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 08-22-2011, 09:39 PM #1
Member
 
Join Date: Aug 2011
Location: Honolulu, HI
Posts: 37
Rep Power: 0
furrylaser is on a distinguished road
furrylaser furrylaser is offline
Member
 
Join Date: Aug 2011
Location: Honolulu, HI
Posts: 37
Rep Power: 0
furrylaser is on a distinguished road
Post DIY driver help

so i read the thread about diy drivers, and i have a few questions.

Lets say i want to power a 445nm diode up to 1000ma. would i need to put one 1 ohm resistor or ten 10 ohm resistors?


Edit: Also would it be better to just buy a driver to power the diode?



Last edited by furrylaser; 08-22-2011 at 09:39 PM.
furrylaser is offline   Reply With Quote







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







Old 08-22-2011, 09:42 PM #2
Jacob32123's Avatar
Class 2M Laser
 
Join Date: Nov 2009
Location: USA
Posts: 766
Rep Power: 178
Jacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond repute
Jacob32123 Jacob32123 is offline
Class 2M Laser
Jacob32123's Avatar
 
Join Date: Nov 2009
Location: USA
Posts: 766
Rep Power: 178
Jacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond reputeJacob32123 has a reputation beyond repute
Default Re: DIY driver help

r = v/i

lets sat you feed it 4.5 volts and you want to drive it at 1 amp

r = 4.5/1

You need a 4.5 ohm resistor to drive a diode at 1 amp assuming your voltage is 4.5 volts.

EDIT:
If you have 2x 10 ohm resistors on hand, put them in parallel (or 5x 1 ohms in series) and that will give you a 5 ohm resistor

Last edited by Jacob32123; 08-22-2011 at 09:47 PM.
Jacob32123 is offline   Reply With Quote
Old 08-22-2011, 10:27 PM #3
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,142
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,142
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: DIY driver help

What driver are you thinking of using, mister furrylaser?

Quote:
Originally Posted by Jacob32123 View Post
r = 4.5/1
V should be the voltage drop across the resistor, not the supply voltage.

What about if the supply voltage was 2V and we used that equation? It would suggest 2 ohms when in fact NO value of resistor will will allow any current through the diode, because 2V isn't enough.

The forward voltage of a 445nm at 1A is about 4.5V. So if your supply voltage was 4.5V, you wouldn't need a resistor.

That's theory, but in the real world, you cannot be sure that either the voltage of the diode or the voltage of the power supply will be exactly 4.5 all the time, and small changes in voltage make for large changes in current.
__________________
A problem well stated is a problem half solved.

Last edited by Cyparagon; 08-22-2011 at 10:32 PM. Reason: added info
Cyparagon is online now   Reply With Quote
Old 08-22-2011, 10:40 PM #4
Member
 
Join Date: Aug 2011
Location: Honolulu, HI
Posts: 37
Rep Power: 0
furrylaser is on a distinguished road
furrylaser furrylaser is offline
Member
 
Join Date: Aug 2011
Location: Honolulu, HI
Posts: 37
Rep Power: 0
furrylaser is on a distinguished road
Default Re: DIY driver help

I was thinking about making my own driver, using a LM317 regulator. Also which kind of variable resistor would i need on it? This is my first "high" powered laser.
furrylaser is offline   Reply With Quote
Old 08-22-2011, 11:02 PM #5
Member
 
Join Date: Aug 2011
Location: Honolulu, HI
Posts: 37
Rep Power: 0
furrylaser is on a distinguished road
furrylaser furrylaser is offline
Member
 
Join Date: Aug 2011
Location: Honolulu, HI
Posts: 37
Rep Power: 0
furrylaser is on a distinguished road
Default Re: DIY driver help

i also have another question, how do you short out a capacitor?
furrylaser is offline   Reply With Quote
Old 08-22-2011, 11:12 PM #6
bennett326's Avatar
Class 3R Laser
 
Join Date: May 2011
Location: tennessee
Posts: 1,965
Rep Power: 131
bennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond repute
bennett326 bennett326 is offline
Class 3R Laser
bennett326's Avatar
 
Join Date: May 2011
Location: tennessee
Posts: 1,965
Rep Power: 131
bennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond repute
Default Re: DIY driver help

Quote:
Originally Posted by furrylaser View Post
i also have another question, how do you short out a capacitor?
short out the negative and positive leads aka rub the wires together
__________________
Etherdream DAC review here

benneh: it might have been a dye laser pumped by a argon
benneh: HOLY SH!T
benneh: i am such a nerd
ARG: AHHAHAHHAHHAHAAHA
bennett326 is offline   Reply With Quote
Old 08-23-2011, 12:59 AM #7
Member
 
Join Date: Aug 2011
Location: Honolulu, HI
Posts: 37
Rep Power: 0
furrylaser is on a distinguished road
furrylaser furrylaser is offline
Member
 
Join Date: Aug 2011
Location: Honolulu, HI
Posts: 37
Rep Power: 0
furrylaser is on a distinguished road
Default Re: DIY driver help

the wires going to the diode or to the battery?

also do you have to do this everytime after you set the current with a test load?
furrylaser is offline   Reply With Quote
Old 08-23-2011, 01:15 AM #8
bennett326's Avatar
Class 3R Laser
 
Join Date: May 2011
Location: tennessee
Posts: 1,965
Rep Power: 131
bennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond repute
bennett326 bennett326 is offline
Class 3R Laser
bennett326's Avatar
 
