DVD burner in minimag laser..

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stephenmadpotato

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Joined
Jun 20, 2007
Messages
298
Hello all,
I saw that guide to making a dvd red laser in a maglite and I said "Damn I got to get me one of dem." So, I went to ebay for the parts.
First things first, the housing
http://cgi.ebay.com/650nm-5mW-laser...ryZ53141QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

(sorry for the really long link :p)

and that kickass laser diode:
http://cgi.ebay.com/Lot-5-140mW-650...ryZ53141QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
(Yes 5 because I will probably destroy about 4 before getting it right. :p)

and 2 minimags.
http://www.radioshack.com/product/i...&origkw=maglite&support=support&tab=techSpecs

one for me, even though I already have one :p and one for the project.

If anyone has any better link or anything that may help let me know. I am open to suggestions.
 
G

Gazoo

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Apr 21, 2007
Messages
223
Location
South Carolina
You will never get it right unless you add some additional circuitry. This has been discussed a zillion times....do not connect a laser diode directly to the batteries.
 
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cdesigns

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Jul 27, 2007
Messages
111
I have done it with a LG dvd burner diode, using a CR123A brand new battery. It worked fine 2-3 days of testing until I connect it my 3v powersupply and forgot to lower the current :mecry: and it fried my diode at 500mah

Here is the LG diode burning stuff with the CR123A
http://media.putfile.com/DVD-Laser-mod
 
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stephenmadpotato

Enlightened
Joined
Jun 20, 2007
Messages
298
Ok, so heres the plan for the circuit


123.jpg


Anything wrong?
 
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cdesigns

Newly Enlightened
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Jul 27, 2007
Messages
111
You need to adjust the CURRENT not the VOLTAGE. the voltage is always going to vary GOOD batts or WEAK Batts
 
chimo

chimo

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Joined
Sep 16, 2004
Messages
1,905
Location
Ottawa, Canada
stephenmadpotato said:
Anything wrong?
Click to expand...

Yes. The LM317 can be used in a current regulation mode, however, it is a linear regulator and needs a couple of volts of overhead to function properly. That means if your laser diode (LD) voltage will be around 3V at the current you wish to operate it at, you will need another couple of volts more than that from your battery (say ~5V). It will not function as you desire with 2x AA batteries (Alkaline, NiMH, NiCad).

You can search for a voltage regulator with a lower drop-out. I have managed to get about 210mA to a Sony LD from a single li-ion using an MC33269.

Paul
 
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stephenmadpotato

Enlightened
Joined
Jun 20, 2007
Messages
298
chimo said:
Yes. The LM317 can be used in a current regulation mode, however, it is a linear regulator and needs a couple of volts of overhead to function properly. That means if your laser diode (LD) voltage will be around 3V at the current you wish to operate it at, you will need another couple of volts more than that from your battery (say ~5V). It will not function as you desire with 2x AA batteries (Alkaline, NiMH, NiCad).

You can search for a voltage regulator with a lower drop-out. I have managed to get about 210mA to a Sony LD from a single li-ion using an MC33269.

Paul
Click to expand...


Hey paul,

Thanks for the help. I am thinking of backing it down to a basic resistor then. I never learned ohms law and now this is coming back to bite me right in the ***. I did a little research on wikipedia about ohms law.What specifications do I need on a resistor for this to work? Thanks,
Stephen
 
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