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 > Experiments & Modifications



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



Reply
 
LinkBack Thread Tools Display Modes
Old 01-29-2008, 03:37 AM #1
adgmeijin's Avatar
Class 2 Laser
 
Join Date: Oct 2007
Location: Pasay, Manila, Philippines
Posts: 320
Rep Power: 11
adgmeijin is on a distinguished road
adgmeijin adgmeijin is offline
Class 2 Laser
adgmeijin's Avatar
 
Join Date: Oct 2007
Location: Pasay, Manila, Philippines
Posts: 320
Rep Power: 11
adgmeijin is on a distinguished road
Default actual CURRENT? after the dead LD and resistor dum

im asking if the actual current is the same as the current got in the dead LD and resistor DMM test?


adgmeijin is offline   Reply With Quote







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







Old 01-29-2008, 04:00 AM #2
Class 3R Laser
 
Join Date: Dec 2007
Posts: 1,918
Rep Power: 117
chido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond repute
chido chido is offline
Class 3R Laser
 
Join Date: Dec 2007
Posts: 1,918
Rep Power: 117
chido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond repute
Default Re: actual CURRENT? after the dead LD and resistor

Yes, whatever current measurements you get from a dead LD will be the same as the ones you'd get from a normal one. Although, just to be safe, after testing I wouldn't just solder the new diode without adjusting the current again.
chido is offline   Reply With Quote
Old 01-29-2008, 04:03 AM #3
Class 3R Laser
 
Join Date: Dec 2007
Posts: 1,918
Rep Power: 117
chido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond repute
chido chido is offline
Class 3R Laser
 
Join Date: Dec 2007
Posts: 1,918
Rep Power: 117
chido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond repute
Default Re: actual CURRENT? after the dead LD and resistor

Wait, so you tested it without a load? :-?
chido is offline   Reply With Quote
Old 01-29-2008, 04:06 AM #4
adgmeijin's Avatar
Class 2 Laser
 
Join Date: Oct 2007
Location: Pasay, Manila, Philippines
Posts: 320
Rep Power: 11
adgmeijin is on a distinguished road
adgmeijin adgmeijin is offline
Class 2 Laser
adgmeijin's Avatar
 
Join Date: Oct 2007
Location: Pasay, Manila, Philippines
Posts: 320
Rep Power: 11
adgmeijin is on a distinguished road
Default Re: actual CURRENT? after the dead LD and resistor

you mean i will marked up the current adjustment in the dead LD, and then before i put the new LD, i will star again to higher resistance of the trimpot then try to reach the mark in the trimpot for the same current , right?
adgmeijin is offline   Reply With Quote
Old 01-29-2008, 04:07 AM #5
Class 3R Laser
 
Join Date: Dec 2007
Posts: 1,918
Rep Power: 117
chido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond repute
chido chido is offline
Class 3R Laser
 
Join Date: Dec 2007
Posts: 1,918
Rep Power: 117
chido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond repute
Default Re: actual CURRENT? after the dead LD and resistor

Well you got the idea, but I'd rather use a multimeter to measure the current istead of making a mark on the pot, just to be safer.
chido is offline   Reply With Quote
Old 01-29-2008, 04:12 AM #6
adgmeijin's Avatar
Class 2 Laser
 
Join Date: Oct 2007
Location: Pasay, Manila, Philippines
Posts: 320
Rep Power: 11
adgmeijin is on a distinguished road
adgmeijin adgmeijin is offline
Class 2 Laser
adgmeijin's Avatar
 
Join Date: Oct 2007
Location: Pasay, Manila, Philippines
Posts: 320
Rep Power: 11
adgmeijin is on a distinguished road
Default Re: actual CURRENT? after the dead LD and resistor

i will answer your first question about the test without a load, yes i test it without a load with multimeter probe on its output without LED and i got higher than 3 volts at a current of 210. and for your second reply, i gonna ask if you mean the same way test as the dead LD and resistor to new LD? do i need to attach a resistor again befor the test for the new one?
adgmeijin is offline   Reply With Quote
Old 01-29-2008, 04:23 AM #7
Class 3R Laser
 
