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 12-09-2010, 08:26 AM #17
nkgamer1990's Avatar
Class 2 Laser
 
Join Date: Apr 2009
Location: sausalito
Posts: 435
Rep Power: 655
nkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond repute
nkgamer1990 nkgamer1990 is offline
Class 2 Laser
nkgamer1990's Avatar
 
Join Date: Apr 2009
Location: sausalito
Posts: 435
Rep Power: 655
nkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond repute
Default Re: ddl circuit resistor values

Hey so reffering to my first question, using this circuit, would it be safe to change the current while the circuit is powered?
-Nicholas


__________________
405nm dilda phr 100mw
405nm c6 12x 440mw
445nm a140 custom lab 1500mw
445nm a140 c6 1500mw
473nm bw tek lab 10mw
532nm needle beam 50mw
532nm olike 480mw
532nm lasever 960mw lab unit
638nm custom 700mw lab unit
650nm rifle 250mw
rgb projector 638nm 532nm 445nm
nkgamer1990 is offline   Reply With Quote







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







Old 12-09-2010, 02:47 PM #18
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,141
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: 9,141
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: ddl circuit resistor values

Yes, if you use a pot with the wiper and one end shorted.
__________________
A problem well stated is a problem half solved.
Cyparagon is online now   Reply With Quote
Old 12-09-2010, 05:43 PM #19
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 1792
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 online now
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 1792
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: ddl circuit resistor values

Quote:
Originally Posted by nkgamer1990 View Post
Hey so referring to my first question, using this circuit, would it be safe to change the current while the circuit is powered?
-Nicholas
You can, but pots are mechanical devices and it might result in a momentary short/open circuit that could cause damage to your laser. Depending on the design of the pot, especially surface mount types which may not have a wiper stopper, it may switch from the highest resistance instantly to the lowest if you pass the end of the range. I always turn off the laser before adjusting and do a quick test of the resistance. It's also a good way to determine if you're at the top range of the output current you want to give to the laser, especially if you don't have a laser power meter to determine the output power.

For the wattage of your resistor/pot, remember that the voltage across the resistor/pot for regulating the current is only (and always) 1.2-1.25V, so if you need 1 amp of output power, a 2W resistor/pot will be sufficient. Download the LM317's datasheet and do the math yourself with Ohm's law to confirm; it's the best way.
Bionic-Badger is online now   Reply With Quote
Old 12-10-2010, 03:30 PM #20
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,141
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: 9,141
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: ddl circuit resistor values

Or use this site.
__________________
A problem well stated is a problem half solved.
Cyparagon is online now   Reply With Quote
Old 12-11-2010, 06:10 AM #21
nkgamer1990's Avatar
Class 2 Laser
 
Join Date: Apr 2009
Location: sausalito
Posts: 435
Rep Power: 655
nkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond repute
nkgamer1990 nkgamer1990 is offline
Class 2 Laser
nkgamer1990's Avatar
 
Join Date: Apr 2009
Location: sausalito
Posts: 435
Rep Power: 655
nkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond reputenkgamer1990 has a reputation beyond repute
Default Re: ddl circuit resistor values

the drivers max output would be 1.4 amps with a a130 diode as a load.
im not worried about it jumping to max current. it does have to be adjustable while in use.
-Nicholas
__________________
405nm dilda phr 100mw
405nm c6 12x 440mw
445nm a140 custom lab 1500mw
445nm a140 c6 1500mw
473nm bw tek lab 10mw
532nm needle beam 50mw
532nm olike 480mw
532nm lasever 960mw lab unit
638nm custom 700mw lab unit
650nm rifle 250mw
rgb projector 638nm 532nm 445nm
nkgamer1990 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 03:23 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