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





One laser store meets all your needs

Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > 445nm Lasers





Reply
 
LinkBack Thread Tools Display Modes
Old 05-23-2014, 07:13 PM #1
Class 1M Laser
 
Join Date: May 2011
Location: New York
Posts: 218
Rep Power: 57
petters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond repute
petters petters is offline
Class 1M Laser
 
Join Date: May 2011
Location: New York
Posts: 218
Rep Power: 57
petters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond repute
Default Solved -Anyone else experience a diode this inefficient?

I decided to actually start putting some stuff together so that the last thing I would need is a driver. I assumed that around 5-7V would be the reasonable range for a 9mm 445nm (NDB7875) to draw 2.3A. Of course I plan on using a CC driver, but I decided to run a little test on the diode.



Now before anyone says anything about the driver I am using to run the test, it is not that bad of a driver. I have checked the output on an oscilloscope and it is surprisingly clean. Now, that aside, 8V for 2.3A? So much for 7.4V to power this thing , will obviously have to use another diode but just wanted to see if I am alone in having a dud for this specific diode.



Last edited by petters; 05-24-2014 at 12:42 AM.
petters is offline   Reply With Quote


















Old 05-23-2014, 09:20 PM #2
IWIRE's Avatar
Class 2M Laser
 
Join Date: Dec 2013
Location: Oklahoma
Posts: 630
Rep Power: 248
IWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond repute
IWIRE IWIRE is offline
Class 2M Laser
IWIRE's Avatar
 
Join Date: Dec 2013
Location: Oklahoma
Posts: 630
Rep Power: 248
IWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond repute
Default Re: Anyone else experience a diode this inefficient?

I didn't even know that diode could withstand that voltage. Mine are usually right about
5v @ 2.4a. What is the diodes output in mw ? Have you double checked with a different meter ? That would freak me out. I would have stopped long before even 6v and thought I had a problem.
Are you sure that setup is good ? I had one like it I got from Ebay, that thing would read all kinds of crazy stuff and none of it was right.
__________________

He said "Let there be light !",
and there was,
and it was good.
So we amplified it.

Last edited by IWIRE; 05-23-2014 at 09:29 PM.
IWIRE is offline   Reply With Quote
Old 05-23-2014, 09:22 PM #3
Blackwolf's Avatar
Class 2 Laser
 
Join Date: Jul 2013
Location: Wisconsin
Posts: 345
Rep Power: 67
Blackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond repute
Blackwolf Blackwolf is offline
Class 2 Laser
Blackwolf's Avatar
 
Join Date: Jul 2013
Location: Wisconsin
Posts: 345
Rep Power: 67
Blackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond reputeBlackwolf has a reputation beyond repute
Default Re: Anyone else experience a diode this inefficient?

is the output like this? Super inefficient M140.
__________________
445nm "1W+" Polished Survival Lasers S4
450nm ???
470nm 5W custom polished MrCrouse tactical
473nm "5mW" Custom polished CNI glp-473
488nm WTB multi-line
515nm "30mw" Joker301 GB C6
520nm 1W Custom host? (2016)
543nm HeNe (WTB)
589nm (WTB PGL III C/Spartan)
594nm (WTB pen)
604nm or 612nm (want eventually)
633nm HeNe (2016)
635nm 345mW "Zraffle" Lazerer Rifle
685nm 35mW MXDL laser (2015)
3.7W Lpm Radiant X4 LPM with blue case (2015)
Blackwolf is offline   Reply With Quote
Old 05-23-2014, 09:42 PM #4
Class 1M Laser
 
Join Date: May 2011
Location: New York
Posts: 218
Rep Power: 57
petters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond repute
petters petters is offline
Class 1M Laser
 
Join Date: May 2011
Location: New York
Posts: 218
Rep Power: 57
petters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond repute
Default Re: Anyone else experience a diode this inefficient?

Quote:
Originally Posted by IWIRE View Post
I didn't even know that diode could withstand that voltage. Mine are usually right about
5v @ 2.4a. What is the diodes output in mw ? Have you double checked with a different meter ? That would freak me out. I would have stopped long before even 6v and thought I had a problem.
Are you sure that setup is good ? I had one like it I got from Ebay, that thing would read all kinds of crazy stuff and none of it was right.
Yeah I might have to check it against my actual multimeter to be sure it isn't just an issue with this driver, which seemed to be working well since I hooked it up to a 1 ohm resistor and the current matched the voltage.

Quote:
Originally Posted by Blackwolf View Post
is the output like this? Super inefficient M140.
Haha actually checked that thread to see where the issue may lie. Here are the raw outputs, at 0.5A and 2.3A:



I thought they were clean

Last edited by petters; 05-23-2014 at 09:43 PM.
petters is offline   Reply With Quote
Old 05-24-2014, 12:29 AM #5
Class 1M Laser
 
Join Date: May 2011
Location: New York
Posts: 218
Rep Power: 57
petters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond repute
petters petters is offline
Class 1M Laser
 
Join Date: May 2011
Location: New York
Posts: 218
Rep Power: 57
petters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond reputepetters has a reputation beyond repute
Default Re: Anyone else experience a diode this inefficient?

Welp just threw another diode onto it and it gets the exact same results....

Edit: Could it be the wiring? I mean at such a current there could be a significant voltage drop over such a long wire, right? Wire length is about half a meter for both terminals.... lol might be the issue here

.........ISSUE SOLVED, wire length was the issue

Last edited by petters; 05-24-2014 at 12:42 AM.
petters is offline   Reply With Quote
Old 05-24-2014, 01:08 AM #6
IWIRE's Avatar
Class 2M Laser
 
Join Date: Dec 2013
Location: Oklahoma
Posts: 630
Rep Power: 248
IWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond repute
IWIRE IWIRE is offline
Class 2M Laser
IWIRE's Avatar
 
Join Date: Dec 2013
Location: Oklahoma
Posts: 630
Rep Power: 248
IWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond reputeIWIRE has a reputation beyond repute
Default Re: Solved -Anyone else experience a diode this inefficient?

Ha ! Cool ! Glad you got it sorted out ! Thanks for posting what you found. REP +1
Flaminpyro had warned me about wire length causing problems with certain drives. I try to keep them short now. Great troubleshooting. That's one of the things that I find fun about this hobby. There are always opportunities for solutions
__________________

He said "Let there be light !",
and there was,
and it was good.
So we amplified it.
IWIRE is offline   Reply With Quote
Old 05-24-2014, 03:09 AM #7
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 3157
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is offline
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 3157
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: Solved -Anyone else experience a diode this inefficient?

Hey Petters, you can calculate the voltage drop as a function of wire resistance using a chart like this. I'd be curious to hear how much voltage you were dropping. If you're using some 26 gauge wire like that silicone wire sold by FlamingPyro, 0.5m (1.6ft) would be about 0.067ohm resistance. At 2.3A, that's only a 0.1541 volt drop, which isn't huge, all things considered.
__________________
You must spread some Reputation around before giving it to <person> again.
Bionic-Badger 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











Loading
















Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 09:56 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