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 12-26-2007, 12:36 PM #1
Class 1M Laser
 
Join Date: Nov 2007
Posts: 158
Rep Power: 12
stackingmont has a spectacular aura aboutstackingmont has a spectacular aura aboutstackingmont has a spectacular aura about
stackingmont stackingmont is offline
Class 1M Laser
 
Join Date: Nov 2007
Posts: 158
Rep Power: 12
stackingmont has a spectacular aura aboutstackingmont has a spectacular aura aboutstackingmont has a spectacular aura about
Default testing LM317 driver

i just did some repairs on my diode driver, and i want to test it. my diode is in the mail. sadly, i don't have a multimeter and i trashed my burnt diode in the process of getting it out of the module, so i decided to use a regular flashlight bulb. when i connect it, it does not light up. i was wondering if this is normal and if anyone has any other suggestions to make sure that my driver is at least conducting electricity.


stackingmont is offline   Reply With Quote







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







Old 12-26-2007, 02:37 PM #2
Class 2 Laser
 
Join Date: Nov 2007
Posts: 317
Rep Power: 11
xanatos is on a distinguished road
xanatos xanatos is offline
Class 2 Laser
 
Join Date: Nov 2007
Posts: 317
Rep Power: 11
xanatos is on a distinguished road
Default Re: testing LM317 driver

Yup, simple - using a 1-ohm resistor and 4- 1N4001 diodes, all in series. Complete details have already been covered here:

http://www.laserpointerforums.com/fo...num=1190170289

Measure current by measuring voltage drop across the 1 ohm (mV = mA) and read V to the diode by reading V across the 4 1N4001 diodes. Look at the instructions/diagram and you'll be all set. I've built a few of these units, complete with heat shrink, for testing. Only used one once to test if IT worked, and it does. Happy testing!

Dave

xanatos is offline   Reply With Quote
Old 12-26-2007, 03:23 PM #3
Class 1M Laser
 
Join Date: Nov 2007
Posts: 158
Rep Power: 12
stackingmont has a spectacular aura aboutstackingmont has a spectacular aura aboutstackingmont has a spectacular aura about
stackingmont stackingmont is offline
Class 1M Laser
 
Join Date: Nov 2007
Posts: 158
Rep Power: 12
stackingmont has a spectacular aura aboutstackingmont has a spectacular aura aboutstackingmont has a spectacular aura about
Default Re: testing LM317 driver

but would the current be enough to light up the flashlight bulb?
stackingmont is offline   Reply With Quote
Old 12-26-2007, 03:31 PM #4
Class 2 Laser
 
Join Date: Nov 2007
Posts: 317
Rep Power: 11
xanatos is on a distinguished road
xanatos xanatos is offline
Class 2 Laser
 
Join Date: Nov 2007
Posts: 317
Rep Power: 11
xanatos is on a distinguished road
Default Re: testing LM317 driver

Current delivered to a resistive load is a function of the resistance of the load. The LM317 will deliver what current you set it to for an LD, which will take (for example) 250mA at around 3v. If the resistance of the lightbulb is higher than a given amount, the voltage across it will not be sufficient to push the current necessary to drive it to incandescence. In short, probably not! Measure the voltage across the bulb just for fun, but if you're serious about being sure it's going to work, nothing like making the right tool for the job.

Dave

xanatos is offline   Reply With Quote
Old 12-26-2007, 08:22 PM #5
Class 1M Laser
 
Join Date: Nov 2007
Posts: 158
Rep Power: 12
stackingmont has a spectacular aura aboutstackingmont has a spectacular aura aboutstackingmont has a spectacular aura about
stackingmont stackingmont is offline
Class 1M Laser
 
Join Date: Nov 2007
Posts: 158
Rep Power: 12
stackingmont has a spectacular aura aboutstackingmont has a spectacular aura aboutstackingmont has a spectacular aura about
Default Re: testing LM317 driver

k thanks, i just picked up a green led from radioshack and it does seem to have similar qualities voltage wise as the LD. i also got a project box to put it all in. I can't wait till the LD comes!
stackingmont is offline   Reply With Quote
Old 12-26-2007, 08:41 PM #6
rog8811's Avatar
Class 3B Laser
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
rog8811 rog8811 is offline
Class 3B Laser
rog8811's Avatar
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
Default Re: testing LM317 driver

If you are considering doing more laser building I would seriously suggest that you get yourself a digital multimeter, they are pretty cheap but invaluable for checking your circuits before connecting an expensive LD. It takes all of the finger crossing out of final connection

Regards rog8811
__________________
See all of my videos on Vimeo
http://www.vimeo.com/4454150

Lots of tutorials and information on lasers
http://www.rog8811.com/

In the land of the blind the one eyed man..... is most likely holding the laser
rog8811 is offline   Reply With Quote
Old 12-26-2007, 08:56 PM #7
Class 1M Laser
 
Join Date: Nov 2007
Posts: 158
Rep Power: 12
stackingmont has a spectacular aura aboutstackingmont has a spectacular aura aboutstackingmont has a spectacular aura about
stackingmont stackingmont is offline
Class 1M Laser
 
Join Date: Nov 2007
Posts: 158
Rep Power: 12
stackingmont has a spectacular aura aboutstackingmont has a spectacular aura aboutstackingmont has a spectacular aura about
Default Re: testing LM317 driver

well you're right, but in this case i already know it will work because i've used this same driver to drive a diode before, but the diode burnt out from a discharge of the cap after being briefly disconnected. ill look into a multimeter. do u know if they have them at radioshack?
stackingmont is offline   Reply With Quote
Old 12-26-2007, 09:15 PM #8
Class 2 Laser
 
Join Date: Nov 2007
Posts: 317
Rep Power: 11
xanatos is on a distinguished road
xanatos xanatos is offline
Class 2 Laser
 
Join Date: Nov 2007
Posts: 317
Rep Power: 11
xanatos is on a distinguished road
Default Re: testing LM317 driver

Yes, RatShack has a few meters. I actually have one, works pretty good.

Dave
xanatos is offline   Reply With Quote
Old 12-26-2007, 11:46 PM #9
Class 1M Laser
 
Join Date: Nov 2007
Posts: 158
Rep Power: 12
stackingmont has a spectacular aura aboutstackingmont has a spectacular aura aboutstackingmont has a spectacular aura about
stackingmont stackingmont is offline
Class 1M Laser
 
Join Date: Nov 2007
Posts: 158
Rep Power: 12
stackingmont has a spectacular aura aboutstackingmont has a spectacular aura aboutstackingmont has a spectacular aura about
Default Re: testing LM317 driver

cool ill go look at em. i live like a mile away from a radioshack, so i practically live there.
stackingmont 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 03:09 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