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 > Experiments & Modifications



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



Reply
 
LinkBack Thread Tools Display Modes
Old 12-14-2007, 03:52 PM #1
rog8811's Avatar
Class 3B Laser
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
rog8811 rog8811 is offline
Class 3B Laser
rog8811's Avatar
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
Default Testing DDl's circuit

I am about to post a "How To" on testing DDL's circuit before adding the LD, I hope it is all pretty clear and with no errors. Those members who have been there, done that, would you please let me know if you disagree with anything therein.

Regards rog8811
*Edit Circuit layout attached to help with circuit testing

Attached Thumbnails
Testing DDl's circuit-lm317_components01_002.jpg  


__________________
See all of my videos on Vimeo
http://www.vimeo.com/4454150

Lots of tutorials and information on lasers
http://www.rog8811.com/

In the land of the blind the one eyed man..... is most likely holding the laser

Last edited by rog8811; 05-05-2009 at 05:12 PM.
rog8811 is offline   Reply With Quote







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







Old 12-14-2007, 03:53 PM #2
rog8811's Avatar
Class 3B Laser
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
rog8811 rog8811 is offline
Class 3B Laser
rog8811's Avatar
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
Default Re: Testing DDl's circuit

I have seen so many threads recently posing questions on the expected output of DDL's circuit.

I thought maybe a picture would paint a thousand words

Things to check before you start testing

1) Is it wired correctly?

2) Is there enough voltage? (Rule of thumb 6v for reds 9v for blue)

3) If supply is via batteries, are they fresh? (Used ones may sag and effect your measurements)

Now to test it out......

4) Attach the 4 diodes and resistor to where LD will eventually connect. If your reverse diode and capacitor are already connected to your LD you can connect your test assembly to the output from your fixed resistor and the neg of the battery.

5) Turn the pot to maximum resistance (then back off the pot a turn if it is a 25 turn one to ensure the wiper is not right on the end of the resistor track)

6) With your DVM set to volts attach red and black leads as shown at either end of the diodes. Turn on supply, now wind your pot right up to see if the voltage doesn't exceed your required voltage.

7) Turn off the supply, change range on DVM to mv and attach red and black as shown either end of resistor. Turn on supply and the mv reading will be equal to the maximum milliamps that your LD would see, now wind the pot resistance up to check that the reading reduces smoothly down to the lowest mw, which equals the lowest ma your LD will see.

8) You can also connect your DVM, set to volts across the Vout and Vadj pins of the regulator, you should read 1.25v (thanks rckstr)

9) If all seems OK leave the pot at max resistance, disconnect the supply and remove your test assembly.

10) VERY IMPORTANT! If your capacitor is not connected directly to your diode (in other words it is already in the circuit with your regulator) you MUST short out the + and - at the output with a piece of wire to discharge the capacitor. Failure to do so will blow your LD as you connect it up!

The rest of the set up is up to you, the above only checks that the circuit works correctly.


Regards rog8811

Attached Thumbnails
Testing DDl's circuit-ddl_circuit_test01_001.jpg  
__________________
See all of my videos on Vimeo
http://www.vimeo.com/4454150

Lots of tutorials and information on lasers
http://www.rog8811.com/

In the land of the blind the one eyed man..... is most likely holding the laser

Last edited by rog8811; 05-05-2009 at 05:13 PM.
rog8811 is offline   Reply With Quote
Old 12-14-2007, 05:36 PM #3
rkcstr's Avatar
Class 3R Laser
 
Join Date: Dec 2007
Posts: 1,368
Rep Power: 142
rkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond repute
rkcstr rkcstr is offline
Class 3R Laser
rkcstr's Avatar
 
Join Date: Dec 2007
Posts: 1,368
Rep Power: 142
rkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond reputerkcstr has a reputation beyond repute
Default Re: Testing DDl's circuit

Oops... realized this isn't the place to post problems, you're just asking if it sounds good....

It does to me... didn't see any errors.

