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Old 12-10-2013, 09:36 PM #1
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Default LD died

Ok so I'm a complete idiot and I think I shorted out a diode on a stupid mistake.

Maybe you guys can clear this up for me.

how would you hook up a diode that is case +?
conversely how would you do a case -?
I think i just reversed the polarity on my diode and LED'd it. it lights, but only very dimly now.


the diode pinout its LD cathode(-), common LD anode (+) and photodiode Cathode as the case, and then the photodiode Anode


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476.5nm: Argon Ion Line

483nm Omni-643RYB Whitelight Line
488nm: Argon Ion Line, Spectra Physics >20mW Cyan DECSL Laser, Coherent Sapphire 488-20 OPSL

496.5nm: Argon Ion Line
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591nm: DPSS line
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604.6nm: LOR-150 HeNe line
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690nm: custom diode laser
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1152.6nm: SP-120 HeNe alt. mirrors
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Last edited by ultimatekaiser; 12-10-2013 at 09:38 PM.
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Old 12-10-2013, 10:21 PM #2
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Default Re: LD died

I don't think the polarity is the problem. If you got that wrong, there'd be no light at all.

You're right, the diode went LED. What I'm worried about is your driver setup. Any pictures or aditional information would be great.
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Old 12-10-2013, 10:27 PM #3
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Default Re: LD died

It's an Lm 1117 driver and I'm going to use two 3.7v batteries to power it. The diode needs 2.5V and around 90-100mA I'm at work ATM so I can't take pics.
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476.5nm: Argon Ion Line

483nm Omni-643RYB Whitelight Line
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496.5nm: Argon Ion Line
501.7: Argon Ion Line
514.5nm: Argon Ion Line
520nm: Trustfire A8 Custom

532nm: CNI MGL-F-3W, Coherent Genesis MX Taipan OPSL, LG Hercules-325
543.5nm: 05-LGR-193 Melles Griot HeNe 3.8mW
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568nm: Omni-643RYB Whitelight Line

577nm: Coherent Genesis MX Taipan OPSL
583.8nm: DPSS line
586.2nm: DPSS line
588.6nm: CNI PGL-M-80

591nm: DPSS line
593.5nm CNI MGL-H-50 Lab Laser
594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm: Raman HeNe line?
611.8nm: Melles Griot LOR-150 HeNe (5mW), LOR-006 HeNe (0.5mW)

632.8nm: Spectra Physics Model-127 (>35mW), Model-124B, Model-120, Model-117, others
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 0.5W

671nm: CNI PGL-III-C-100
676nm: Omni-643RYB Whitelight Line
690nm: custom diode laser
694nm: Portable Q-switched Ruby Laser

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Old 12-10-2013, 10:36 PM #4
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Default Re: LD died

TBH i dont actually think shorting the diode's pins would damage the LD itself, the driver yes but as the current isnt flowing through the diode so it should be ok? But it sounds like it's LEDd, maybe the currant was too high?
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Old 12-10-2013, 10:40 PM #5
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Default Re: LD died

Quote:
Originally Posted by ultimatekaiser View Post
It's an Lm 1117 driver and I'm going to use two 3.7v batteries to power it. The diode needs 2.5V and around 90-100mA I'm at work ATM so I can't take pics.
What is the value of the resistance on your Voltage reference line?

In other words, what is between your LM's OUT and ADJ pins?
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Old 12-10-2013, 10:57 PM #6
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Default Re: LD died

Quote:
Originally Posted by NKO29 View Post
TBH i dont actually think shorting the diode's pins would damage the LD itself, the driver yes but as the current isnt flowing through the diode so it should be ok? But it sounds like it's LEDd, maybe the currant was too high?
Yes it does. Even if you direct drive a diode and short the battery, it will go LED.

I founded out that a 100nF ceramic capacitor soldered close to the diode protect it from spikes and in an accidental short, it will save the diode.
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Old 12-11-2013, 12:06 AM #7
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Default Re: LD died

Quote:
Originally Posted by Leodahsan View Post
Yes it does. Even if you direct drive a diode and short the battery, it will go LED.

