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 06-26-2015, 03:57 AM #1
Junior Member
 
Join Date: Jun 2015
Posts: 2
Rep Power: 0
Wurdene is on a distinguished road
Wurdene Wurdene is offline
Junior Member
 
Join Date: Jun 2015
Posts: 2
Rep Power: 0
Wurdene is on a distinguished road
Question Diode not drawing more than 100mA of current

Hi all, I recently purchased an Osram PL520 inside of heatsink assembly, and when I power it via my adjustable power supply, it is drawing ~105mA max @6.9V when I am allowing ~200mA. I have been working with basic electronics for a while, but am entirely new to lasers. Datasheet is specifying a typical operating current of 150mA. This may be a moronic question, but I am too afraid to experiment and burn this $40 diode.


Wurdene is offline   Reply With Quote







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







Old 06-26-2015, 04:28 AM #2
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,144
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,144
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: Diode not drawing more than 100mA of current

Double check polarity, heat sinking, and be sure light is coming out the front. Assuming these are okay:

You must be new to bench PSUs, or at least new to constant current. You are operating your supply in constant voltage. If you are sure the current limit is at 200mA (digital set-point, for example), then simply increase the voltage. If you are not 100% sure the current set-point is 200mA, lower the current set-point to zero or near zero. Increase the voltage to what you're sure is over the operating voltage of the laser. 8V+ in this case. (Note, the voltage readout may or may not rise at this point. That's okay.) Then raise the current set-point to whatever current you need.

Between voltage and current, a bench supply limits to the lower of the two setpoints.
__________________
A problem well stated is a problem half solved.
Cyparagon is online now   Reply With Quote
Old 06-26-2015, 04:45 AM #3
Junior Member
 
Join Date: Jun 2015
Posts: 2
Rep Power: 0
Wurdene is on a distinguished road
Wurdene Wurdene is offline
Junior Member
 
Join Date: Jun 2015
Posts: 2
Rep Power: 0
Wurdene is on a distinguished road
Default Re: Diode not drawing more than 100mA of current

Thank you! This worked for me. I was having no problems previously but didn't want to go any further incase the diode was damaged or something.
Wurdene is offline   Reply With Quote
Old 06-26-2015, 10:47 PM #4
Pman's Avatar
Class 3B Laser
 
Join Date: Nov 2012
Location: Rochester, NY
Posts: 4,373
Rep Power: 12127
Pman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond repute
Pman Pman is offline
Class 3B Laser
Pman's Avatar
 
Join Date: Nov 2012
Location: Rochester, NY
Posts: 4,373
Rep Power: 12127
Pman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond reputePman has a reputation beyond repute
Default Re: Diode not drawing more than 100mA of current

Nice of you to jump in and help a very new member Cyp
__________________
I'm not strange, I'm limited edition!

*Jayrob Star Trek Phaser*
# of Lasers - ***
# of DTR/510 laser adapters *
# of eGo/510 mods **
# of Batteries - ***
Wavelengths - 405, 445, 447, 450, 455, 462, 464, 470, 473, 473+, <515, 515, 520, 532, 589, 635, 638, 650, 660, 685, 808, 830, 980
Projector - PD2
O-Like mini red/green to yellow module
Beam Expanders - Dragon Lasers 2x & 5x with universal adapters
LPM's - Modified AW TEC, Custom 6.8W+ Ophir
Datalogger - ARG
Chargers - Ultrafire WF139, (2) Xtar WP2, Nitecore i2, UM20, (3) i4, (2) D4 , Opus BTC-3400 V2.2
Phlatlights - Jayrob PT-54 green 1000lm maglight, PT-54 red project box build, (3) PT-54 red, (2) PT-54 orange (3) PT-121 red, (2) PT-121 blue, (1) PT-121 green project work in progress 5000lm (1) PT-121 green

Links:

**"Pen Laser Thread"**
"Post your pics of unique builds no-one else has"
"Make your way overspec $5 pen focusable"
"Share your inexpensive builds thread"
"Pman special"
Pman 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 07:44 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