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 09-16-2009, 06:54 PM #1
Junior Member
 
Join Date: Sep 2009
Posts: 4
Rep Power: 0
CRXDelSol is on a distinguished road
CRXDelSol CRXDelSol is offline
Junior Member
 
Join Date: Sep 2009
Posts: 4
Rep Power: 0
CRXDelSol is on a distinguished road
Default Need help with current and resistance

Hello,

Recently I bought this laser kit on Ebay:

300mW+ 650nm Red High Power burn Laser Diode Module Kit - eBay (item 280393602910 end time Sep-11-09 21:27:47 PDT)

It came well shipped, all parts were in the package.
Now I have soldered everything on the circuit-board, and now I am trying to find an adaptor which I can use for testing.

However, I don't want to kill the diode, so I wanted to ask for some advice...
I don't know much about resistors and currents.

On the example page which includes the schematic, it shows an example current of 417mA with 3ohm resistance (adjustable @ pot).

I = 1.25 / R

I = current, R = resistance

I can use 6 to 20 Volts.

My questions:

1. How much difference does it make when I use 6 or 20 Volts?
2. In what kind of way will this have influence on the input mA + ohm's?
3. Can I use a 12V - 350mA adaptor? I guess I then have to set the pot to 3.57 ohm. [ 1.25 / 0.350 = 3.57 ].

Please help me out, I am not realy into currents and Voltages etc.

Just for extra information, the title on the schematic shows:

"Max 463mA Constant Current LD Driver Kit
Input Voltage 6 - 20V"

Thank you.


CRXDelSol is offline   Reply With Quote







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







Old 09-16-2009, 07:07 PM #2
Class 4 Laser
 
Join Date: Nov 2008
Posts: 5,728
Rep Power: 547
ElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond repute
ElektroFreak ElektroFreak is offline
Class 4 Laser
 
Join Date: Nov 2008
Posts: 5,728
Rep Power: 547
ElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond repute
Default Re: Need help with current and resistance

Quote:
Originally Posted by CRXDelSol View Post

On the example page which includes the schematic, it shows an example current of 417mA with 3ohm resistance (adjustable @ pot).

I = 1.25 / R

I = current, R = resistance

I can use 6 to 20 Volts.

My questions:

1. How much difference does it make when I use 6 or 20 Volts?

None as far as output. The regulator in the circuit (little black box with three pins and a metal tab) will convert any excess voltage to heat, so the higher the input voltage, the more heatsinking the regulator will require.

2. In what kind of way will this have influence on the input mA + ohm's?

No influence. As long as you have built the circuit correctly, the output should remain the same at any input voltage between 6 and 20V.

3. Can I use a 12V - 350mA adaptor? I guess I then have to set the pot to 3.57 ohm. [ 1.25 / 0.350 = 3.57 ].

I would find an adaptor that provides more than 350mA, 500mA-1A (1000mA) would be best. The kind of diode in your kit will last longest if you set the driver's output at 325-375mA

Please help me out, I am not realy into currents and Voltages etc.

Just for extra information, the title on the schematic shows:

"Max 463mA Constant Current LD Driver Kit
Input Voltage 6 - 20V"

Thank you.
blah blah max characters blah
__________________
Laser Resources (for n00bs and veterans alike!)

Sam's Laser FAQ (The Laser Bible)

http://www.repairfaq.org/sam/laserfaq.htm

RP Photonics Encyclopedia of Laser Physics and Technology

http://www.rp-photonics.com/encyclopedia.html

ULTIMATE DIY PROJECTOR REFERENCE

http://nqlasers.com/scannerreference...itle=Main_Page

SUCCESS is the best revenge.
ElektroFreak is offline   Reply With Quote
Old 09-16-2009, 07:12 PM #3
Junior Member
 
Join Date: Sep 2009
Posts: 4
Rep Power: 0
CRXDelSol is on a distinguished road
CRXDelSol CRXDelSol is offline
Junior Member
 
Join Date: Sep 2009
Posts: 4
Rep Power: 0
CRXDelSol is on a distinguished road
Default Re: Need help with current and resistance

Thank you very much for your reply.
I do have an adaptor with more mA output, 600 for example.
But I don't know what the output mA will be then.
That depends on the pot right?
So if I put 600 mA directly on the driver, what will be the best value for the pot then?

