Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Tutorials, Help & Repairs



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 03-05-2010, 04:11 AM #1
Class 4 Laser
 
Join Date: May 2007
Location: Queensland, AU
Posts: 7,549
Rep Power: 1100
Things has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond repute
Things Things is offline
Class 4 Laser
 
Join Date: May 2007
Location: Queensland, AU
Posts: 7,549
Rep Power: 1100
Things has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond repute
Default Why NOT to test your diodes on batteries!

I saw this in the other thread before it got closed.

Quote:
Originally Posted by Ronnie James Diode (Banned)
You people are goofy as hell!!! First off I purposely killed alot of diodes in my own destructive TESTING!!! Using two generic AA batteries is not going to give you that kind of amperage!!! Lithiums yes alkalines no!!!
Which annoys me greatly when people don't back up what they think.

Why? Well the fact that "Using two generic AA batteries is not going to give you that kind of amperage!!!" is total garbage!

Just grab an AA battery, and shove it onto your DMM and measure the current.



Thats 8.8 AMPS! Not something you want to go shoving into your diode!



Last edited by Things; 03-05-2010 at 04:41 AM.
Things is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 03-05-2010, 04:29 AM #2
Class 3B Laser
 
Join Date: Oct 2009
Location: Central New York State - Watkins Glen - planet Earth
Posts: 2,745
Rep Power: 101
photonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond repute
photonaholic photonaholic is offline
Class 3B Laser
 
Join Date: Oct 2009
Location: Central New York State - Watkins Glen - planet Earth
Posts: 2,745
Rep Power: 101
photonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond repute
Default Re: Why NOT to test your diodes on batteries!

Well done...
__________________
Thanks for reading my post.
Kind regards, Wayne

------------------------------------------------------------------
"Disclaimer: all posts made by me are based on my own opinion only,
That opinion is subject to change without notice."


Too much knowledge is dangerous, not enough is worse.
Adapted from Einstein quote.
------------------------------------------------------------------
If you want to burn things, buy a lighter
------------------------------------------------------------------
My Pet Forums - for the animal fans Link
Dances With Reptiles - If you like snakes Link

Last edited by photonaholic; 03-05-2010 at 06:15 AM.
photonaholic is offline   Reply With Quote
Old 03-05-2010, 05:39 AM #3
RJD RJD is offline
Banned
 
Join Date: Mar 2010
Location: In my home for the most part!
Posts: 11
Rep Power: 0
RJD is infamous around these partsRJD is infamous around these partsRJD is infamous around these partsRJD is infamous around these partsRJD is infamous around these parts
Send a message via Yahoo to RJD
RJD RJD is offline
Banned
 
Join Date: Mar 2010
Location: In my home for the most part!
Posts: 11
Rep Power: 0
RJD is infamous around these partsRJD is infamous around these partsRJD is infamous around these partsRJD is infamous around these partsRJD is infamous around these parts
Send a message via Yahoo to RJD
Default Re: Why NOT to test your diodes on batteries!

Quote:
Originally Posted by Things View Post
I saw this in the other thread before it got closed.



Which annoys me greatly when people don't back up what they think.

Why? Well the fact that "Using two generic AA batteries is not going to give you that kind of amperage!!!" is total garbage!

Just grab an AA battery, and shove it onto your DMM and measure the current.



Thats 8.8 AMPS! Not something you want to go shoving into your diode!
You are not getting 8.8 amps from any AA battery! I am not correcting you to argue. I just want to explain to anybody reading this why it is incorrect information!

Ok first thing your trying to read amps on a battery that has less than 1A so you need to switch your DMM to 200m in the dc amp range, Now that your trying to measure the amperage in the correct range you will get a more accurate reading!
Batteries are rated in MILLIAMPS not amps. If it were true that your AA battery had a current of 8.8 amps that would eqaute to 8800 mA. There is no AA battery that I know of that has that kind of amperage!

There is an easy way to check this with or without a meter! If you do not have access to a DMM but know how many milliamps your battery is!
As a milliampere (milliamp or just mA) is 1/1000th of an ampere, we can convert mA to Amps by just dividing by 1000. Another way is to take the current in mA and move the decimal to the left three places to accomplish the division by 1000.
mA / 1000 = Amps

Here is my photo taking a milliamp reading note the position of the selector switch


So this brand new Duracell has 1/4 of 1/1000th of an amp or 25 mA!
This is all easy to prove using the basic rules and formulas that govern electricity. There is no sense and my only intent here was to correct the missinformed in regards to battery amperage!
Here is an example of how to obtain a incorrect reading on a DMM. Using that same Duracell in the pic I switched my DMM to ACV 200 and took a reading, the results 2.5 ACV! This is obviously incorrect that is why you must be sure your taking readings in the correct range!
No slight intended and hopefully no hard feelings
and thanks for reading!

