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.

One laser store meets all your needs

 Laser Pointer Forums - Discuss Laser Pointers How to make a selectable Dummy Load - VERY in depth

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

02-07-2012, 05:57 AM #17
 Class 3B Laser Join Date: May 2009 Location: Sydney, Australia Posts: 3,256 Rep Power: 360
bobhaha
Class 3B Laser

Join Date: May 2009
Location: Sydney, Australia
Posts: 3,256
Rep Power: 360
Re: How to make a selectable Dummy Load - VERY in depth

@edy

The resistor is a 1 ohm load. With a 1 ohm load, we can directly convert voltage to current.

Using Ohms law...

V= IR
Since we know the resistance is 1ohm, we can re write the equation like this...
V=Ix1
Or
V=I
Where V is voltage and I is current.

So when measuring a voltage across the resistor, you are effectively measuring the current in the system.

__________________
Lasers!
10.6um - >40W CO2 Laser - 25W RF excited CO2 Laser*
685nm - Being built!
660nm - 250mW LOC PowerLight B50 Host - 100mW WL pulsar
635nm - 430mW C6 Host*
632.8nm - Red He-Ne laser ~1mW
593.5nm - Regal 5
542.8nm - Green He-Ne laser ~2.5mW
532nm - 620mW+ lasersman Firedragon III* - 100mW PGL-III-M from JETLASERS* - 70mW Rayfoss Host*
~~~ - 175mW Rayfoss Host - <5mW WL Core - 55mW DinoDirect review laser*

488nm - On the hoist
473nm - 2x CNI lab lasers ~40mW
445nm - 3W Big Boyz Laser - >1.1W Cree C6 Host - 650mW WL Arctic
405nm - 65mW GLP-405 Aquarius host - 160mW 6x Blu-ray MXDL Host
Total: 71,868.5 mW

Goggles!
Laser glow LSG-532-Sport protective eye goggles OD 7+ 190-532nm HIGHLY RECOMMENDED!!
Jetlasers wrap around 190-540nm OD4+ goggles*
Eagle Pair Red OD4+ goggles
Scopeguy20 Blublockers for 405nm lasers!

* indicates a review has been done, on this item.

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

10-02-2012, 01:42 AM #18
 Class 1 Laser Join Date: Jun 2012 Location: Spain Posts: 83 Rep Power: 9
laserdelic
Class 1 Laser

Join Date: Jun 2012
Location: Spain
Posts: 83
Rep Power: 9
Re: How to make a selectable Dummy Load - VERY in depth

Bravo post Bob!. Is just what I need. Im building one today
__________________
1 x 450nm 1300mW (killed it in 1 week!)
1 x 635nm 330mW
2 x 532nm 100mW
1 x 405nm 500-600mW

Tons of <=100mw R,G,V pens and modules
5 Laser proyectors 300mw
50mw 3 axis homebrew spirograph

Generative laser videolandscapes: laserdelic.com

10-08-2012, 10:34 PM #19
 Class 1 Laser Join Date: Jun 2012 Location: Spain Posts: 83 Rep Power: 9
laserdelic
Class 1 Laser

Join Date: Jun 2012
Location: Spain
Posts: 83
Rep Power: 9
Re: How to make a selectable Dummy Load - VERY in depth

Using 1 Ohm/1w resistor and 1N4007 diodes.

I havenŽt used it yet because Im using a analogic multimeter. My digital is half died. Im buying a new one this days to try it.
Attached Thumbnails

__________________
1 x 450nm 1300mW (killed it in 1 week!)
1 x 635nm 330mW
2 x 532nm 100mW
1 x 405nm 500-600mW

Tons of <=100mw R,G,V pens and modules
5 Laser proyectors 300mw
50mw 3 axis homebrew spirograph

Generative laser videolandscapes: laserdelic.com

10-09-2012, 02:20 AM #20
 Class 3B Laser Join Date: May 2009 Location: Sydney, Australia Posts: 3,256 Rep Power: 360
bobhaha
Class 3B Laser

Join Date: May 2009
Location: Sydney, Australia
Posts: 3,256
Rep Power: 360
Re: How to make a selectable Dummy Load - VERY in depth

Nice job! Looks good.

I'm going to be making a new video/thread on how to build a 3A selectable dummyload for cheap! Should be up very soon.
__________________
Lasers!
10.6um - >40W CO2 Laser - 25W RF excited CO2 Laser*
685nm - Being built!
660nm - 250mW LOC PowerLight B50 Host - 100mW WL pulsar
635nm - 430mW C6 Host*
632.8nm - Red He-Ne laser ~1mW
593.5nm - Regal 5
542.8nm - Green He-Ne laser ~2.5mW
532nm - 620mW+ lasersman Firedragon III* - 100mW PGL-III-M from JETLASERS* - 70mW Rayfoss Host*
~~~ - 175mW Rayfoss Host - <5mW WL Core - 55mW DinoDirect review laser*

