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 > Drivers, Test-load, Power Supply, & Batteries



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



Reply
 
LinkBack Thread Tools Display Modes
Old 03-30-2012, 08:46 PM #1
Junior Member
 
Join Date: Jun 2011
Posts: 20
Rep Power: 0
robvdv is a glorious beacon of lightrobvdv is a glorious beacon of lightrobvdv is a glorious beacon of lightrobvdv is a glorious beacon of lightrobvdv is a glorious beacon of light
robvdv robvdv is offline
Junior Member
 
Join Date: Jun 2011
Posts: 20
Rep Power: 0
robvdv is a glorious beacon of lightrobvdv is a glorious beacon of lightrobvdv is a glorious beacon of lightrobvdv is a glorious beacon of lightrobvdv is a glorious beacon of light
Default Powering LM350 and 445nm off a 13.8v UPS

I want to drive a number of LM350 and 445nm diodes off a UPS. The UPS will be powered by a two stroke generator. The LM350s are heatsinked and driven at around 1.2A. They'll be on continuously for 12 hours or so per day.

I hope that the UPS battery will smooth out voltage spikes caused by the cheapie generator and recharging inverter, but I don't know if that's the case. Does anyone here have any experience with this?

Also, is 13.8v too high to drive this circuit? I have the impression from my reading that "diodes set their own voltage and the linear driver will burn off the excess". Is that more or less correct, in layman's terms?

A side note: I have two inverters, one in my car and this UPS. Both seem to put out a lot of stray voltage/earth leakage. Is this normal/expected?


robvdv is offline   Reply With Quote







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







Old 03-30-2012, 09:16 PM #2
DTR's Avatar
DTR DTR is online now
Class 4 Laser
 
Join Date: Jun 2010
Location: St. Louis MO
Posts: 5,482
Rep Power: 10819
DTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond repute
DTR DTR is online now
Class 4 Laser
DTR's Avatar
 
Join Date: Jun 2010
Location: St. Louis MO
Posts: 5,482
Rep Power: 10819
DTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond reputeDTR has a reputation beyond repute
Default Re: Powering LM350 and 445nm off a 13.8v UPS

If you are planning on running 2 you might want to put them in series to reduce the voltage that is being dropped. Or if it is 4 or 8 try to work out a mix of series and parallel that will work with the available voltage/current the power supply can supply. Even if the LM350 could handle 14V that is a lot of voltage being dropped as heat if you just did a single or several in parallel.
DTR is online now   Reply With Quote
Old 03-31-2012, 06:07 PM #3
Junior Member
 
Join Date: Jun 2011
Posts: 20
Rep Power: 0
robvdv is a glorious beacon of lightrobvdv is a glorious beacon of lightrobvdv is a glorious beacon of lightrobvdv is a glorious beacon of lightrobvdv is a glorious beacon of light
robvdv robvdv is offline
Junior Member
 
Join Date: Jun 2011
Posts: 20
Rep Power: 0
robvdv is a glorious beacon of lightrobvdv is a glorious beacon of lightrobvdv is a glorious beacon of lightrobvdv is a glorious beacon of lightrobvdv is a glorious beacon of light
Default Re: Powering LM350 and 445nm off a 13.8v UPS

Thanks, DTR. I tried running it for around 15 minutes. The heatsink on the LM350 became hot enough to start melting the duct tape it was resting on.

Maybe I should just put on some really huge heatsinks and be done with it. This guy seems to drop 25W of heat this way: Special heat sink for an Lm350 voltage regulator.
robvdv 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 06:48 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