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Thanks Aleksa. I am familiar with electronics, but not with driving a laser diode. As quite a lot of people seem to be happy using a LM317 as constant current source I thought there shouldn't be so much of a problem. I double checked my circuit and could not find any errors in assembly. I am...

Interesting, how do you see that? I mean, the dot looks "small" to me. But nevertheless I suppose you are right, because otherwise something would happen. In your schematic: what is "U1 B14" and "Q1 617"? I can't find them. Thank you very much!

Sorry: 1st one focussed 2nd one "not very focussed" distance laserdiode-paper roughly 5 cm http://www.imgbox.de/show/img/WV3I2b9cd9.jpg http://www.imgbox.de/show/img/B5HLvyl2kg.jpg EDIT: I used the embed IMG tag, but the pictures won't show up, so sorry about the link.

I see. Well, the beam definitely looks like a laser beam, but a very dim one. It reaches about 50 cm. The diode itself looks "unharmed" from the outside.

I edited my first post the other minute, sorry. I have a second, identical laserdiode with the same results. The schematic I used is the one with +9V supply: http://1.bp.blogspot.com/-ewI7TGlE0q8/UmvuF9vmrSI/AAAAAAAABrM/pn0yN2P9Vpo/s1600/laser_driver.png Do you have a link/source for a "better"...

Hello, I have built a DIY Laser engraver according to this tutorial: fun of DIY: A Raspberry Pi controlled mini CNC Laser engraver [last update Jan 18,2014] I bought this laserdiode: Sony RLD65PZB5 658nm Laserdiode 80mw/240mw - Insaneware Deluxe According to the specs it can supply ~120 mW CW...