RED laser from DVD-RW

[boraicho]

hi. i am dismantled today a DVD-RW how much current i have use for red laser and how much i have use for infrared laser. thanks.

 

[SKeeZ]

The infrared is almost not worth messing with but the red could take i would expect around 400mA. if you are too afraid of blowing it, use 300 or 350mA

 

[crazyspaz]

this has been answered many, many times.use the search bar at the bottom of the page. If you ask questions like this (that have been answered many times) before doing very simple and easy research of your own, you will get negative feedback from people. Please, research first, and if you cant find your answer, THEN make a thread.

 

[boraicho]

i thought that is it FAQ about red laser from DVD RW, but i am looked for but i didn't find this information.
maybe it will be interesting for somebody. i want to use another IC1 maybe MCP6022 and 5V power source and Q1 some FET
http://www.fastimages.eu/images/currentsou.png

 

[The Lightning Stalker]

That would make a nice driver, if not a bit high in the parts count. You could put a capacitor across R6 to
get a soft start.

 

[grainde]

Try an AMC 350 mA driver. You can use a single chip, or buy a complete driver from Kaidomain, FT, DX etc:beer:

 

[The Lightning Stalker]

With any of these, make sure there is at least a 10μF capacitor across the diode.

 

[alessnilsen]

For a 20~22X DVD-RW red LD you can put up to 400mA, I run mine at 400mA, but I gess 350mA is fine.

And never forget to discharge the 10uF capacitor!

 

[boraicho]

Hi. you mean, that i have to put capacitor here?
http://fastimages.eu/images/currenryr.png

when i am built my first laser projector with steppers motors,
so i am proposed this laser driver with blanking for green laser diode from laser pen. it's very complex :shhh:

laser:
http://www.fastimages.eu/images/dsc034hyh.jpg
driver:
http://www.fastimages.eu/images/dsc034efe.jpg
scheme:
http://www.fastimages.eu/images/hardpowerl.png

as blanking source i am used TL494 so i can change frequency and PWM really interesting. i want to change whole module for a little processor but i fuck it.

 

[The Lightning Stalker]

Yes. It helps stabilize the current. I'd like to see a video of all this working, especially since you're using stepper motors as galvos.

 

[boraicho]

i do not expect that it will be, as laser projector with galvo, but galvo is very expensive for my requirements and spirograph with DC motors already i don't want to use.
GreenLaserMAX - YouTube

 

[Blord]

The current depends how old or what the write speed is of the DVD writer. The older ones can't take 350-400mA. It will burned out the laserdiode right away.

 

[The Lightning Stalker]

Cool video! That looks quite nice.

 

[boraicho]

hi. so, i was look at to the trash can and i found it.
it's LG multi dvd writer GSA-H42N it's 18x writer
how current you recommend?
thanks
LG GSA H42N Super-Multi Overview & Specs - DVD Drives - CNET Reviews

 

[The Lightning Stalker]

I believe that is the famous long open can. Some of those can take upwards of 450mA depending on how
good of a heatsink they are in. Keep an eye (or a finger) on the heat until you know what your heatsink is
capable of.

 

[boraicho]

ok thanks, i will use 400mA it's will be ok.