I founded out that a 100nF ceramic capacitor soldered close to the diode protect it from spikes and in an accidental short, it will save the diode.
Direct driving kills the diode from over current... Having regulated current bypass the LD (shorting across the pins) should mean that the LD will be UN-Harmed as it's DC voltage and cannot go back to the source +? Might be worth testing on one of my shitty LDs pulled from dvd drives
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Old 12-11-2013, 12:38 AM #8
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Default Re: LD died

I'll take pics when I get home. It's one of jufran88s linear lm1117 drivers and is allowing about 109mA through. The diode takes about 2.5V @ 90mA. And I'm using one of mrcrouse's hosts. How do you think I should have it wired?

Strangely if I wire it LD cathode PIN to LD- & use the photodiode anode it lights, but on contact with the case it goes out. (Case negative) as it's shorting out. If I use the LD anode (com pin) it doesn't seem to work
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457.9nm: Argon Ion Line

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473nm: CNI MGL-473-100, CNI GLP-473
476.5nm: Argon Ion Line

483nm Omni-643RYB Whitelight Line
488nm: Argon Ion Line, Spectra Physics >20mW Cyan DECSL Laser, Coherent Sapphire 488-20 OPSL

496.5nm: Argon Ion Line
501.7: Argon Ion Line
514.5nm: Argon Ion Line
520nm: Trustfire A8 Custom

532nm: CNI MGL-F-3W, Coherent Genesis MX Taipan OPSL, LG Hercules-325
543.5nm: 05-LGR-193 Melles Griot HeNe 3.8mW
Melles Griot LGB-563 HeNe

561nm: Melles Griot 85-YCA-015, Coherent Sapphire 561-20
568nm: Omni-643RYB Whitelight Line

577nm: Coherent Genesis MX Taipan OPSL
583.8nm: DPSS line
586.2nm: DPSS line
588.6nm: CNI PGL-M-80

591nm: DPSS line
593.5nm CNI MGL-H-50 Lab Laser
594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm: Raman HeNe line?
611.8nm: Melles Griot LOR-150 HeNe (5mW), LOR-006 HeNe (0.5mW)

632.8nm: Spectra Physics Model-127 (>35mW), Model-124B, Model-120, Model-117, others
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 0.5W

671nm: CNI PGL-III-C-100
676nm: Omni-643RYB Whitelight Line
690nm: custom diode laser
694nm: Portable Q-switched Ruby Laser

1152.6nm: SP-120 HeNe alt. mirrors
1523.5nm: Melles Griot LIR-151 HeNe
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Last edited by ultimatekaiser; 12-11-2013 at 12:41 AM.
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Old 12-11-2013, 12:40 AM #9
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Default Re: LD died

I'm sorry for your loss

I remember when my first diode bit the dust, it hurt.
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Old 12-11-2013, 12:42 AM #10
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Default Re: LD died

Sorry edited and yeah it does :/ I don't wanna kill another.

Edit: I've ordered a few more drivers and supplies, when they get here i'll reattempt this build. hopefully I can get it fully right this time!
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325nm: Omni 2056-M-A01 HeCd
375nm: Melles Griot RCS-007

405nm: Melles Griot RCS
430nm: Coherent D3 430-10
441.6nm: Omnichrome 2056-M-A01/4074-P-A03 HeCd laser
457.9nm: Argon Ion Line

472nm Omni-643RYB Whitelight Line
473nm: CNI MGL-473-100, CNI GLP-473
476.5nm: Argon Ion Line

483nm Omni-643RYB Whitelight Line
488nm: Argon Ion Line, Spectra Physics >20mW Cyan DECSL Laser, Coherent Sapphire 488-20 OPSL

496.5nm: Argon Ion Line
501.7: Argon Ion Line
514.5nm: Argon Ion Line
520nm: Trustfire A8 Custom