Last edited by RJD; 03-05-2010 at 06:53 AM. Reason: Somebody pointed out a typo
RJD is offline   Reply With Quote
Old 03-05-2010, 05:47 AM #4
JLSE's Avatar
A.R Coated Madman
 
Join Date: Dec 2007
Location: ɯɐǝq ssɐ-ǝʇıɹq ǝɥʇ puıɥǝq
Posts: 3,587
Rep Power: 716
JLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond repute
JLSE JLSE is offline
A.R Coated Madman
JLSE's Avatar
 
Join Date: Dec 2007
Location: ɯɐǝq ssɐ-ǝʇıɹq ǝɥʇ puıɥǝq
Posts: 3,587
Rep Power: 716
JLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond repute
Default Re: Why NOT to test your diodes on batteries!

If you hook in a 1ohm resistor, cap and diode, you will not blow anything..

Straight to the batteries without minimal protection is bad, but not lethal to an LD if done properly (cap,res,diode)..

The problem that occours is with rapidly losing output as the voltage sags on the batteries. Current regulation is obviously the way to go, but you will not fry an open can red at 3v (2xAA), if anything, you wont see more than 225mW


* 16amps to the LD would be intersting though.

"So this brand new Duracell has 1/4 of 1/1000th of an amp or 25 mA!"

*25mA ? You sure thats not 250mA?

Last edited by JLSE; 03-05-2010 at 05:52 AM.
JLSE is offline   Reply With Quote
Old 03-05-2010, 06:34 AM #5
Class 3B Laser
 
Join Date: Oct 2009
Location: Central New York State - Watkins Glen - planet Earth
Posts: 2,745
Rep Power: 101
photonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond repute
photonaholic photonaholic is offline
Class 3B Laser
 
Join Date: Oct 2009
Location: Central New York State - Watkins Glen - planet Earth
Posts: 2,745
Rep Power: 101
photonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond repute
Default Re: Why NOT to test your diodes on batteries!

RJD is gone, so why have his "ghost" hanging around?
__________________
Thanks for reading my post.
Kind regards, Wayne

------------------------------------------------------------------
"Disclaimer: all posts made by me are based on my own opinion only,
That opinion is subject to change without notice."


Too much knowledge is dangerous, not enough is worse.
Adapted from Einstein quote.
------------------------------------------------------------------
If you want to burn things, buy a lighter
------------------------------------------------------------------
My Pet Forums - for the animal fans Link
Dances With Reptiles - If you like snakes Link

Last edited by photonaholic; 03-06-2010 at 02:13 PM.
photonaholic is offline   Reply With Quote
Old 03-05-2010, 06:43 AM #6
lazerov's Avatar
Class 1M Laser
 
Join Date: Sep 2009
Location: Varna, Bulgaria
Posts: 145
Rep Power: 15
lazerov is a splendid one to beholdlazerov is a splendid one to beholdlazerov is a splendid one to beholdlazerov is a splendid one to beholdlazerov is a splendid one to beholdlazerov is a splendid one to beholdlazerov is a splendid one to behold
lazerov lazerov is offline
Class 1M Laser
lazerov's Avatar
 
Join Date: Sep 2009
Location: Varna, Bulgaria
Posts: 145
Rep Power: 15
lazerov is a splendid one to beholdlazerov is a splendid one to beholdlazerov is a splendid one to beholdlazerov is a splendid one to beholdlazerov is a splendid one to beholdlazerov is a splendid one to beholdlazerov is a splendid one to behold
Default Re: Why NOT to test your diodes on batteries!

