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ArcticMyst Security by Avery

16x DVDRW Diode wont burn through anything

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May 5, 2010
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I've followed the AI and make my own driver for it but it doesn't seem to have enough power to burn through anything.
I follow this AI:
http://i485.photobucket.com/albums/rr220/iskor12/LM317_components01_001.jpg

it doesn't matter if I use one 10ohm resistor or two, it still won't burn through anything. The only thing that I use different is instead of 100ohm pot I use 25ohm Pot and use 35v 47MF capacitor instead of 16v 10MF capacitor. can someone help me out. I'm a total beginner. so please easy on me.


added:
Ok I will replace the Pot with the 100ohm. But for the resistor, how can I get to 3.125ohms, I can only find 1ohm and 10ohms at the store. Te only way I can get close to 3.125 is to put 3 10ohms resistor in parallel (10/3=3.333). Also with 400mA, will it kill the diode?
 
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crypt

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Mar 24, 2010
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just guessing but do you think the 25 ohm pot mite be the problem?
because its not letting enough power through? i mean it is 1/4 of the ohms called for in the diagram
just food for thought
-Crypt
 
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Mar 17, 2010
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You should replace the two 10 ohm resistors and potentiometer, with one single resistor. The resistor you need is determined by a formula: R = 1.25 / desired current (A). The best current would be around 400mA so you would need around 3.125 ohms.
 
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I've change the Pot to 100ohm and it seem to be stronger than before. I use 5ohms resistor and it was able to burn but it take about 10sec to start burning so I change to 4.7ohms and it take longer to burn. After that I switch back to 5ohms the laser was really dim and now it wont goes any brighter, it stay dim no matter what I do. Does that mean I've burn out my diode?
 

Grix

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Dec 9, 2008
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Yes it does, unfortunately. 400mA isn't very good for 16x diodes. I would've limited it to 300mA. You might also have done something wrong, like connecting the diode after the power was turned on. That would kill a diode instantly.
 

Grix

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You live and learn :) Luckily those diodes are less than $10 each.
 
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Hic. I've killed 5 diode already. 4 are from broken DVDRW that I have and 1 From my PC :cryyy::cryyy::cryyy: 4 of them I shock it so that is why it die, but this 5th one didnt die, its just dim, really dim. I'm out of DIODE now. SOOOO SAD.
 
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Mar 17, 2010
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Hic. I've killed 5 diode already. 4 are from broken DVDRW that I have and 1 From my PC :cryyy::cryyy::cryyy: 4 of them I shock it so that is why it die, but this 5th one didnt die, its just dim, really dim. I'm out of DIODE now. SOOOO SAD.

Does it produce a dim dot or the diode shines like a weak LED? If it does produce a dot even if it's weak then the diode isn't dead, but the batteries are probably empty. If it doesn't produce a dot at all and it only shines like a LED than I'm afraid it is dead.
 




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