(Again, sorry for my low level of knowledge about electricity...)
CRXDelSol is offline   Reply With Quote
Old 09-16-2009, 07:14 PM #4
Class 4 Laser
 
Join Date: Nov 2008
Posts: 5,728
Rep Power: 547
ElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond repute
ElektroFreak ElektroFreak is offline
Class 4 Laser
 
Join Date: Nov 2008
Posts: 5,728
Rep Power: 547
ElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond repute
Default Re: Need help with current and resistance

You'll need to build and use a test load to set the driver. You hook the load up to the driver first instead of the laser diode, then you set your current, and then disconnect the test load and connect the laser diode.

For more information on test loads and how they work, search the forum using the terms "test load" and "dummy load".

Also, this thread has TONS of info to help out a new person such as yourself: Meta Topic : Pinout & Performance of actual LD
__________________
Laser Resources (for n00bs and veterans alike!)

Sam's Laser FAQ (The Laser Bible)

http://www.repairfaq.org/sam/laserfaq.htm

RP Photonics Encyclopedia of Laser Physics and Technology

http://www.rp-photonics.com/encyclopedia.html

ULTIMATE DIY PROJECTOR REFERENCE

http://nqlasers.com/scannerreference...itle=Main_Page

SUCCESS is the best revenge.

Last edited by ElektroFreak; 09-16-2009 at 07:17 PM.
ElektroFreak is offline   Reply With Quote
Old 09-16-2009, 08:22 PM #5
Junior Member
 
Join Date: Sep 2009
Posts: 4
Rep Power: 0
CRXDelSol is on a distinguished road
CRXDelSol CRXDelSol is offline
Junior Member
 
Join Date: Sep 2009
Posts: 4
Rep Power: 0
CRXDelSol is on a distinguished road
Default Re: Need help with current and resistance

I have found that I need the following parts for a test/dummy load:

4 1N400X diodes and a 1 Ohm resistor

Then I have to find those 4 diodes first.
I will go look for it.
CRXDelSol is offline   Reply With Quote
Old 09-16-2009, 11:17 PM #6
Class 4 Laser
 
Join Date: Nov 2008
Posts: 5,728
Rep Power: 547
ElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond repute
ElektroFreak ElektroFreak is offline
Class 4 Laser
 
Join Date: Nov 2008
Posts: 5,728
Rep Power: 547
ElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond repute
Default Re: Need help with current and resistance

1N4001 will do fine. You can get them very cheaply from Radio Shack (or any electronics supplier)
__________________
Laser Resources (for n00bs and veterans alike!)

Sam's Laser FAQ (The Laser Bible)

http://www.repairfaq.org/sam/laserfaq.htm

RP Photonics Encyclopedia of Laser Physics and Technology

http://www.rp-photonics.com/encyclopedia.html

ULTIMATE DIY PROJECTOR REFERENCE

http://nqlasers.com/scannerreference...itle=Main_Page

SUCCESS is the best revenge.
ElektroFreak is offline   Reply With Quote
Old 09-17-2009, 12:50 AM #7
lasersbee's Avatar
Class 4 Laser
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,683
Rep Power: 38219
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
lasersbee lasersbee is offline
Class 4 Laser
lasersbee's Avatar
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,683
Rep Power: 38219
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
Default Re: Need help with current and resistance

Don't forget....
you can get 10pc FREE 1 Ohm 1/2 Watt resistors here on the Forum...

http://laserpointerforums.com/f39/fr...ors-42409.html


Jerry
__________________

J.BAUER Electronics Home Page

LaserBee Laser Power Meter Products meet your needs
at affordable Prices:
See them all here on LPF

LaserBee Power Meter products ALWAYS in Stock
and ready to ship

Also available on eBay:Check availability here..

Subsidary: Pharma Electronic Solutions


This banner is available to and can be copied/used FREE by any LaserBee owner
lasersbee 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 03:55 AM.


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