Join Date: May 2011
Location: tennessee
Posts: 1,965
Rep Power: 131
bennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond repute
Default Re: DIY driver help

to the diode and im a little confused by your 2nd question
__________________
Etherdream DAC review here

benneh: it might have been a dye laser pumped by a argon
benneh: HOLY SH!T
benneh: i am such a nerd
ARG: AHHAHAHHAHHAHAAHA
bennett326 is offline   Reply With Quote
Old 08-23-2011, 05:52 AM #9
Member
 
Join Date: Aug 2011
Location: Honolulu, HI
Posts: 37
Rep Power: 0
furrylaser is on a distinguished road
furrylaser furrylaser is offline
Member
 
Join Date: Aug 2011
Location: Honolulu, HI
Posts: 37
Rep Power: 0
furrylaser is on a distinguished road
Default Re: DIY driver help

oh what i mean is when or how often do u have to short the capacitor
furrylaser is offline   Reply With Quote
Old 08-23-2011, 08:39 AM #10
Limecat's Avatar
Class 1M Laser
 
Join Date: Dec 2009
Posts: 141
Rep Power: 15
Limecat is a splendid one to beholdLimecat is a splendid one to beholdLimecat is a splendid one to beholdLimecat is a splendid one to beholdLimecat is a splendid one to beholdLimecat is a splendid one to beholdLimecat is a splendid one to behold
Limecat Limecat is offline
Class 1M Laser
Limecat's Avatar
 
Join Date: Dec 2009
Posts: 141
Rep Power: 15
Limecat is a splendid one to beholdLimecat is a splendid one to beholdLimecat is a splendid one to beholdLimecat is a splendid one to beholdLimecat is a splendid one to beholdLimecat is a splendid one to beholdLimecat is a splendid one to behold
Default Re: DIY driver help

I rather not call you "furry," unless you are lol.
Anyway, I'm doing the same thing too. I just bought the beefiest potentiometer I could find. I think mine is a 5W wire wound pot lol. Not taking chances with the potentiometer frying and putting my power control out of commision. Anyway I've used it on my breadboard with no probs. try that.
Limecat is offline   Reply With Quote
Old 08-23-2011, 11:44 AM #11
bennett326's Avatar
Class 3R Laser
 
Join Date: May 2011
Location: tennessee
Posts: 1,965
Rep Power: 131
bennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond repute
bennett326 bennett326 is offline
Class 3R Laser
bennett326's Avatar
 
Join Date: May 2011
Location: tennessee
Posts: 1,965
Rep Power: 131
bennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond repute
Default Re: DIY driver help

Quote:
Originally Posted by furrylaser View Post
oh what i mean is when or how often do u have to short the capacitor
Before you hook up your diode
__________________
Etherdream DAC review here

benneh: it might have been a dye laser pumped by a argon
benneh: HOLY SH!T
benneh: i am such a nerd
ARG: AHHAHAHHAHHAHAAHA
bennett326 is offline   Reply With Quote
Old 08-23-2011, 04:12 PM #12
Member
 
Join Date: Aug 2011
Location: Honolulu, HI
Posts: 37
Rep Power: 0
furrylaser is on a distinguished road
furrylaser furrylaser is offline
Member
 
Join Date: Aug 2011
Location: Honolulu, HI
Posts: 37
Rep Power: 0
furrylaser is on a distinguished road
Default Re: DIY driver help

ok so i got a 1w 445 diode from 5.6mm 445nm ~1W laser diode [M0020] - $51.99 : Modwerx Shop and i pressed it into an aixiz module and am using a glass 445nm lens. Now for the driver, i was thinking about making one with the lm317 regulator. I just have a couple questions, how much voltage does the diode need? I am going to use a 9 volt power supply and how many resistors do i need rated at how many ohms?I used the r=v/i and so r=9/1.2 (i decided to power it at 1.2 amps) and got 7.5. So do i need a 7.5 ohm resistor? Also do i need a capacitor? Lastly i don't really get what a potentiometer does i think it regulates the current but then how do you know how high of a potentiometer you need?

thank you

Last edited by furrylaser; 08-23-2011 at 04:15 PM.
furrylaser is offline   Reply With Quote
Old 08-23-2011, 08:10 PM #13
bennett326's Avatar
Class 3R Laser
 
Join Date: May 2011
Location: tennessee
Posts: 1,965
Rep Power: 131
bennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond repute
bennett326 bennett326 is offline
Class 3R Laser
bennett326's Avatar
 
Join Date: May 2011
Location: tennessee
Posts: 1,965
Rep Power: 131
bennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond reputebennett326 has a reputation beyond repute
Default Re: DIY driver help

Quote:
Originally Posted by furrylaser View Post
ok so i got a 1w 445 diode from 5.6mm 445nm ~1W laser diode [M0020] - $51.99 : Modwerx Shop and i pressed it into an aixiz module and am using a glass 445nm lens. Now for the driver, i was thinking about making one with the lm317 regulator. I just have a couple questions, how much voltage does the diode need? I am going to use a 9 volt power supply and how many resistors do i need rated at how many ohms?I used the r=v/i and so r=9/1.2 (i decided to power it at 1.2 amps) and got 7.5. So do i need a 7.5 ohm resistor? Also do i need a capacitor? Lastly i don't really get what a potentiometer does i think it regulates the current but then how do you know how high of a potentiometer you need?

thank you
A potometer is a variable resistor
I'm on my way home from school and ill give you a link that will help a lot
__________________
Etherdream DAC review here

benneh: it might have been a dye laser pumped by a argon
benneh: HOLY SH!T
benneh: i am such a nerd
ARG: AHHAHAHHAHHAHAAHA
bennett326 is offline   Reply With Quote
Reply

Tags
driver, lm317, resistor





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 05:39 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