Also may mention to measure the voltage between the Vout and Vadj pin to measure reference voltage to see if your supply is adequate.
__________________
Laser drivers and Test Loads - rkcstr.com

Enter discount code "LPF" during checkout to save 10% off of the regular prices!
rkcstr is offline   Reply With Quote
Old 12-15-2007, 02:01 AM #4
Class 2 Laser
 
Join Date: Nov 2007
Posts: 270
Rep Power: 11
member02 is on a distinguished road
member02 member02 is offline
Class 2 Laser
 
Join Date: Nov 2007
Posts: 270
Rep Power: 11
member02 is on a distinguished road
Default Re: Testing DDl's circuit

omg! thanks you soo much!!! I'm finally figuring this crap out, lol, thanks!

now if only someone would do the same thing using the 7805 regulator!!!! gotta find something to with these things I bought!
member02 is offline   Reply With Quote
Old 12-15-2007, 09:16 AM #5
rog8811's Avatar
Class 3B Laser
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
rog8811 rog8811 is offline
Class 3B Laser
rog8811's Avatar
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
Default Re: Testing DDl's circuit

I set my 7805 circuit up in exactly the same way, excluding the ref v measurment.

The thing to remember is that 7805 must be configured as constant voltage not CC and needs around 7.2v input to drive a blue ray.

I have not tried it for red LD's as I feel there is no point when the LM317 does it so well.

Regards rog8811
[edit]Years later.... test load schematic added[/edit]

Attached Thumbnails
Testing DDl's circuit-test_load01_004.jpg  
__________________
See all of my videos on Vimeo
http://www.vimeo.com/4454150

Lots of tutorials and information on lasers
http://www.rog8811.com/

In the land of the blind the one eyed man..... is most likely holding the laser

Last edited by rog8811; 05-05-2009 at 05:14 PM.
rog8811 is offline   Reply With Quote
Old 12-15-2007, 02:08 PM #6
Class 2 Laser
 
Join Date: Nov 2007
Posts: 270
Rep Power: 11
member02 is on a distinguished road
member02 member02 is offline
Class 2 Laser
 
Join Date: Nov 2007
Posts: 270
Rep Power: 11
member02 is on a distinguished road
Default Re: Testing DDl's circuit

isn't that dummy load designed to best match the red diode?

would I just have to add a few more 1N4001s to make it like a bluray?
member02 is offline   Reply With Quote
Old 12-15-2007, 04:14 PM #7
Class 2M Laser
 
Join Date: Aug 2007
Posts: 790
Rep Power: 23
a_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to behold
a_pyro_is a_pyro_is is offline
Class 2M Laser
 
Join Date: Aug 2007
Posts: 790
Rep Power: 23
a_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to beholda_pyro_is is a splendid one to behold
Default Re: Testing DDl's circuit

Quote:
Originally Posted by member02
isn't that dummy load designed to best match the red diode?

would I just have to add a few more 1N4001s to make it like a bluray?
A good dummy load for a BluRay seems to be 4 green LEDs in a 2x2 parallel-series config.


_______/----LED----LED----\_________
\----LED----LED----/

(`')
I \/ ASCII art
a_pyro_is is offline   Reply With Quote
Old 12-15-2007, 04:21 PM #8
Class 2M Laser
 
Join Date: Jun 2007
Posts: 650
Rep Power: 16
chimo is a jewel in the roughchimo is a jewel in the roughchimo is a jewel in the roughchimo is a jewel in the rough
chimo chimo is offline
Class 2M Laser
 
Join Date: Jun 2007
Posts: 650
Rep Power: 16
chimo is a jewel in the roughchimo is a jewel in the roughchimo is a jewel in the roughchimo is a jewel in the rough
Default Re: Testing DDl's circuit

You could also use a 1/4Watt 100 ohm resistor for a BluRay dummy load. It is fairly close to the dynamic resistance of the BluRay when running at around 40-50mA. You can also calculate the current in your head by measuring the voltage and dividing by 100.
chimo is offline   Reply With Quote
Old 12-16-2007, 06:17 PM #9
Class 1M Laser
 