488nm - On the hoist
473nm - 2x CNI lab lasers ~40mW
445nm - 3W Big Boyz Laser - >1.1W Cree C6 Host - 650mW WL Arctic
405nm - 65mW GLP-405 Aquarius host - 160mW 6x Blu-ray MXDL Host
Total: 71,868.5 mW

Goggles!
Laser glow LSG-532-Sport protective eye goggles OD 7+ 190-532nm HIGHLY RECOMMENDED!!
Jetlasers wrap around 190-540nm OD4+ goggles*
Eagle Pair Red OD4+ goggles
Scopeguy20 Blublockers for 405nm lasers!

* indicates a review has been done, on this item.

10-09-2012, 10:28 AM #21
 Class 1 Laser Join Date: Jun 2012 Location: Spain Posts: 83 Rep Power: 9
laserdelic
Class 1 Laser

Join Date: Jun 2012
Location: Spain
Posts: 83
Rep Power: 9
Re: How to make a selectable Dummy Load - VERY in depth

IŽll follow that 3A, for sure.

Finally I added two cocodrile tweezers to conect the driver and I cut the unused board with the dremel.

Thank you for sharing. Bob.
__________________
1 x 450nm 1300mW (killed it in 1 week!)
1 x 635nm 330mW
2 x 532nm 100mW
1 x 405nm 500-600mW

Tons of <=100mw R,G,V pens and modules
5 Laser proyectors 300mw
50mw 3 axis homebrew spirograph

Generative laser videolandscapes: laserdelic.com

10-09-2012, 02:34 PM #22
 Class 4 Laser Join Date: Sep 2007 Location: Wisconsin Posts: 9,144 Rep Power: 9321
Cyparagon
Class 4 Laser

Join Date: Sep 2007
Location: Wisconsin
Posts: 9,144
Rep Power: 9321
Re: How to make a selectable Dummy Load - VERY in depth

Quote:
 Originally Posted by laserdelic cocodrile tweezers

I laughed harder than I should have. How the hell did that r move over 4 spaces? I'm totally calling them cocodriles from now on.
__________________
A problem well stated is a problem half solved.

Last edited by Cyparagon; 10-09-2012 at 02:35 PM.

10-09-2012, 08:25 PM #23
 Class 1 Laser Join Date: Jun 2012 Location: Spain Posts: 83 Rep Power: 9
laserdelic
Class 1 Laser

Join Date: Jun 2012
Location: Spain
Posts: 83
Rep Power: 9
Re: How to make a selectable Dummy Load - VERY in depth

In Spanish: Alligator, Crocodile>Cocodrilo )
__________________
1 x 450nm 1300mW (killed it in 1 week!)
1 x 635nm 330mW
2 x 532nm 100mW
1 x 405nm 500-600mW

Tons of <=100mw R,G,V pens and modules
5 Laser proyectors 300mw
50mw 3 axis homebrew spirograph

Generative laser videolandscapes: laserdelic.com

07-31-2013, 08:50 PM #24
 Member Join Date: Jul 2013 Location: Pennsylvania Posts: 34 Rep Power: 0
kuhny1
Member

Join Date: Jul 2013
Location: Pennsylvania
Posts: 34
Rep Power: 0
Re: How to make a selectable Dummy Load - VERY in depth

how many diodes are used for a 650nm red laser LD
__________________
CURRENT COLLECTION

405nm, 900mW (bare module built into an engraver)
445nm, 1 Watt (\Custom/ S6 Laser Host)
532nm, 5mW
520nm 1Watt (\Custom/ S4 Host)

650nm, 250mW (\Custom/ 3D Printed Host)

DEAD LASERS (Then scrapped for parts )

405nm, 150mW (LEDed)
650nm, 250mW (\Custom/ LEDed)

12-30-2013, 07:19 AM #25
 Junior Member Join Date: Dec 2013 Posts: 14 Rep Power: 0
izzzzzz6
Junior Member

Join Date: Dec 2013
Posts: 14
Rep Power: 0
Re: How to make a selectable Dummy Load - VERY in depth

Hi, is anyone able to point me to a thread which explains how many diodes i need to connect in series to check the current for a
Nichia NDB7875 445nm LD? and also i have 1N4001 50V 1A DO-41 Axial Lead Rectifier Diodes and a 1ohm 5W resistor. Can i use these diodes with the correct results? Thanks.
James

12-30-2013, 07:35 AM #26
 Class 3R Laser Join Date: Aug 2012 Location: PH Posts: 1,125 Rep Power: 114
Zeebit
Class 3R Laser

Join Date: Aug 2012
Location: PH
Posts: 1,125
Rep Power: 114
Re: How to make a selectable Dummy Load - VERY in depth

Test Load Diagram's for all laser diodes!