Quote:
Originally Posted by RJD View Post
You are not getting 8.8 amps from any AA battery! I am not correcting you to argue. I just want to explain to anybody reading this why it is incorrect information!
A short-circuited battery CAN supply that amount of current for a short time. And the battery in the first post is short-circuited. Furthermore, my cell phone jammer draws well over 3Amps and is powered from AAs. Once I accidentally short circuited these batteries and the wires started smoking! Your statement that a brand new alkaline can supply only 25mA is ridiculous.
Quote:
Originally Posted by RJD View Post
Ok first thing your trying to read amps on a battery that has less than 1A so you need to switch your DMM to 200m in the dc amp range, Now that your trying to measure the voltage in the correct range you will get a more accurate reading!
If you switch the DMM to the 200mA range and measure the current of the battery the only thing that will happen is to burn out the fuse of the DMM. And when you are using the 200mA DC current range you are NOT measuring voltage but current (you stated that you are measuring voltage).

Quote:
Originally Posted by RJD View Post
Batteries are rated in MILLIAMPS not amps. If it were true that your AA battery had a current of 8.8 amps that would eqaute to 8800 mA. There is no AA battery that I know of that has that kind of amperage!
Batteries are not rated in mA but in mAh (milliampere-hour) which has nothing to do with the maximum current of the battery. Maximum safe current is rated as "C". For example 10C means that the maximum current draw from a battery with capacity of 400mAh is 4A.
Quote:
Originally Posted by RJD View Post
There is no sense and my only intent here was to correct the missinformed in regards to battery amperage!
If you're so concerned about misinformation, please don't create more of it.

Quote:
Originally Posted by RJD View Post
Here is an example of how to obtain a incorrect reading on a DMM. Using that same Duracell in the pic I switched my DMM to ACV 200 and took a reading, the results 2.5 ACV! This is obviously incorrect that is why you must be sure your taking readings in the correct range!
Do you even know what ACV means? This is not only different range but different type of measurement. OP is correctly measuring in the 10A DC range.
__________________
A140@1.25A - custom portable build
SF-AW210@180mA in Rayfoss focusable host

80mW DX module in SKYlasers pen host
Romisen L-C030 from DX
DX200mW - Old style

Last edited by lazerov; 03-05-2010 at 06:47 AM.
lazerov is offline   Reply With Quote
Old 03-05-2010, 06:49 AM #7
RJD RJD is offline
Banned
 
Join Date: Mar 2010
Location: In my home for the most part!
Posts: 11
Rep Power: 0
RJD is infamous around these partsRJD is infamous around these partsRJD is infamous around these partsRJD is infamous around these partsRJD is infamous around these parts
Send a message via Yahoo to RJD
RJD RJD is offline
Banned
 
Join Date: Mar 2010
Location: In my home for the most part!
Posts: 11
Rep Power: 0
RJD is infamous around these partsRJD is infamous around these partsRJD is infamous around these partsRJD is infamous around these partsRJD is infamous around these parts
Send a message via Yahoo to RJD
Default Re: Why NOT to test your diodes on batteries!

Quote:
Originally Posted by photonaholic View Post
You know, I was thinking the same thing nearly 9 amps from a AA cell??

That would be enough current to cause a light gauge wire to get so hot the insulation would melt and the wire would burn your fingers.

I have only seen that kind of performance from at least a NiCd or NiMh "C" cell or above.

Maybe we can re-work this thread to be more factual and informative before it gleans too many replies.

RJD is gone, so why have his "ghost" hanging around?
BOOOOOOO!!! Sorry for my appearance I was hoping for a second chance here! I do not hold any grudges and have no desire to be disruptive to the forum I like it here and would like to stay if allowed! As far as my s/n I did not want to hide who I was or the fact that I was banned here under the s/n Ronnie James Diode (RJD). It is a shame to see so many usefull threads choked with the typical forum b/s so I am just going to ignore any ignorance and behave as civily as possible!
RJD is offline   Reply With Quote
Old 03-05-2010, 07:14 AM #8
aryntha's Avatar
Class 3R Laser
 
Join Date: Nov 2009
Location: Evergreen, CO
Posts: 2,027
Rep Power: 2778
aryntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond repute
aryntha aryntha is offline
Class 3R Laser
aryntha's Avatar
 
Join Date: Nov 2009
Location: Evergreen, CO
Posts: 2,027
Rep Power: 2778
aryntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond repute
Default Re: Why NOT to test your diodes on batteries!

This may be blasphemy, but I'm just going to mention it; I've actually had good luck testing diodes with a specific LED tester. (multiple slots for multiple milliamp ratings, made for the specific purpose of current-limited LED testing).

