night and do have a stronger laser because of it.

My first go around with lasers. This is of course a CPU heatsink bored out to 12mm and the carriage it mounts to. 3D printed. http://i831.photobucket.com/albums/zz239/MY3DPH/Laser/IMG_20141103_193927_zpsa67679d4.jpg...

I am using that schematic provided by Lighten Stalker. I have 2 one ohm 5% resistors in parallel there giving me right at .6 ohms. I am just using the one ohm resistor in line of the diode to check the current. But i think now the one ohm is much to high. The only reason i was checking the...

I have a 2W blue lasre in a housing, specificallyhttp://www.amazon.com/gp/product/B00HFHJBDI/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 this one. I am using the standard LM317 driver circuit. This laser is rated to 1.8A I know it is not good to max it out all the time. I am checking the...

This is my first laser go-around so i thought it would be good to see what i am putting through the diode at any given time. Keep an eye on it.

Thanks for the comment AGR. Would it also work to have a amp meter in line continuously for a running check on the current? Or is a set it and forget it kind of thing.

Hi. New here. I would like to know if i can use a 5A amp meter and connect it like a standard amp meter in line with the current draw as standard amp meters are done, but in my LM317 driver circuit. I have a 2W blue diode in a housing and glass lens's. Thanks

Background in Arduino, 3D printers, electronics among most any other hobbie, that now includes lasers.