Join Date: Aug 2007
Posts: 179
Rep Power: 15
Cxrazy is a glorious beacon of lightCxrazy is a glorious beacon of lightCxrazy is a glorious beacon of lightCxrazy is a glorious beacon of lightCxrazy is a glorious beacon of light
Cxrazy Cxrazy is offline
Class 1M Laser
 
Join Date: Aug 2007
Posts: 179
Rep Power: 15
Cxrazy is a glorious beacon of lightCxrazy is a glorious beacon of lightCxrazy is a glorious beacon of lightCxrazy is a glorious beacon of lightCxrazy is a glorious beacon of light
Default Re: Testing DDl's circuit

This helped me.

A lot.

I'm rebuilding mine, and well see how it turns out. 8-)
__________________
σ φ ε

405nm - 445nm - 532nm - 632.8nm HeNe - 650nm
Cxrazy is offline   Reply With Quote
Old 12-16-2007, 06:30 PM #10
rog8811's Avatar
Class 3B Laser
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
rog8811 rog8811 is offline
Class 3B Laser
rog8811's Avatar
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
Default Re: Testing DDl's circuit

Thanks for the additional input guys, as long as the good stuff is located on page one it may remain a useful thread.

To those for whom this is helpful with their projects, I am glad to have been of assistance.



Regards rog8811
__________________
See all of my videos on Vimeo
http://www.vimeo.com/4454150

Lots of tutorials and information on lasers
http://www.rog8811.com/

In the land of the blind the one eyed man..... is most likely holding the laser
rog8811 is offline   Reply With Quote
Old 12-16-2007, 07:06 PM #11
jayrob's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Northern CA, U.S. Astrophotography! (Some of my Photos)
Posts: 9,851
Rep Power: 3922
jayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond repute
jayrob jayrob is online now
Class 4 Laser
jayrob's Avatar
 
Join Date: Sep 2007
Location: Northern CA, U.S. Astrophotography! (Some of my Photos)
Posts: 9,851
Rep Power: 3922
jayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond reputejayrob has a reputation beyond repute
Default Re: Testing DDl's circuit

Quote:
Originally Posted by rog8811
Thanks for the additional input guys, as long as the good stuff is located on page one it may remain a useful thread.

To those for whom this is helpful with their projects, I am glad to have been of assistance.



Regards rog8811
Good stuff Rog! You know I will be marking this thread. Thanks for doing this...
Jay
__________________
Personal lasers:
(just a few - too many to list) RPL 425, Sypder III Krypton, RPL 35 (473), GLP-473, GLP-593.5, HeNe 632.8,
Many DIY 445, red, blu-ray, green, 635, and 450 builds...


Looking for a DIY kit?


Take a look at some of my more popular kits linked in color...

* FS: 405-G-1 Glass Lens Mod for Blu-ray! 31% increase in power vs AixiZ acrylic!

* FS: New! 1000 Lumen XML-2 Maglite Modification With Voltage Monitor! - Parts or Complete Light! Must see!

* FS: Polished Stainless Steel Green Kit! Easy assembly in minutes!

* FS: Large Maglite Monster Kits! Side Button Forward Clicky! Custom Head Option! Gnarly...


Click here for a list of my build kits! Projects and tutorials too!

jayrob is online now   Reply With Quote
Old 12-17-2007, 02:06 PM #12
Class 2 Laser
 
Join Date: Nov 2007
Posts: 303
Rep Power: 17
desslok is a splendid one to beholddesslok is a splendid one to beholddesslok is a splendid one to beholddesslok is a splendid one to beholddesslok is a splendid one to beholddesslok is a splendid one to behold
desslok desslok is offline
Class 2 Laser
 
Join Date: Nov 2007
Posts: 303
Rep Power: 17
desslok is a splendid one to beholddesslok is a splendid one to beholddesslok is a splendid one to beholddesslok is a splendid one to beholddesslok is a splendid one to beholddesslok is a splendid one to behold
Default Re: Testing DDl's circuit

Quote:
Originally Posted by rog8811
Thanks for the additional input guys, as long as the good stuff is located on page one it may remain a useful thread.