It's not a 'driver' per se, but it is a current limited device, it's cheap, convenient, and i've never blown one with one of these.
__________________

3392nm:REO LHIP HeNe 2mW ∙ 980nm:OLIKE 155mW

808nm:OLIKE 200mW ∙ JETL PLC 600mW(682pk)
780nm:OLIKE 120mW
685nm:18650 47mW
671nm:PGL3M 281mW DPSS ∙ PGL3C 278mW
655nm:LOC 254mW ∙ OLIKE 221mW ∙ Yob 320mW
638nm:Sanyo 40mW ∙ HL63133 200mW ∙ PGL3C 463mWpk ∙ ML520 700mW
633nm:JDS1145 HeNe 28mW ∙ JDS1145 HeNe 26mW
612nm:MG 05LOR151 HeNe 3mW ∙ REO LSTP 3mW
609nm:REO LHOR 1mW
604nm:REO LSTP 2mW
594nm:Rigel 3mW ∙ LG PGL3C 15mWpk ∙ Lasos 7512 3mW ∙ CNI MGL3 58mWpk
589nm:CNI PGL3C 106mW ∙ CNI PGL3C 85mW
561nm:CNI PGL3C 30mW(41pk)
556nm:CNI PGL3C 20mW(22pk)
544nm:JDS1675P HeNe 2mW ∙ REO LHGR 2mW ∙ Lasos 7786 2mW
532nm:PGL3C 150mW(180pk) ∙ PGL3C 578mWpk ∙ PLC 440mWpk
515nm:JDS 221420GL ArI 30mW
510nm:52mW DG#2 ∙ 50mW 26650 DG
488nm:Nlx DPSS 7mW ∙ JDS 2214 ArI 40mW ∙ JDS FCD488 DPSS 25mW
ML:MG 65A106025 ArI ML 115mW
476/480nm:Nichia Diode 28mW
473nm:PGL3A 45mW(80pk) ∙ PGL3C 110mWpk ∙ PGL3C 95mWpk ∙ RPLB-25 60mWpk
465nm:DTR NDB7676 2.03w
458nm:JDS 2214VL ArI 8mW ∙ JDS 2214VL ArI 12mW ∙ RHD Diode 1.7W
452nm:Osram SM 47mW
445nm:Yob 1410mW ∙ Polaris 156mW ∙ PGL3C 1200mW ∙ DTR-EHG 32650 2136mW
405nm:Yob 630mW ∙ Qfox 750mW ∙ JETL PLC 780mW
aryntha is offline   Reply With Quote
Old 03-05-2010, 07:44 AM #9
Class 4 Laser
 
Join Date: May 2007
Location: Queensland, AU
Posts: 7,549
Rep Power: 1100
Things has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond repute
Things Things is offline
Class 4 Laser
 
Join Date: May 2007
Location: Queensland, AU
Posts: 7,549
Rep Power: 1100
Things has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond repute
Default Re: Why NOT to test your diodes on batteries!

No, I know perfectly why it was reading 8A. This was a fresh cell, and this was a DIRECT SHORT.

I have no doubt this thing was doing 8A, the battery started getting warm a few seconds after connecting it, thus why the picture was blurred. I had to do it quickly before I had a pipe bomb in my hands.

With some laser diodes, you may be saved by internal resistance, and in some cases not, so it's best just to not do it.

If your batteries only supply 250ma shorted, I think you may need to check how long they have been sitting on the shelf!

May I also point out that you had the DMM probe plugged into the wrong input. In your pic, it's plugged into the 10A plug.
Please learn how to at least use your DMM before you start coughing up more incorrect information.

The one underneath it says "V(Ohms)mA", thats the one you want. The 10A socket is essentially shorted to your - probe.

Aryntha: I have tested diodes using a LED tester as well fine, but that is in no way a direct connection to the battery, and typically the highest current rating is 50mA.

Lazerov is correct. Batteries are rated in mAh. If a battery is 2000mAh, this means it can supply, under normal conditions, 2A for 1 hour. If you connect it to a laser diode directly for a few seconds, it's very likely the diode is going to get a huge current surge!

Last edited by Things; 03-05-2010 at 07:56 AM.
Things is offline   Reply With Quote
Old 03-05-2010, 08:34 AM #10
HIMNL9's Avatar
Class 4 Laser
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
HIMNL9 HIMNL9 is offline
Class 4 Laser
HIMNL9's Avatar
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
Talking Re: Why NOT to test your diodes on batteries!

DMMs have different internal resistances, in different scales, you know ?

