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Old 03-27-2010, 01:28 PM   #51
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Default Re: 1000 mw Burning Diode Need Help!

Supposing you're still talking about IR 9mm can diodes with only 2 leads, the lead that is connected to the case is the positive, where instead the lead that have the "black ring" around (is a pass-wire made usually in glass, that insulate the lead from the case) is negative.

Opposite to the red diodes, that have case positive.

BTW, you see the 808nm diodes as a dim red light, but be careful, it's still IR, and also if it looks dim, it can still blind you, if is 1W.

But for be sure if your diode works or not, you need to see the IR, and this can be easily done through a webcam (almost all the webcams see IR as bright pink, only few of them have anti-IR filters in the lenses ..... but if you want to be sure, get one of these old b/w cams, they all see IR, and are also cheaper) .....
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Old 03-27-2010, 04:35 PM   #52
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Default Re: 1000 mw Burning Diode Need Help!

Ok with the diode wired the correct way iam measuring voltage at the diode legs (with everything wired up) I read 1.415 volts with a 9 volt battery. now with thw diode unplugged, at the output wires Iam reading 8.59 volts. And both ways my voltage regulator is cold to touch (also diode when plugged in).
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Old 03-27-2010, 04:43 PM   #53
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Question Re: 1000 mw Burning Diode Need Help!

Yes, but what is the CURRENT, not the voltage ?

Do this, if you can ..... take an 1 ohm 1 watt or 2 watt resistor, and connect it in serie of your diode, then measure how much millivolts you have at the leads of the resistor ..... with an 1 ohm resistor, each millivolt is a milliampere that flow through the diode .....
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Old 03-27-2010, 08:38 PM   #54
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Default Re: 1000 mw Burning Diode Need Help!

Do you use yahoo messanger or aim? this might be easer to be walked through, I opened the ground on my diode and put my dmm in series measuring amps and the circuit is pulling .012 amps

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Old 03-27-2010, 09:19 PM   #55
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Default Re: 1000 mw Burning Diode Need Help!

Quote:
Originally Posted by photonaholic View Post
The green lasers we are all used to here do not have a "green diode"

They use a powerful Infrared diode to pump a solid state crystal that doubles the frequency to produce green.

Sam's Laser FAQ: Welcome Page





One of my green lasers easily cutting a plastic cup.



two greens from 50 feet away, no smoke or fog.



destroying a chunk of dry ice....





How powerful was it?
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Old 03-28-2010, 01:44 PM   #56
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Question Re: 1000 mw Burning Diode Need Help!

Quote:
Originally Posted by Darkknight23 View Post
Do you use yahoo messanger or aim? this might be easer to be walked through, I opened the ground on my diode and put my dmm in series measuring amps and the circuit is pulling .012 amps
Sorry, i have nothing other than skype here ..... anyway, 0,012A is decisely too low ..... for an 1W IR, it must be one ampere or more, depend from the diode type ..... sure that your driver is working correctly ? ..... have you tried it with a high power test load ? (like, 4 diodes BY255 type, plus an 1 ohm 5W, all in serie)
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Old 03-28-2010, 03:52 PM   #57
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Default Re: 1000 mw Burning Diode Need Help!

I built another driver and the still nothing but this one the regulator actually get hot and iam getting .789 amps out of, http://3.bp.blogspot.com/_4wHo2MPDwA...0-h/Driver.jpg that is the electrical schematic I followed but I only used 1 4 ohm resistor. what I dont under stant tho is why on thee is the negative side of the diode and the negative side of the capasitor on the positive side of the circuit? and why do they tie the 2 legs of the potentiometer together I thought it they would ure it to adjust the voltage? Sorry about all the questions but this is my first laser anbd I really want to understand it, I have been reading averything I can find on them and also how to check all the components and that why I was wondering about the negative side of the diode and capasito in the positive side. How would you build the circuit would it be like thae one I built? My skype is terrance.rowe

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Old 03-28-2010, 04:29 PM   #58
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Thumbs down Re: 1000 mw Burning Diode Need Help!

That schematic is wrong.

and also, the diode shown have the negative on the case (central pin), so is a red diode, not an IR diode (they have the case as positive ..... if they are 2 pins case, there's no problems, if they are 3 pins case, the central is connected to the case and is the positive ..... wait, i'm taking some pics, so is more clear)
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Old 03-28-2010, 04:30 PM   #59
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Default Re: 1000 mw Burning Diode Need Help!

the negative part of the silicon diode has a grey ring around it and the longest leg on the capacitor is the positive just like normal led's.

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Also, would a crap-load of evenly-wound aluminum duct tape work for heatsinking around the Aixiz module?
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Old 03-28-2010, 04:59 PM   #60
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Default Re: 1000 mw Burning Diode Need Help!

