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 08-13-2010, 09:03 PM #1
Junior Member
 
Join Date: Jul 2010
Location: Norwich UK
Posts: 5
Rep Power: 0
Andysparks is on a distinguished road
Andysparks Andysparks is offline
Junior Member
 
Join Date: Jul 2010
Location: Norwich UK
Posts: 5
Rep Power: 0
Andysparks is on a distinguished road
Default Diodes going LED

Hi guys, Im having some problems with LD's going LED after only being used a few times. This is my first laser but I don't want to keep having to change the diode.
The LD's im using are Rohm RLD65PzB5 Reds with the current measured on the battery side of the driver of 190mA, allowing about 20mA for the driver the LD should only be getting 170mA which is well below the manufacturers max rating of 200mA. I would have thought it should have a good life at this setting.
Could it be due to the diode overheating ?
There are pics on my post in the welcome thread.
Any ideas will be much appreciated.
Thanks.

Hello everyone from the UK



Last edited by Andysparks; 08-13-2010 at 09:09 PM. Reason: I just found out how to post link
Andysparks is offline   Reply With Quote







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







Old 08-13-2010, 09:10 PM #2
pullbangdead's Avatar
Class 3R Laser
 
Join Date: Aug 2007
Posts: 2,045
Rep Power: 238
pullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond repute
pullbangdead pullbangdead is offline
Class 3R Laser
pullbangdead's Avatar
 
Join Date: Aug 2007
Posts: 2,045
Rep Power: 238
pullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond repute
Default Re: Diodes going LED

What kind of driver is it?

It's usually a better idea to measure the current on the diode side (depending on what kind of driver it is, of course) to see what the diode is actually getting, rather than trying to guesstimate what current the driver is taking.
pullbangdead is offline   Reply With Quote
Old 08-13-2010, 09:32 PM #3
Junior Member
 
Join Date: Jul 2010
Location: Norwich UK
Posts: 5
Rep Power: 0
Andysparks is on a distinguished road
Andysparks Andysparks is offline
Junior Member
 
Join Date: Jul 2010
Location: Norwich UK
Posts: 5
Rep Power: 0
Andysparks is on a distinguished road
Default Re: Diodes going LED

This is the driver im using. Should i use a dummy load to set the current or measure it directly. Is there a risk of blowing the LD from intermittent connections while measuring current with a multimeter on the diode side of the driver.
Attached Thumbnails
Diodes going LED-driver.jpg  
Andysparks is offline   Reply With Quote
Old 08-24-2010, 05:50 AM #4
Banned
 
Join Date: Aug 2010
Posts: 36
Rep Power: 0
onion is on a distinguished road
onion onion is offline
Banned
 
Join Date: Aug 2010
Posts: 36
Rep Power: 0
onion is on a distinguished road
Default Re: Diodes going LED

Are you using the same driver or do you have a couple of them experiencing the same problem?
If only one I would think maybe a bad pot. A bad spot might have less resistance thereby allowing more current to pass. You might not even have time to notice it before poof!

Just a thought.

Rule #1 in shooting trouble, divide and conquer.
Rule #2 - compare with another.

Onion
onion 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








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 05:10 PM.


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