On 10A scale, some of them have 0.1 ohm, some others 0.05 ohm, and the better ones 0.01ohm, but at any effect, on a direct measure of this type, is a short circuit ..... and yes, fresh alkaline cells can give you so much amperes, also if just for few minutes (but considering that, for burn a LD, you just need a fraction of second, at that current, it's more than enough )

All the primary cells have two parameters, the nominal current-per-hour (Ma/h or A/h), that is the current that a cell can give you constantly for an entire hour, and a (never declared, usually), maximum short-current, that is the maximum current that the cell can give you in short-circuit conditions (and that, usually, kills the cell, with very few exceptions) ..... an AA cell, alkaline of good quality, can really easily give you 8 or 10 A for a minute or two, also if this ofcourse kill the cell ..... an exception that i've found, as example, is the Gates 2V Pb cells, where a 5A cell can give 500A for 30 seconds (yes, 500A), and still survive ..... so, never underestimate the quantity of energy that you can get from a cell, especially with delicate and expensives LDs

BTW, you know the "bomb-battery" ? ..... years ago we do that as joke ..... taking a half-dead D duracell alkaline, shorting it with a piece of wire soldered on the poles, and placing it somewhere ..... also if half deads, they still had enough current for become boiling in some minutes, exploding at the end with a decent loud
__________________
High Impulse Multipath Neutron Laser (mark 9 ) (LOL)
Dare mo mita koto no nai, kaze, kumo, suna, umi ..... Kokoro no hate no doko ka eien ga kagayaku.
HIMNL9 is offline   Reply With Quote
Old 03-05-2010, 09:08 AM #11
Class 2M Laser
 
Join Date: Feb 2008
Posts: 733
Rep Power: 83
hydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond repute
hydrogenman15 hydrogenman15 is offline
Class 2M Laser
 
Join Date: Feb 2008
Posts: 733
Rep Power: 83
hydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond repute
Default Re: Why NOT to test your diodes on batteries!

I just tested a couple batteries on my DMM.
One was a alkaline aaa that had already been used quite a few times and read a voltage 1.4. It put out just over 2 amps. Another was a aaa alkaline that was 1.3v and it put out over three amps. I also tested two rechargeable aa's and they both put out over 10 amps.

The thing I'm wondering is, if aa's and aaa's can only put out 25mA's then how could a DPSS green pen laser be able to produce >100mW's green light? They cannot go above 50% efficiency if I remember correctly. Thats just my 2 cents.

--Hydro15
hydrogenman15 is offline   Reply With Quote
Old 03-05-2010, 09:09 AM #12
JLSE's Avatar
A.R Coated Madman
 
Join Date: Dec 2007
Location: ɯɐǝq ssɐ-ǝʇıɹq ǝɥʇ puıɥǝq
Posts: 3,587
Rep Power: 716
JLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond repute
JLSE JLSE is offline
A.R Coated Madman
JLSE's Avatar
 
Join Date: Dec 2007
Location: ɯɐǝq ssɐ-ǝʇıɹq ǝɥʇ puıɥǝq
Posts: 3,587
Rep Power: 716
JLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond repute
Default Re: Why NOT to test your diodes on batteries!

"2A for 1 hour."

How do you get this number? 2A?

Ive tried direct batteries many times on different reds and even IR's, lol the diode will not see 2A. The red sees less than the IR with the lower voltage requirements. This was hooked straight to the LD, no resistor, nothing...

The availible current is dependant on the voltage of the load. If the voltage draw exceeds the 3v of two AA's the current becomes less and less.

Have you actually tested this?
__________________
Recent Projects:
-----

Last edited by JLSE; 03-05-2010 at 09:20 AM.
JLSE is offline   Reply With Quote
Old 03-05-2010, 09:16 AM #13
Class 4 Laser
 
Join Date: May 2007
Location: Queensland, AU
Posts: 7,549
Rep Power: 1100
Things has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond repute
Things Things is offline
Class 4 Laser
 
Join Date: May 2007
Location: Queensland, AU
Posts: 7,549
Rep Power: 1100
Things has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond repute
Default Re: Why NOT to test your diodes on batteries!

hydrogenman15, they don't put out 25mA, thats how

Wannaburn: Thats what mAh stands for, whether the manufacturer is telling the truth or talking crap is out of my hands.
Things is offline   Reply With Quote
Old 03-05-2010, 09:34 AM #14
JLSE's Avatar
A.R Coated Madman
 
Join Date: Dec 2007
Location: ɯɐǝq ssɐ-ǝʇıɹq ǝɥʇ puıɥǝq
Posts: 3,587
Rep Power: 716
JLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond repute
JLSE JLSE is offline
A.R Coated Madman
JLSE's Avatar
 
Join Date: Dec 2007
Location: ɯɐǝq ssɐ-ǝʇıɹq ǝɥʇ puıɥǝq
Posts: 3,587
Rep Power: 716
JLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond reputeJLSE has a reputation beyond repute
Default Re: Why NOT to test your diodes on batteries!

