im using LG 20x DVD burner diode, please help!

• Jan 25, 2008

• #49

Gazoo

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So you are going to use a 7805 and regulate the voltage and run it with 4.5 volts? Please explain how that's going to work when the same holds true with the 7805, as with the 317 as far as running into problems with the regulator dropping out. You would need to use the same configuration as has been suggested to you. And using a voltage regulator you are asking for trouble. What happens is as the diode heats up it draws more current if using a voltage regulator. What do you think will happen? Is thermal runaway a possibility? I don't know and I am not about to find out. Irregardless, by using a current regulator the current going to the diode remains constant, no matter how cold or hot the diode is.

 

• Jan 25, 2008

• #50

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chido

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Well, if you're willing to use another driver, use the AMC7135 driver, that way you can use normal CR2s without a problem, just limit the current down to 240mA using a 33ohm resistor.
You can find Gazoo's analysis on the driver here:
http://www.laserpointerforums.com/forums/YaBB.pl?num=1191898669/0
NVM, just read you can't put anymore than 4.5v in it.

 

• Jan 25, 2008

• #51

Gazoo

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chido said:

Holy crap DDL was wrong

Click to expand...

Yes and I caught the rest of your post about the batteries...lol I would have to look it up, but the 350ma rating the manufacturer gives might be with a load of .1C for example...this would be 35ma's. If they were rated with a 1C load then they should run a 350ma load for 1 hour.

Back to the silicon diode...there is an easy way to prove this to yourself. Take a DMM and measure the voltage of a battery with and without the silicon diode in place. The voltage will be exactly the same. The band side of the diode goes to positive.

 

• Jan 25, 2008

• #52

adgmeijin

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so do you have schematics for that driver using that 7135? please give me the connection pattern.thanks

 

• Jan 25, 2008

• #53

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chido

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OOOOOOOOOHHHHHHHHHHH!!!!!! you caught my post. :-[
And I'll do that with the diode as soon as I get a DMM, I found a good craftsman one at Sears for 20 bucks. ;D (adgmeijin, sorry for jacking the thread man)

 

• Jan 25, 2008

• #54

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chido

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adgmeijin said:

so do you have schematics for that driver using that 7135? please give me the connection pattern.thanks

Click to expand...

Go to the link I posted, you have to buy it.

 

• Jan 25, 2008

• #55

Gazoo

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adgmeijin said:

so do you have schematics for that driver using that 7135? please give me the connection pattern.thanks

Click to expand...

Here is a link to the pdf file..

http://www.micro-bridge.com/data/ADD/AMC7135.pdf

 

• Jan 25, 2008

• #56

adgmeijin

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its ok chido, thanks gazoo... i try to buy one or make one..

 

• Jan 25, 2008

• #57

adgmeijin

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hey guys, do i need a trimmer for this driver or is it already regulated?i will just add 33ohm 1/2 watt , 47uf 25v capacitor, 1n4001 diode. and all those additional parts must be connected parallel to LD, right?

 

• Jan 25, 2008

• #58

Gazoo

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adgmeijin said:

hey guys, do i need a trimmer for this driver or is it already regulated?i will just add 33ohm 1/2 watt , 47uf 25v capacitor, 1n4001 diode. and all those additional parts must be connected parallel to LD, right?

Click to expand...

The 7135 DX sells is already polarity protected. You so not need the silicon diode. You do not need the 33ohm resister...it is needed only if using SenKat's diodes.

You can run the open can straight off the regulator, all you need is the capacitor, and a 10uf 16 volt capacitor will be more than sufficient.

 

• Jan 25, 2008

• #59

adgmeijin

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thanks gazoo, you know i found AMC7135 packed on TO-220 , i dont know if its the same system as the smaller ones, please clear it to me, thanks.

 

• Jan 25, 2008

• #60

Gazoo

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Can you post the link for that or the data sheet. According to AMC, it comes in a SOT-89 or a TO-252 case.

 

• Jan 25, 2008

• #61

adgmeijin

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(http://amc7135.chinaicmart.com/) try to see it.

 

• Jan 26, 2008

• #62

adgmeijin

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Guys here's my final casing for my DVD laser, the HEATSINK attached to it was from some hardware around my place, the HEATSINK you see here was accessories of some car tool.

 

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• Jan 26, 2008

• #63

Gazoo

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adgmeijin said:

(http://amc7135.chinaicmart.com/) try to see it.

Click to expand...

I think it might be a typo or misunderstanding on their part. AMC does make other regulators in the TO-220 case, but not the 7135.

http://www.micro-bridge.com/data/add/2008productselectionguide.pdf

 

• Jan 26, 2008

• #64

adgmeijin

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hey gazoo is there other option instead of using AMC7135? FYI idont have any credit card accounts here i only sending payment through WESTERN UNION, thats it but if you have other suggestion DVD LD driver i can be use rather than AMC7135, i cant continue this project because DDL LD driver was useless. If you read this Daedal, please prove your LD driver was not wrong..