Join Date: Dec 2007
Posts: 1,918
Rep Power: 117
chido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond repute
chido chido is offline
Class 3R Laser
 
Join Date: Dec 2007
Posts: 1,918
Rep Power: 117
chido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond repute
Default Re: actual CURRENT? after the dead LD and resistor

You'll never get the right readings if you test your driver without a load, that's why you have to use 4 1N4001 silicon diodes, or a dead LD to simulate a working LD, the best choice would be a dead LD as it has the same resistance as a normal one.
Now, after you test the circuit to make sure it's working properly, you take your new LD and solder the capacitor and two wires directly to its leads to make sure it doesn't disconnect. Then you solder your negative wire coming from the LD to your driver, and then you take the resistor and place it between the positive wire of the diode and the one from the driver.
Turn your pot to maximum resistance, place your test prbes on both sides of the resistor (positive probe between resistor and driver, and negative between LD and resistor) (also make sure the multimeter is set to mV) Then set the desired current by looking at the mV and dividing them by the resistance of the resistor.
chido is offline   Reply With Quote
Old 01-29-2008, 04:30 AM #8
adgmeijin's Avatar
Class 2 Laser
 
Join Date: Oct 2007
Location: Pasay, Manila, Philippines
Posts: 320
Rep Power: 11
adgmeijin is on a distinguished road
adgmeijin adgmeijin is offline
Class 2 Laser
adgmeijin's Avatar
 
Join Date: Oct 2007
Location: Pasay, Manila, Philippines
Posts: 320
Rep Power: 11
adgmeijin is on a distinguished road
Default Re: actual CURRENT? after the dead LD and resistor

ok i understand its the same way test for that, do i need to put out the resistor after i got the right current? and another about the voltage why is it higher than 3v without a load on driver output, is it dangerous to the LD when the power run through the output?
adgmeijin is offline   Reply With Quote
Old 01-29-2008, 04:34 AM #9
Class 3R Laser
 
Join Date: Dec 2007
Posts: 1,918
Rep Power: 117
chido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond repute
chido chido is offline
Class 3R Laser
 
Join Date: Dec 2007
Posts: 1,918
Rep Power: 117
chido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond repute
Default Re: actual CURRENT? after the dead LD and resistor

Yes, take out the resistor after you set the current. And don't worry about voltage, just worry about the current. Like I said, you didn't get the right readings since you measured without a load.
chido is offline   Reply With Quote
Old 01-29-2008, 04:40 AM #10
adgmeijin's Avatar
Class 2 Laser
 
Join Date: Oct 2007
Location: Pasay, Manila, Philippines
Posts: 320
Rep Power: 11
adgmeijin is on a distinguished road
adgmeijin adgmeijin is offline
Class 2 Laser
adgmeijin's Avatar
 
Join Date: Oct 2007
Location: Pasay, Manila, Philippines
Posts: 320
Rep Power: 11
adgmeijin is on a distinguished road
Default Re: actual CURRENT? after the dead LD and resistor

ok that's great, what suppose to be the best resistor value when i use the open can on its sweet spot of current? is it ok if i combine 10ohm and 4.7 ohm a to have 3.12ohms?
adgmeijin is offline   Reply With Quote
Old 01-29-2008, 04:47 AM #11
Class 3R Laser
 
Join Date: Dec 2007
Posts: 1,918
Rep Power: 117
chido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond repute
chido chido is offline
Class 3R Laser
 
Join Date: Dec 2007
Posts: 1,918
Rep Power: 117
chido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond reputechido has a reputation beyond repute
Default Re: actual CURRENT? after the dead LD and resistor

Gazoo said the sweet spot for open cans is 400mA, and yes if you connect those in parallel, it should work. But just to be sure, check their resistance with your multimeter.
chido is offline   Reply With Quote
Old 01-29-2008, 04:57 AM #12
adgmeijin's Avatar
Class 2 Laser
 
Join Date: Oct 2007
Location: Pasay, Manila, Philippines
Posts: 320
Rep Power: 11
adgmeijin is on a distinguished road
adgmeijin adgmeijin is offline
Class 2 Laser
adgmeijin's Avatar
 
Join Date: Oct 2007
Location: Pasay, Manila, Philippines
Posts: 320
Rep Power: 11
adgmeijin is on a distinguished road
Default Re: actual CURRENT? after the dead LD and resistor

actually i have actual resistance of 3.192 ohms from 10ohm and 4.7ohm, i have fresh 6volts input, can you give me a prediction what suppose to be the output for that going through the LD?
adgmeijin is offline   Reply With Quote
Old 01-29-2008, 05:46 AM #13
adgmeijin's Avatar
Class 2 Laser
 
Join Date: Oct 2007
Location: Pasay, Manila, Philippines
Posts: 320
Rep Power: 11
adgmeijin is on a distinguished road
adgmeijin adgmeijin is offline
Class 2 Laser
adgmeijin's Avatar
 
Join Date: Oct 2007
Location: Pasay, Manila, Philippines
Posts: 320
Rep Power: 11
adgmeijin is on a distinguished road
Default Re: actual CURRENT? after the dead LD and resistor

guys i need some possibility guide, what was supposed to happen to my LD set up? i got on my DDL LD driver 3.192ohm total value of resistors, a adjusted trimpot and 6volts fresh battery for input. :-/
adgmeijin is offline   Reply With Quote
Old 01-29-2008, 06:27 AM #14
phenol's Avatar
Class 2M Laser
 
Join Date: Oct 2007
Posts: 533
Rep Power: 50
phenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond repute
phenol phenol is offline
Class 2M Laser
phenol's Avatar
 
Join Date: Oct 2007
Posts: 533
Rep Power: 50
phenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond repute
Default Re: actual CURRENT? after the dead LD and resistor

Quote:
Originally Posted by adgmeijin
guys i need some possibility guide, what was supposed to happen to my LD set up? i got on my DDL LD driver 3.192ohm total value of resistors, a adjusted trimpot and 6volts fresh battery for input. :-/
with 3.19ohms of min resistance the max current would be ~390mA. Since you have a pot /what resistance?/ in series with the 10- and 4.7-ohm parallelled resistors, you can get any current starting from 1.25/(Rpotmax+3.19) to 1.25/(Rpotmin+3.19). If Rpotmin=0, the max current would be 390mA. just make sure your batt is always fresh or the LM317 will drop out.
phenol is offline   Reply With Quote
Old 01-29-2008, 07:13 AM #15
adgmeijin's Avatar
Class 2 Laser
 
Join Date: Oct 2007
Location: Pasay, Manila, Philippines
Posts: 320
Rep Power: 11
adgmeijin is on a distinguished road
adgmeijin adgmeijin is offline
Class 2 Laser
adgmeijin's Avatar
 
Join Date: Oct 2007
Location: Pasay, Manila, Philippines
Posts: 320
Rep Power: 11
adgmeijin is on a distinguished road
Default Re: actual CURRENT? after the dead LD and resistor

thanks a man this was a big help. ;D
adgmeijin is offline   Reply With Quote
Old 01-29-2008, 07:23 AM #16
phenol's Avatar
Class 2M Laser
 
Join Date: Oct 2007
Posts: 533
Rep Power: 50
phenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond repute
phenol phenol is offline
Class 2M Laser
phenol's Avatar
 
Join Date: Oct 2007
Posts: 533
Rep Power: 50
phenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond reputephenol has a reputation beyond repute
Default Re: actual CURRENT? after the dead LD and resistor

Quote:
Originally Posted by adgmeijin
thanks a man this was a big help. ;D
math 101
phenol 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 09:38 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