Im reffering to what happens when you hook up a LD to 2 AA batteries, not what the battery can do..

If the diode saw 2A, the entire kipkay flashlight hack would not have been so popular..
If your saying that the red LD sees 2 A, it wouldnt live past the first click of the switch.

Im not at any point saying its a good idea, which I reffered to in my first post. But doing so does not spell instant death for an LD.

I made a couple of pens back in the day, straight to 2xAAA's, and have even tried with 10440's and CR123A's.

Again, a really bad idea, but theres no sudden drop of current on the LD.

Even the 3.6v can only deliver 550-600mA on a fresh charge. Excluding anything larger than the CR123A, bigger battery, bigger current.

That said, the title 'Why NOT to test your diodes on batteries! ' is not valid as the LD never sees that kind of current.
__________________
Recent Projects:
-----

Last edited by JLSE; 03-05-2010 at 09:37 AM.
JLSE is offline   Reply With Quote
Old 03-05-2010, 09:40 AM #15
Class 4 Laser
 
Join Date: May 2007
Location: Queensland, AU
Posts: 7,549
Rep Power: 1100
Things has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond repute
Things Things is offline
Class 4 Laser
 
Join Date: May 2007
Location: Queensland, AU
Posts: 7,549
Rep Power: 1100
Things has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond repute
Default Re: Why NOT to test your diodes on batteries!

Yes, while the diodes may survive in a few cases, if you read through the RJD thread you will see why I started this thread. If someone bought a diode from you, connected it to AA batteries and killed it, then complained to you about you not shipping it properly etc, you can see why it's best if you DON'T do it.

It also depends largely on the battery. Some may have much lower internal resistance than others, which will mean instant death to your diode.
Things is offline   Reply With Quote
Old 03-05-2010, 09:48 AM #16
HIMNL9's Avatar
Class 4 Laser
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
HIMNL9 HIMNL9 is offline
Class 4 Laser
HIMNL9's Avatar
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
Default Re: Why NOT to test your diodes on batteries!

mAh ..... Yes, that is usually the only data that the manufacturers say you (other than the voltage, ofcourse ) ..... mAh is the maximum current that, nominally, a fresh, new cell can give you for a whole hour, without burn or become damaged.

In the case of most of the "new" 2700mAh Ni-Mh cells, as example, it means that these cells, fully charged (when new and in good conditions), can give you a maximum of 2700mA (or 2,7A) for an entire hour, before become too much discharged, and still remain in good conditions (that means, you can recharge them and reuse them again, after you've left them cool down)

Ofcourse, this don't mean that the same cell can give you ONLY 2700mA maximum current ..... an AA size 2700mAh cell can, almost safely, give you 5000mA (5A) for half hour, becoming more hot and shortening the life cycle around half times ..... can give you almost 10A for approximatively 8 or 10 minutes (but it become boiling, and may become too much damaged for recharge it more than other 10 times, if you're lucky) ..... and can give you easily from 15 to 20A for a minute, but in this case the cell become burning, completely die at the end, and there's a good 50% of possibility that in a minute or few more it just blow in your hands, if the safety seal fails to melt and release the gas.

But the main problem, imho, is that the manufacturers never say these things, on their products ..... they just place a generic "do not short circuit" advice on the cells, without explain good the related risks (only on Li-Ion and Li-based cells there is some more advice, cause these cells can explode like incendiary bombs, in determinated conditions)
__________________
High Impulse Multipath Neutron Laser (mark 9 ) (LOL)
Dare mo mita koto no nai, kaze, kumo, suna, umi ..... Kokoro no hate no doko ka eien ga kagayaku.
HIMNL9 is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


LinkBacks (?)
LinkBack to this Thread: http://laserpointerforums.com/f51/why-not-test-your-diodes-batteries-48805.html
Posted By For Type Date
help needed from the laser gurus | BudgetLightForum.com This thread Refback 12-26-2013 10:55 PM










Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 04:19 AM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC