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 11-24-2009, 01:39 AM #1
Kaokin's Avatar
Member
 
Join Date: Oct 2009
Posts: 31
Rep Power: 0
Kaokin is infamous around these parts
Kaokin Kaokin is offline
Member
Kaokin's Avatar
 
Join Date: Oct 2009
Posts: 31
Rep Power: 0
Kaokin is infamous around these parts
Default 1N4001 Diode Question --- Building a Test Load

So i went to radio shack today to purcahse all the components needed in order to construct the test load that is seen on this webpage:

It can be done - Laser driver

I found all the components easily but when i got home to build the test load and read the page again, i encountered a question in the math for this test load! The site says that each 1N4001 diode is supposed to equal a voltage drop of .7 Volts, but upon reading the back of the diode package it states that the "Foward Voltage Drop (VF) at (lf) = 1.6V"

Am i reading this incorrectly and missing something or is this correct and i need to rework the calcualtion for the test load?


I also couldnt find a 1 ohm 1 watt resistor so i bought a 1 ohm 10 watt resistor; this doesnt make a difference right???


Kaokin is offline   Reply With Quote







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







Old 11-24-2009, 01:43 AM #2
Flaminpyro's Avatar
Class 4 Laser
 
Join Date: May 2009
Location: West central Oregon
Posts: 5,461
Rep Power: 1768
Flaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond repute
Flaminpyro Flaminpyro is offline
Class 4 Laser
Flaminpyro's Avatar
 
Join Date: May 2009
Location: West central Oregon
Posts: 5,461
Rep Power: 1768
Flaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond repute
Default Re: 1N4001 Diode Question --- Building a Test Load

The resitor is fine it's better than fine, the diodes are a different story you must have gotten some special diode like a shottkey or something, are they 1n4001 type's. in order for the ckt you have to work it requires diodes with a forward voltage drop of 0.7 volts.
__________________
White Fusion Time Machine 445
473nm LRS-0473-KFM-00150-10 158.5mW Lab style
laser used in the making of the latest TRON movie

CNI PGL-III-C-589 125mW
520 in a SH-032
Viasho 532nm 500mW
CNI pen 532nm 84mW
The Violet Pip Squeek 45mW

_____________________________________
LOOKING FOR A HOST WITH PERFECT HEAT SINKING
order your C-88 Cu kit today !


Last edited by Flaminpyro; 11-24-2009 at 01:46 AM.
Flaminpyro is offline   Reply With Quote
Old 11-24-2009, 02:22 AM #3
Kaokin's Avatar
Member
 
Join Date: Oct 2009
Posts: 31
Rep Power: 0
Kaokin is infamous around these parts
Kaokin Kaokin is offline
Member
Kaokin's Avatar
 
Join Date: Oct 2009
Posts: 31
Rep Power: 0
Kaokin is infamous around these parts
Default Re: 1N4001 Diode Question --- Building a Test Load

thanks pyro, i was afraid you were going to say that What if i were to use them any way and just use fewer?? for example; the ckt recommends 6 x 0.7v diodes for a total of 4.2v of resistance. If i were to use 3 1.6v diodes in series that would give me 4.8v resistance which should be fine for a blu ray diode correct??
Kaokin is offline   Reply With Quote
Old 11-24-2009, 03:00 AM #4
Hemlock_Mike's Avatar
Class 4 Laser
 
Join Date: Jan 2007
Location: North Iowa
Posts: 6,184
Rep Power: 3654
Hemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond repute
Hemlock_Mike Hemlock_Mike is online now
Class 4 Laser
Hemlock_Mike's Avatar
 
Join Date: Jan 2007
Location: North Iowa
Posts: 6,184
Rep Power: 3654
Hemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond reputeHemlock_Mike has a reputation beyond repute
Default Re: 1N4001 Diode Question --- Building a Test Load

That forward drop can be misleading. It depends on the current applied. not always linear.
Test them for voltage drop at ~ 350 mA. a 1N400x diode is usually predictable.

HMike
__________________
It's a dog's life
Hemlock_Mike is online now   Reply With Quote
Old 11-24-2009, 05:35 AM #5
Meatball's Avatar
Class 3B Laser
 
Join Date: Feb 2008
Location: Lincoln, NE
Posts: 2,989
Rep Power: 242
Meatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond repute
Meatball Meatball is offline
Class 3B Laser
Meatball's Avatar
 
Join Date: Feb 2008
Location: Lincoln, NE
Posts: 2,989
Rep Power: 242
Meatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond repute
Default Re: 1N4001 Diode Question --- Building a Test Load

I was running through a huge pile of diodes tonight, just sorting them out. All of my 1N4001s seems to have a .9 volt drop across them. They are usually fine for me. I wonder what is so different about your diodes then...
__________________
FIAT LUX

(\__/)
(='.'=)
(")_(")
Meatball is offline   Reply With Quote
Old 11-24-2009, 02:25 PM #6
Kaokin's Avatar
Member
 
Join Date: Oct 2009
Posts: 31
Rep Power: 0
Kaokin is infamous around these parts
Kaokin Kaokin is offline
Member
Kaokin's Avatar
 
Join Date: Oct 2009
Posts: 31
Rep Power: 0
Kaokin is infamous around these parts
Default Re: 1N4001 Diode Question --- Building a Test Load

Yah im not sure.... I just went to radio shack and found the only one that matched the diy description and thats what i purchased... here is a link to the actual product:

1N4001 Micro 1A Diodes - RadioShack.com

So to test the diode for Vf drop do i just set my DMM to DC Volts and measure across the diode or do i set it to Ohms or ? Sorry for the noob question, I dont know much about electronics
Kaokin is offline   Reply With Quote
Old 11-24-2009, 05:43 PM #7
HIMNL9's Avatar
Class 4 Laser
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
HIMNL9 HIMNL9 is offline
Class 4 Laser
HIMNL9's Avatar
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
Default Re: 1N4001 Diode Question --- Building a Test Load

I just have a doubt, at this point ..... is your DMM working good ? ..... put it on diode position and close the leads, if you read zero, or a little (very few) mV, it's ok, if you read, like, more than 004 or 005 mV with the leads in short circuit, then is the DMM the problem.

Also, some cheap units, if have half-charged batteries, instead stop to work, just false all the measures, so check also the DMM battery.
__________________
High Impulse Multipath Neutron Laser (mark 9 ) (LOL)
Dare mo mita koto no nai, kaze, kumo, suna, umi ..... Kokoro no hate no doko ka eien ga kagayaku.
HIMNL9 is offline   Reply With Quote
Old 11-24-2009, 07:45 PM #8
Meatball's Avatar
Class 3B Laser
 
Join Date: Feb 2008
Location: Lincoln, NE
Posts: 2,989
Rep Power: 242
Meatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond repute
Meatball Meatball is offline
Class 3B Laser
Meatball's Avatar
 
Join Date: Feb 2008
Location: Lincoln, NE
Posts: 2,989
Rep Power: 242
Meatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond reputeMeatball has a reputation beyond repute
Default Re: 1N4001 Diode Question --- Building a Test Load

You could also connect the diode to a 3V battery, along with 3, 10 ohm resistors or so, and then just read the voltage across the diode...
__________________
FIAT LUX

(\__/)
(='.'=)
(")_(")
Meatball is offline   Reply With Quote
Old 11-25-2009, 01:20 AM #9
Kaokin's Avatar
Member
 
Join Date: Oct 2009
Posts: 31
Rep Power: 0
Kaokin is infamous around these parts
Kaokin Kaokin is offline
Member
Kaokin's Avatar
 
Join Date: Oct 2009
Posts: 31
Rep Power: 0
Kaokin is infamous around these parts
Default Re: 1N4001 Diode Question --- Building a Test Load

The DMM doesnt seem to be the problem, its a digital autoranging DMM from sears, bought it a few years ago and it really hasnt seen much use, i paid like 50 bucks for it. I set it to the ohm setting and crossed the contact leads and got a measurement of 000.0. I Then set it to the diode setting, and tested across the diode both ways. One way read OL and the other way read 0.508v. So does this indicate a .508v Vf drop?? I just want to make sure i am using my DMM and reading this correctly. Thanks for all the help!!
Kaokin is offline   Reply With Quote
Old 11-25-2009, 08:19 PM #10
Junior Member
 
Join Date: Jul 2009
Posts: 6
Rep Power: 0
dirtbiketrailsrider is on a distinguished road
dirtbiketrailsrider dirtbiketrailsrider is offline
Junior Member
 
Join Date: Jul 2009
Posts: 6
Rep Power: 0
dirtbiketrailsrider is on a distinguished road
Default Re: 1N4001 Diode Question --- Building a Test Load

Quote:
Originally Posted by Kaokin View Post
thanks pyro, i was afraid you were going to say that What if i were to use them any way and just use fewer?? for example; the ckt recommends 6 x 0.7v diodes for a total of 4.2v of resistance. If i were to use 3 1.6v diodes in series that would give me 4.8v resistance which should be fine for a blu ray diode correct??
Go down to the test load description
It can be done - Laser driver
dirtbiketrailsrider is offline   Reply With Quote
Old 11-25-2009, 08:27 PM #11
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: 1N4001 Diode Question --- Building a Test Load

If they're 1N4001 diodes, then they will provide a .7V drop. It's that simple. There is no need to measure them or anything like that. As long as they are 1N4001 diodes, they will work. I would be surprised if RS put the wrong diodes in the package, so therefore as long as the package says they are 1N4001 diodes and the diodes themselves say 1N4001, they will work.
__________________
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 11-28-2009, 03:14 AM #12
Kaokin's Avatar
Member
 
Join Date: Oct 2009
Posts: 31
Rep Power: 0
Kaokin is infamous around these parts
Kaokin Kaokin is offline
Member
Kaokin's Avatar
 
Join Date: Oct 2009
Posts: 31
Rep Power: 0
Kaokin is infamous around these parts
Default Re: 1N4001 Diode Question --- Building a Test Load

ok thanks, Ill try making the test load and hope it works!! :::Crosses Fingers:::
Kaokin is offline   Reply With Quote
Old 11-28-2009, 04:21 AM #13
lasersbee's Avatar
Class 4 Laser
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,709
Rep Power: 40049
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: 15,709
Rep Power: 40049
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: 1N4001 Diode Question --- Building a Test Load

And if you need 1 Ohm Test Load resistors look here....

FREE 1 Ohm Test Load Resistors

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
Old 12-02-2009, 06:21 AM #14
aXit's Avatar
Class 1M Laser
 
Join Date: Sep 2009
Location: Sydney, Australia
Posts: 206
Rep Power: 16
aXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to behold
aXit aXit is offline
Class 1M Laser
aXit's Avatar
 
Join Date: Sep 2009
Location: Sydney, Australia
Posts: 206
Rep Power: 16
aXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to behold
Default Re: 1N4001 Diode Question --- Building a Test Load

Quote:
Originally Posted by ElektroFreak View Post
If they're 1N4001 diodes, then they will provide a .7V drop. It's that simple. There is no need to measure them or anything like that.
Not entirely true... Vf depends on current.



Link:1N400x Diode Family Forward Voltage
aXit is offline   Reply With Quote
Old 12-02-2009, 07:10 AM #15
HIMNL9's Avatar
Class 4 Laser
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
HIMNL9 HIMNL9 is offline
Class 4 Laser
HIMNL9's Avatar
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
Default Re: 1N4001 Diode Question --- Building a Test Load

^ True ..... and it's easy to see it, if you want to check what is in your test load ..... just connect it to a power supply that can change the current, and directly measure it on one of the diodes with different currents through the load.

Anyway, for the use that we do, the fact that it's 0.75 at low current and 0.9 at high current is not so important
__________________
High Impulse Multipath Neutron Laser (mark 9 ) (LOL)
Dare mo mita koto no nai, kaze, kumo, suna, umi ..... Kokoro no hate no doko ka eien ga kagayaku.
HIMNL9 is offline   Reply With Quote
Old 12-02-2009, 07:14 AM #16
aXit's Avatar
Class 1M Laser
 
Join Date: Sep 2009
Location: Sydney, Australia
Posts: 206
Rep Power: 16
aXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to behold
aXit aXit is offline
Class 1M Laser
aXit's Avatar
 
Join Date: Sep 2009
Location: Sydney, Australia
Posts: 206
Rep Power: 16
aXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to beholdaXit is a splendid one to behold
Default Re: 1N4001 Diode Question --- Building a Test Load

It was more to explain the .508V result that kaokin got.
aXit 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


LinkBacks (?)
LinkBack to this Thread: http://laserpointerforums.com/f51/1n4001-diode-question-building-test-load-45710.html
Posted By For Type Date
What is 1N4007 DIODE RADIO SHACK? This thread Refback 10-27-2013 09:04 AM
High Alpha, By Pilots For Pilots ? View topic - Simple 2 battery set up This thread Refback 09-26-2013 10:43 AM
What is 1N4007 DIODE RADIO SHACK? This thread Refback 03-11-2013 07:25 PM
Car Speakers Amplification This thread Trackback: 02-09-2011 07:57 AM










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 09:17 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