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 02-21-2014, 02:17 PM #1
Junior Member
 
Join Date: Feb 2014
Location: Hollywood, FL
Posts: 10
Rep Power: 0
DangGucci is on a distinguished road
DangGucci DangGucci is offline
Junior Member
 
Join Date: Feb 2014
Location: Hollywood, FL
Posts: 10
Rep Power: 0
DangGucci is on a distinguished road
Question Dummy Load & Batteries for M140?

Good morning everyone I will be assembling my laser today since everything comes in the mail, but I wanted to know if my homemade dummy load would function properly:

I'm using a BlitzBuckv4 driver, and a 2W 445nm M140 LD (Vf = 4.0~4.5). This being the case, I would like to set my driver to 1.8 amps (what I have seen as a relatively safe operating current for this specific diode). I already get the gist of how to go about measuring, I just want to know if I used the correct diodes and correct amount

This is the dummy: Driver Board (+) -> 1ohm 10W resistor -> 1N5404 -> 1N5404 -> 1N5404 -> 1N5404 -> Driver Board (-)

I figure using 1N5404 x4 since they drop about .85V (correct me if I'm wrong) at around 1.8 A. .85 * 4 = 3.4V. Then add the Vf of the resistor which, also after some research, seems to be 1V, so I have a total of 4.4V drop, which is within the range of the 445nm's calculated Vf. I know to measure with a DMM around the resistor.

So...will this lil rig work? Or do I need to add one more 1N5404? Also, I can't seem to find out if it matters whether I test this out with one battery or two, and what I can do for a temporary replacement of two x 18650 (S4 host with battery extension) without damaging anything or reducing power output? I've found nothing through research, and I just want to confirm the "yes" or "no." One more thing, I live in South Florida.. can I buy these batteries locally somewhere? Or is that highly inconceivable due to their nature and relatively low demand? I appreciate the patience, considering I want to make this lil' beast perfectly


DangGucci is offline   Reply With Quote







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







Old 02-21-2014, 02:51 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: Dummy Load & Batteries for M140?

Their voltage drop will be rated at a specific current and if it is .85V @ 1A then going to 1.8A will increse the drop quite a bit. For 445nm I find the red setting in this design with 4X1N4001 diodes to drop around 4.5V+ which is perfect.
DTR is online now   Reply With Quote
Old 02-21-2014, 03:32 PM #3
Junior Member
 
Join Date: Feb 2014
Location: Hollywood, FL
Posts: 10
Rep Power: 0
DangGucci is on a distinguished road
DangGucci DangGucci is offline
Junior Member
 
Join Date: Feb 2014
Location: Hollywood, FL
Posts: 10
Rep Power: 0
DangGucci is on a distinguished road
Default Re: Dummy Load & Batteries for M140?

Wow that's perfect, thank you so much DTR, Ill be making a stop at my local RadioShack

I already constructed the 1N5404 dummy load I previously mentioned, and since the VF of one is 1.2 @ 3Amps, I figure .85Vf for the 1.8 Amps is relatively accurate, and I feel like I read this somewhere else (confirming my suspicion). But I don't think I want to risk it; I'll go with what works best, which you have officially confirmed for me.

Is there any way to make these tests and run my laser temporarily with batteries I can purchase locally? Or should I go ahead and extract some Lithiums from one of my laptop battery packs? :P
DangGucci 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 02:16 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