Ok, now ...... first of all, the diode ..... as you can see, there's 2 different styles for the 9mm cans, 2 and 3 pins ..... for the IR diodes, and ONLY for the IR ones, these are the polarities:



Second, that schematic was wrong ..... i personally always use this one, that also grant a bit more survival to the trimmer ..... changing the values of the 2 resistors, it can be made for different ranges of current, and is also much more stable (and just for safety, you can add also a 470 or 560 ohm resistor in parallel to the output, so it discharge the capacitor when there's no diodes connected and avoid that you can fry the LD connecting it to the driver with a charged capacitor)



BTW, you can also use the LM1117 with the same schematic, for have a less dropout ..... but, for an 1W diode, it may be not enough to use a single regulator, or at least it require a lot of heatsinking ..... in this case, the LM117 (is different from the LM1117) is better, cause it work with higher temperature limit .....
Attached Thumbnails
1000 mw Burning Diode Need Help!-lm317driver01.jpg   1000 mw Burning Diode Need Help!-9mmircases.jpg  
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Old 03-28-2010, 07:46 PM   #61
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Default Re: 1000 mw Burning Diode Need Help!

Hmm looks like iam going to have to get more parts, so did I blow up my diode then? I mean in the diode function on the dmm it still reads like a normal diode. Ya I thought that schematic might have been messed up my diode only had 2 legs.
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Old 03-29-2010, 07:01 PM   #62
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Default Re: 1000 mw Burning Diode Need Help!

Is possible that your diode is broken, but being an 808nm, it's hard to say yes or no with bare eyes .....

You need a webcam that show the IR (the cheapest ones usually don't have anti-IR filters in the lens assembly), or a photocam or videocamera that can see IR ..... for try if they see the IR, just point them on the led of a TV remote control and press a key, if you see light flashes, they see IR .....

Now, set your diode in some stable holder (also a third hand / helping hand is ok for a quick test), and connect it to your driver in the correct way, with the trimmer in the maximum resistance position, and point the diode to a wall or a flat surface, non reflective (cardboard, paper or similar) at 10 or 15cm of distance, point the webcam/camera on the same point on the wall/cardboard/whatever you use, and power up the diode (NEVER point the camera directly to the diode ..... no reasons for risk to damage it)

At this point, if your diode still emits something, with enough current you must see some light on the wall, through the camers (not at eyes) ..... the schematic that i have posted, with these values, permit you to change the current from approximatively 80mA to approximatively 430mA (enough for test the diode and see if it lase), and usually those diodes have a threshold (current where they start to lase) around 160/180mA ..... at low current, you probably see just a very faint halo of light, with no defined shape, like this



Slowly increasing the current, if the light remain the same, or increase a bit, but not take a defined shape, then your diode is LEDed (it don't lase anymore, and you can throw it away) ..... as example, also this one is LEDed ..... very bright at 650mA, but no lasing, just a spot



If at a certain point instead the light halo change shape, assuming a shape like these ones, and remaining "in shape" increasing the current, then it still lase (don't keep these tests more long that 5 or 10 seconds, in these conditions and without a heatsink) ..... just after the threshold level:



and at 300mA:



also this one is lasing ..... more large shaped bar, but still stable and coherent



If instead you see "half bars", or bars with black spots or lines through them, or very deformed, the diode is still lasing, but the chip is damaged, and you can throw it away.
Attached Thumbnails
1000 mw Burning Diode Need Help!-ird01.jpg   1000 mw Burning Diode Need Help!-ird02.jpg   1000 mw Burning Diode Need Help!-ird03.jpg   1000 mw Burning Diode Need Help!-ird04.jpg   1000 mw Burning Diode Need Help!-ird05.jpg  

1000 mw Burning Diode Need Help!-ird06.jpg  
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Old 03-30-2010, 01:08 AM   #63
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Default Re: 1000 mw Burning Diode Need Help!

Thank you for the help, I will let you know what happens when I get the components.
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Old 04-10-2010, 06:11 PM   #64
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Default Re: 1000 mw Burning Diode Need Help!

Ok I got the stuff kinda but the electrolytic capacitors are 35v instead of 16v will that work? also I could not get ahold of a 3.3 ohm resistior to save my life. but i got everything else i guess. what else could i use to replace that 3.3 ohm resistor?
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Old 04-11-2010, 10:11 AM   #65
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Default Re: 1000 mw Burning Diode Need Help!

The voltage marked on the capacitors is the absolute maximum voltage that you may use with them ..... is always a good idea to get capacitors with at least 50 to 100% more breakdown voltage than the one that you have to use in the circuit, and if it's higher, is just better (except if it's too much higher, but this is a different discussion), so yes, 35V are ok ..... in fact, for 12V, anything from 16 to 50 V is ok.

and for the 3,3 ohm resistor, you can just place 3 resistors of 10 ohm in parallel .....

I also suggest you to use a capacitor on the output, like, a 22, 33 or 47 uF one, with a 470 ohm resistor in parallel, if you plan to use that driver for regular usage, and not just for a test ..... more stable and more safe
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Old 04-11-2010, 05:44 PM   #66
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Default Re: 1000 mw Burning Diode Need Help!

