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Dvd Rw red laser

Mikash

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Oh )))))) dont lough at me , i understood now what stupid thing i did )))
 

Immo1282

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So that means you've got 59mA of current flowing. Try adjusting the pot - if the current doesn't change you are probably right that you blew up your LM317.

It does strike me that a linear driver is shockingly inefficient way to drop 12V to the 2-3v that your diode would take.
 

Mikash

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Lowest mark was 13.1 and the upper 115 , but when i add voltage it is not stable, goes from 95-115 so, so i have bought today new components , lm317, diod , cap and res , i have textolite too, so i want to make new pcb for new driver , so please if you can give me shematic picture of good driver for dvd lase , also what is problem for me when i dissambled dvd , there are 2 lasers they are same for me )) also today i bought laser on the picture but as i guess i cannot use it for mini cnc , here are pictures of that diodes too, Its written 04WDW on first laser and the second one is in its heatsink
 

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Mikash

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Anyone please help with driver circuit )) im sitting with soldering iron in my hand ))
 

diachi

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Lowest mark was 13.1 and the upper 115 , but when i add voltage it is not stable, goes from 95-115 so, so i have bought today new components , lm317, diod , cap and res , i have textolite too, so i want to make new pcb for new driver , so please if you can give me shematic picture of good driver for dvd lase , also what is problem for me when i dissambled dvd , there are 2 lasers they are same for me )) also today i bought laser on the picture but as i guess i cannot use it for mini cnc , here are pictures of that diodes too, Its written 04WDW on first laser and the second one is in its heatsink
One diode is likely the CD diode, which is IR (~780nm) and almost invisible.
 

Anthony P

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I thought the positive and negative rails on those breadboards consisted of one contact? In which case that's basically just a big short circuit with a 1ohm resistor thrown in.

Correct me if I'm wrong?
Diachi is right about that breadboard. Either solder the diodes or use the correct breadboard correctly. Do you own a constant current bench power supply? That would allow you to determine voltage drop on unknown laser diode and then custom tailor you test circuit.
 

Mikash

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I know , i solved thet problem , but i bought new lm317 and other components and im going to buld new driver , if anybody can help wth shematic circuit for dvd laser driver i would be glad .
 

Cyparagon

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You cannot measure a constant current source with no load. The circuit is trying to push current through the air, which isn't possible, so it will keep increasing the voltage in vain. There are countless tutorials on this circuit, and it looks to me like you read one paragraph and are winging the rest in lieu of comprehending the remainder of the tutorials. You will undoubtedly damage more components with your recklessness. That's fine, providing you're learning something and your pocketbook doesn't take too much of a beating. Just realizing you're doing things the hard way.
 

Benm

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Look around the forum for 'dummy loads' - that'll explain what you need to build if you want to test a driver without putting an actual laser diode at risk. A lot has been written on this topic so i don't think it would be useful for me to repeat that here.
 

Immo1282

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Unfortunately, Mikash has kind of failed the "use the search bar" test already...
 

Mikash

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I get why you all got angry on me , i tried to search all topics before but i didnt get answer and thats ehy i posted new topic , sorry if something did wrong , now i have built driver amd everysthing i connected my dvd laser , the problem is that laser burns , but it is not inough , i have done mini cnc engraver and for that i wanted laser. I dont know whats the problem,
 

Immo1282

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We didn't get angry with you because you weren't getting it right - but it helps a lot when starting unfamiliar projects to really read the subject you are going into thoroughly before starting off. There is definitely precedent here with information on how to build Linear drivers - if you didn't find it - that's unlucky but it's definitely there.

There are a few considerations for making a Laser Diode burn - output power, and focus - If the diode you're using does not have an appropriate focusing lens on it, the beam will quickly diverge and become useless for burning/engraving.

In general, 405nm lasers are preferred for engraving purposes as they tend to have 2 good characteristics - They are avaliable and affordable in high powers, and the spot the laser produces can be focused down to a very small fine point compared to other types (powerful 445nm diodes will produce a bar shaped spot for example).
 

Benm

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It's not anger at all, for the dummy load thing i just know there is so much info on here you can find it if you know what terms to search for.

And there is nothing wrong with asking a question: people may say 'use the search' but that would presume you know what you are looking for. If you've never heard of a dummy load you're not likely to search for that, even though doing so probably gives you the answers you need.
 

hakzaw1

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was this thread about CNC ?? seems we have gone off topic..
Do you want to do CNC or spend a LOT of time failing by trying build a cheap laser and driver..
THis is what many do...

https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=405nm+focus+laser+CNC&_sacat=0

^^^ is the search

and below is my suggestion -IF you do not own eye protection PLEASE order the 405 that comes with them...do not buy one without a fan on the laser head (unless you are going to add one yrself)

https://www.ebay.com/itm/500mw-405NM-Blue-Purple-Laser-Module-Focusing-Laser-Engraving-For-CNC-Engraver/362479089436?hash=item54656ff71c:g:bLcAAOSwZtRb4BP0:rk:1:pf:0


good luck (& lose the dvd burner-- methinks you have seen KlipKlay too many times... I betcha.)

Jkidding best wishes
ps if you have eye protection for red lasers they MAY not be good for 405..
what they protect us from is printed on the glasses.. and the OD is important too
 




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