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Dvd-rw red diode with drivers from green laser?

K

kazom

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Hello,

I just got a DVD-RW laser diode and is it possible to use it with a 20mW green laser driver from dealextreme? and if it's possible, how do i know how i should set the pot?

Thank you for helping :san:
 





D

Deleted member 8382

Guest
Oh wait, you plan to disasamble this pen in order to extract the driver? The specific drivers we use are exactly 13$! Search for rckstr driver on the forum ;)

Answering your question, I doubt this driver will work.
 
K

kazom

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hmm okay, i have no money so i can't buy one but is there any way that i can build a cheap driver myself or modify the green one so it works ? i have a broken green laser but the driver is working that's why i want to use it ^^
 
D

Deleted member 8382

Guest
A cheap driver for a red diode? Sure. A constant current driver based on the lm317 chip is a fairly extended way to drive them. Read this:

It can be done - Laser driver

All the parts here are under 1$. They are not as efficient as the specific drivers you might buy but they just work ;)

Yours,
Albert
 
D

Deleted member 8382

Guest
Any doubt feel free to post here and PM me about it. I check the PM box daily ;)
 
D

Deleted member 8382

Guest
By the way, if you wanna go cheap, forget about the pot in the diagram, you only need it if you plan to decrease the power (no xd). The diode is there to protect the diode if you put the batteries the wrong way. If you know what you're doing you can avoid it too ;)
 
K

kazom

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So i only need a regulator, 2 resistors and a capacitor ?:O
thought it was really complicated to make a driver first ^^

Btw , will a LM317T work instead of a LM317 and what is mfd? i have a couple of capacitors but they just have volts and uf.
 
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D

Deleted member 8382

Guest
mfd means millifarads I guess. It's the unit in which the capacity of a cacpacitor is measured. The only thing you need to drive a diode safely is a constant current. The LM317 with a resistor IS this. We use 2 of them to get the current we want, and the capacitor to "stabilize" the output, since diodes are very sensitives. At the end you an use 10mfd, 47mfd, 100mfd or any similar value, so if you got something near it will work too.
 
D

Deleted member 8382

Guest
btw, before doing anything, please take a photo of the diode and post it, this way I can know the maximum current it can take and so I'll say you which resistors you gonna use on the driver (2x10ohms are only for the LOCs, the best diodes we have. This might not be the yours ;) )
 
K

kazom

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The diode is soldered to the green laser driver as you see but it didn't work ^^
sry for crappy image, was taken with my phone :p
wtp.jpg
 
Last edited:
lazerov

lazerov

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Sep 21, 2009
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kazom said:
The diode is soldered to the green laser driver as you see but it didn't work ^^
Click to expand...
Is that the red diode soldered to the driver on the picture ? If yes, than you have reversed the diode polarity. Red diodes have reverse polarity in comparison to IR laser diodes used in green modules.
This picture shows the pin-out of a red diode /pic from the LD thread/:
lpc.png

As you can see red diodes are case negative, in contrast to IR which are case positive. I hope you haven't killed your diode with reverse voltage.
 
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