Would you happen to have another wiring diagram or modify the one you sent to me with the 470 ohm resistor and capasitor, sorry i do better looking at the wiring diagram then trying myself. lol thx
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Old 04-14-2010, 03:40 PM   #67
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Default Re: 1000 mw Burning Diode Need Help!

Do you think I could use a 100 ohm trimmer instead of a 50 ohm?
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Old 04-14-2010, 04:17 PM   #68
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Default Re: 1000 mw Burning Diode Need Help!

Quote:
Originally Posted by Darkknight23 View Post
Do you think I could use a 100 ohm trimmer instead of a 50 ohm?
yes you could, but it will be a little bit more 'twitchy'

not a problem though, rckstr uses 100ohm pots in his version of the ddl driver and they are damn good drivers so you should be fine.

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Also, would a crap-load of evenly-wound aluminum duct tape work for heatsinking around the Aixiz module?
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Old 04-14-2010, 04:18 PM   #69
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Default Re: 1000 mw Burning Diode Need Help!

Hi, sorry for the delay.

Yes, you can use a 100 ohm trimmer, it's just more sensitive to adjust at the higher current ..... by the way, using that schematic with a 1W diode, is also better to change the 22 ohm resistor with a 10 ohm one, so the trimmer get less stress ..... or better, calculate the new values specifically for the current that you need.

What is the current that you want to use with that diode ? ..... knowing it, can give you directly the values.

About the driver, it's ok in this way, only add a 470 or 560 ohm resistor in parallel to the output capacitors, so they get discharged when the driver is not powered, and you don't risk to burn the diode connecting it with the capacitors charged.
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Old 04-15-2010, 02:31 PM   #70
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Default Re: 1000 mw Burning Diode Need Help!

Ya iam just trying to get the most power out of the diode and also a long life, or what i can. ya I was thinking about just puting 3 10ohm resistors in parallel like you said, would that still be ok with thw 100 ohm trimmer?
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Old 04-15-2010, 04:01 PM   #71
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Default Re: 1000 mw Burning Diode Need Help!

Using a 3,3 ohm and a 100 ohm trimmer in serie, and changing the 22 ohm one with a 10 ohm resistor, you can regulate it from 110mA to 500mA ..... these values must permit you to check and test your diode (is less than the maximum usually required from an 1W IR diode, and must not damage it) ..... anyway, can be better if you know the characteristics of your diode, before make trials with higher currents .....
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Old 05-04-2010, 03:37 AM   #72
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Default Re: 1000 mw Burning Diode Need Help!

Ok i got the rest of the parts and built the circuit to the schematics you sent identical to them except i used the 1117 regulator you said to use. I hooked a 9 volt battery to the diode and turned it on, i kinda leaned over and looked at it on an angle and saw a tiny dim red light but thats all I get. how do you focus it? The circuit is only pulling .116min to .159max amps

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Old 05-04-2010, 07:12 AM   #73
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Default Re: 1000 mw Burning Diode Need Help!

how 1000mw how much would that cost. didnt even know there was a 1000mw diode.
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Old 05-04-2010, 07:39 AM   #74
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Default Re: 1000 mw Burning Diode Need Help!

This is a IR diode at 808nm. It will be invisible unless under optimal conditions. It is also multmode so focusing the beam will be difficult and will make burning hard. These diodes are of really little use to laser enthusiasts without a set of crystals to make green.

There are laser diodes upwards of 3 watts, look around and you will find some cool stuff!
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Old 05-04-2010, 07:46 AM   #75
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Default Re: 1000 mw Burning Diode Need Help!

@ Darkknight: if you are using a small "transistor radio type" 9V battery, this type of batteries don't have enough current for this use ..... if you want to use batteries at around 1A, you need at least C or D cells ..... or some good AA alkaline, that anyway don't last too long ..... or Li-Ion cells.

Try with a power supply that can give you at least 1A, and don't look inside the laser diode also if not focused !! ..... with 1W of IR, is still dangerous !! ..... your eyes see the 808nm of an 1W IR LD as very dim red, but the quantity of light is still 1W ..... only, the eye don't react to it closing the lid as with the normal light, you don't notice it, and your retina can become irreversibly damaged before you notice it (or, said in other words, you notice the damage when you have already irreversibly lost your sight and at this point there's nothing more to do )



@ GreenLaser: as far as i know, the 1W 808nm diodes are all 9mm types, or, at least, til now i never found any of them in 5,6mm with that power, the more powerful ones that i had around in 5,6mm was 300mW clodsed can and 500mW open can.

For the cost, it depend from the source ..... tested, granted and selected ones from specialized shops are insanely priced, and the cheap ones on ebay are all a bet, you can get the right one, or the wrong one, or anything in the middle .....
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LinkBack to this Thread: http://laserpointerforums.com/f50/1000-mw-burning-diode-need-help-48893.html
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orkut - Laser feito com o leitor de gravador d dv This thread Refback 02-09-2011 07:17 PM








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