532nm: CNI MGL-F-3W, Coherent Genesis MX Taipan OPSL, LG Hercules-325
543.5nm: 05-LGR-193 Melles Griot HeNe 3.8mW
Melles Griot LGB-563 HeNe

561nm: Melles Griot 85-YCA-015, Coherent Sapphire 561-20
568nm: Omni-643RYB Whitelight Line

577nm: Coherent Genesis MX Taipan OPSL
583.8nm: DPSS line
586.2nm: DPSS line
588.6nm: CNI PGL-M-80

591nm: DPSS line
593.5nm CNI MGL-H-50 Lab Laser
594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm: Raman HeNe line?
611.8nm: Melles Griot LOR-150 HeNe (5mW), LOR-006 HeNe (0.5mW)

632.8nm: Spectra Physics Model-127 (>35mW), Model-124B, Model-120, Model-117, others
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 0.5W

671nm: CNI PGL-III-C-100
676nm: Omni-643RYB Whitelight Line
690nm: custom diode laser
694nm: Portable Q-switched Ruby Laser

1152.6nm: SP-120 HeNe alt. mirrors
1523.5nm: Melles Griot LIR-151 HeNe
3391nm: SP-124 alt. mirrors

Last edited by ultimatekaiser; 12-11-2013 at 05:46 AM.
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Old 12-11-2013, 12:37 PM #11
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Default Re: LD died

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Originally Posted by NKO29 View Post
Direct driving kills the diode from over current... Having regulated current bypass the LD (shorting across the pins) should mean that the LD will be UN-Harmed as it's DC voltage and cannot go back to the source +? Might be worth testing on one of my shitty LDs pulled from dvd drives
Direct driving will only kill the diode if you source enough voltage, so a high If will flow when the diode is hot and bang

If you direct drive a a140 on a li-ion, it will barely output 500mW.

I mean that, if you short the LD during operation, and it does not have the appropriate capacitor on its pins (most drivers have) it will die from the spike. Ive seen it happen.


I direct drove a 16x dvd burner diode, with a 10ohm resistor. When I accidentally shorted the leads, it gone LED.

I did the same with another diode, but put a 100nF capacitor soldered behind it (VERY close). I could not kill it from shorting the source.
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Old 12-11-2013, 07:39 PM #12
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Default Re: LD died

"I direct drove a 16x dvd burner diode, with a 10ohm resistor. When I accidentally shorted the leads, it gone LED."

Was that by any chance a wirewound 10 ohm resistor? That would be the only way the scenario you describe would make sense to me. i.e.-x amount of current flowing through resistor and diode then the diode is shorted causing excess current to flow through the resistor (which if it's a WW resistor is also an inductor) then when the short across the diode is removed the inductive nature of WW resistors results in a spike of current through the diode.
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Old 12-11-2013, 07:42 PM #13
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Default Re: LD died

Carbon resistor. 1/4 watt ones.
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Old 12-12-2013, 01:28 AM #14
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Default Re: LD died

how would you wire a case positive diode? thats what I'm really after.
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Old 12-12-2013, 07:08 AM #15
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Default Re: LD died

Quote:
Originally Posted by Leodahsan View Post
Direct driving will only kill the diode if you source enough voltage, so a high If will flow when the diode is hot and bang

If you direct drive a a140 on a li-ion, it will barely output 500mW.

I mean that, if you short the LD during operation, and it does not have the appropriate capacitor on its pins (most drivers have) it will die from the spike. Ive seen it happen.


I direct drove a 16x dvd burner diode, with a 10ohm resistor. When I accidentally shorted the leads, it gone LED.

I did the same with another diode, but put a 100nF capacitor soldered behind it (VERY close). I could not kill it from shorting the source.
That makes sense, i was talking about when it's hooked up to a driver I have actually accidentally shorted LD + & - and they've been fine, but all of DTR's drivers are good quality and have caps so they saved my diodes i guess
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Old 12-12-2013, 07:13 AM #16
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Default Re: LD died

well the driver has a resistor and a couple capacitors on it, but not sure of the capacitive value. the resistor says 100 on it and is black
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