To those for whom this is helpful with their projects, I am glad to have been of assistance.



Regards rog8811
Good info Rog8811. I wish I had found this info before I spent a bunch of time chasing my tail. Luckily you and some others responded in a thread I made.
desslok is offline   Reply With Quote
Old 12-22-2007, 02:32 AM #13
Class 3R Laser
 
Join Date: May 2007
Posts: 2,277
Rep Power: 175
Daedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond repute
Daedal Daedal is offline
Class 3R Laser
 
Join Date: May 2007
Posts: 2,277
Rep Power: 175
Daedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond reputeDaedal has a reputation beyond repute
Default Re: Testing DDl's circuit

Excellent!

Yet another great write-up by Rog

Hopefully once I get away from all the GB's (soon), I'll be contributing some more as well...

--DDL
__________________
____________________________________________
Daedal Lasers... NEW LOWER PRICES... LPF Coupon = LPF10OFF
________________________________
CLICK ME -- LASORB is now available for immediate purchase
________________________________
Daedal is offline   Reply With Quote
Old 12-27-2007, 12:07 AM #14
ice ice is offline
Junior Member
 
Join Date: Nov 2007
Posts: 13
Rep Power: 0
ice is on a distinguished road
Send a message via ICQ to ice
ice ice is offline
Junior Member
 
Join Date: Nov 2007
Posts: 13
Rep Power: 0
ice is on a distinguished road
Send a message via ICQ to ice
Default Re: Testing DDl's circuit

hey guys, any ideas how to discharge end capacitor after power - off [smiley=huh.gif] ? I mean placing a discharging resistor across cap, or to use dual switch for power, AND shorting cap . would that work? . I blew my LD by forgetting to discharge that damn cap
ice is offline   Reply With Quote
Old 12-27-2007, 12:38 AM #15
Class 2 Laser
 
Join Date: Nov 2007
Posts: 317
Rep Power: 11
xanatos is on a distinguished road
xanatos xanatos is offline
Class 2 Laser
 
Join Date: Nov 2007
Posts: 317
Rep Power: 11
xanatos is on a distinguished road
Default Re: Testing DDl's circuit

???... The cap SHOULD discharge through the diode when you power off. I've never had a problem with cap discharge except when I accidentally unplugged & replugged the diode into it's socket WHILE the circuit was energized...???

Dave

xanatos is offline   Reply With Quote
Old 12-27-2007, 12:42 AM #16
ice ice is offline
Junior Member
 
Join Date: Nov 2007
Posts: 13
Rep Power: 0
ice is on a distinguished road
Send a message via ICQ to ice
ice ice is offline
Junior Member
 
Join Date: Nov 2007
Posts: 13
Rep Power: 0
ice is on a distinguished road
Send a message via ICQ to ice
Default Re: Testing DDl's circuit

Quote:
Originally Posted by xanatos
???... The cap SHOULD discharge through the diode when you power off. I've never had a problem with cap discharge except when I accidentally unplugged & replugged the diode into it's socket WHILE the circuit was energized...???

Dave
yeah, but Im thinking of another way to discharge cap. I powered on/off circuit without LD, and cap held charge which killed LD after I connected it.
ice 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/f42/testing-ddl-s-circuit-26349.html
Posted By For Type Date
laser circuit Page 3 : Light Laser LED Circuits :: Next.gr This thread Refback 04-13-2015 09:40 PM
> circuits > testing ddl s circuit l29273 - Next.gr This thread Refback 06-29-2014 09:18 PM
laser circuit Page 2 : Light Laser LED Circuits :: Next.gr This thread Refback 04-03-2014 05:25 PM










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 08:44 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