You should use 1N54xx diodes instead. These can handle up to 3A.

Next time, use the search bar at the bottom of the page. Chances are, your questions have already been asked and answered. And don't post the same question twice even if its on another thread.

Last edited by Zeebit; 12-30-2013 at 07:37 AM.

12-31-2013, 12:53 AM #27
 Class 3B Laser Join Date: Jul 2012 Location: IN, United States Posts: 2,864 Rep Power: 1313
crazyspaz
Class 3B Laser

Join Date: Jul 2012
Location: IN, United States
Posts: 2,864
Rep Power: 1313
Re: How to make a selectable Dummy Load - VERY in depth

Use the search bar at the bottom of the page...."Nichia 445 test load" would be a great search term...

01-13-2014, 03:52 PM #28
 Class 2M Laser Join Date: Oct 2011 Location: SW OK USA Posts: 899 Rep Power: 135
Jmillerdoc
Class 2M Laser

Join Date: Oct 2011
Location: SW OK USA
Posts: 899
Rep Power: 135
Re: How to make a selectable Dummy Load - VERY in depth

I can't find the original thread where I mentioned this but this seems to be a good one. If you are looking to source very tight tolerance resistors for your pass resistor to measure the current across, Percy Audio carries some excellent choices for this. As you know the calculation for your current is directly related to the value of the resistor your using. Often times your standard RatShack resistors are more than 10% off labeled value. Having an exact 1 ohm is important if your current measurement is to be accurate. When your pushing some diodes at max and high current a 10% variance could be lethal. Percy carries both Vishay Nude foils (0.25%) and Mills (1%). I haven't asked in a while but IIRC Michael Percy, the owner, probably can even measure the resistor for you. Measuring 1 ohm accurately is generally beyond the ability of most of your standard (even high cost) Ohm meters and for this you really need a MilliOhm meter (expensive). So, of you really want a good tight tolerance resistor try here:

http://www.percyaudio.com/Catalog.pdf

Cheers!

06-24-2014, 04:37 PM #29
 Member Join Date: Jul 2013 Location: Pennsylvania Posts: 34 Rep Power: 0
kuhny1
Member

Join Date: Jul 2013
Location: Pennsylvania
Posts: 34
Rep Power: 0
Re: How to make a selectable Dummy Load - VERY in depth

Sooo I ended up useing a epoxy coated inductor that measured out at 1 ohm would that be alright reading wise

ps: this is just for making a 50-100mW laser so i dont need a beefy resistor.
__________________
CURRENT COLLECTION

405nm, 900mW (bare module built into an engraver)
445nm, 1 Watt (\Custom/ S6 Laser Host)
532nm, 5mW
520nm 1Watt (\Custom/ S4 Host)

650nm, 250mW (\Custom/ 3D Printed Host)

DEAD LASERS (Then scrapped for parts )

405nm, 150mW (LEDed)
650nm, 250mW (\Custom/ LEDed)

06-27-2014, 06:58 AM #30
 Class 4 Laser Join Date: Oct 2007 Location: Oregon, USA Posts: 5,478 Rep Power: 3157
Class 4 Laser

Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 3157
Re: How to make a selectable Dummy Load - VERY in depth

The inductance may affect your driver.
__________________
You must spread some Reputation around before giving it to <person> again.

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 LinkBacks (?) LinkBack to this Thread: http://laserpointerforums.com/f51/how-make-selectable-dummy-load-very-depth-64585.html Posted By For Type Date How to make a selectable Dummy Load - VERY in depth - Laser Pointers This thread Refback 07-05-2013 09:38 AM dummy load for blue ray laser This thread Refback 06-07-2012 06:14 PM Nice automotive voltage range 3000mA Regulator at Deal Extreme - Page 2 This thread Refback 10-22-2011 10:48 PM ????????? This thread Refback 06-22-2011 12:18 AM

All times are GMT. The time now is 07:49 PM.

 -- DarkShadows V5 -- Responsive LPF -2562016 -- Default Style Contact Us - Laser Pointer Forums - Archive - Top