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 08-21-2007, 03:33 AM #17
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: "Glowtorch-type" mod (200mw 660nm red)

Looks like current regulation with no PD feedback.

Here are some more pics of mine.

Inside the head, the lens assembly, compared to a couple of DX modules


Paul


chimo is offline   Reply With Quote







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







Old 08-21-2007, 03:34 AM #18
Class 1 Laser
 
Join Date: Jun 2007
Posts: 81
Rep Power: 14
Bernhard is just really niceBernhard is just really niceBernhard is just really niceBernhard is just really nice
Bernhard Bernhard is offline
Class 1 Laser
 
Join Date: Jun 2007
Posts: 81
Rep Power: 14
Bernhard is just really niceBernhard is just really niceBernhard is just really niceBernhard is just really nice
Default Re: "Glowtorch-type" mod (200mw 660nm red)

Thank's chimo for cropping my picture and make it nicer

Can someone that have better knowledge of electronics help in drawing the schematics from the picture?

Gazoo, I believe that the LD is retained by ring from the back, and I don't know what did they use to held the ring against the diode. There is no notch in the retaining ring for twisting the ring, etc. You maybe right that simple push can knock the diode out, but there is no way to know without destroying the LD. I just didn't want to destroy good diode, and need to figure out some other way.
Maybe later when I have good powerful IR diode ready to transplant in there, I will try to mess up with it
Anyone know what is the highest power IR diode available in 5.6mm form?
Bernhard is offline   Reply With Quote
Old 08-21-2007, 03:38 AM #19
Class 1 Laser
 
Join Date: Jun 2007
Posts: 81
Rep Power: 14
Bernhard is just really niceBernhard is just really niceBernhard is just really niceBernhard is just really nice
Bernhard Bernhard is offline
Class 1 Laser
 
Join Date: Jun 2007
Posts: 81
Rep Power: 14
Bernhard is just really niceBernhard is just really niceBernhard is just really niceBernhard is just really nice
Default Re: "Glowtorch-type" mod (200mw 660nm red)

Chimo, I believe it is a current regulation without PD (Photo Diode) feedback as well.
I manage to make it brighter and burn better by turning the pot clockwise. There is no way to find out exactly how much brighter though, not until I get the LPM-1 from Daedal group buy...
Bernhard is offline   Reply With Quote
Old 08-21-2007, 03:41 AM #20
Class 1 Laser
 
Join Date: Jun 2007
Posts: 81
Rep Power: 14
Bernhard is just really niceBernhard is just really niceBernhard is just really niceBernhard is just really nice
Bernhard Bernhard is offline
Class 1 Laser
 
Join Date: Jun 2007
Posts: 81
Rep Power: 14
Bernhard is just really niceBernhard is just really niceBernhard is just really niceBernhard is just really nice
Default Re: "Glowtorch-type" mod (200mw 660nm red)

I really wish that I can put 9mm (T05) diode in there, and do something to increase current feed. This way, I can make cheap 1 Watt IR laser using this as a host...
Bernhard is offline   Reply With Quote
Old 08-21-2007, 03:54 AM #21
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: "Glowtorch-type" mod (200mw 660nm red)

Quote:
Originally Posted by Bernhard
Thank's chimo for cropping my picture and make it nicer

Can someone that have better knowledge of electronics help in drawing the schematics from the picture?
You are quite welcome. *

It looks like a common current control scheme (you could probably find a version at SAM's laser page) . *It's difficult to tell with the part numbers sanded off the chips, but I think it functions like this:

The chip marked DES is a transistor that "throttles" the current to the LD. *The small part that looks like a transistor is likely a stable voltage reference. *The larger IC is likely an op amp/comparitor (LM358?) that compares the voltage drop across the 1.5ohm sense resistor to a percentage of the reference voltage (through a voltage divider network - the 5k ohm pot allows some adjustment of the voltage divider). *If the voltage drop is too low, the op amp provides more base current to the LD drive transistor, if it is too high, it reduces the base drive.

The large, 4.7ohm resistor is just a voltage drop resistor. *It could be increased in size to allow for RCR123s. *As it sits, that resistor is dissipating around 200mW! *This is not a very efficient circuit.

Paul
chimo is offline   Reply With Quote
Old 08-21-2007, 05:15 AM #22
Class 1 Laser
 
Join Date: Jun 2007
Posts: 81
Rep Power: 14
Bernhard is just really niceBernhard is just really niceBernhard is just really niceBernhard is just really nice
Bernhard Bernhard is offline
Class 1 Laser
 
Join Date: Jun 2007
Posts: 81
Rep Power: 14
Bernhard is just really niceBernhard is just really niceBernhard is just really niceBernhard is just really nice
Default Re: "Glowtorch-type" mod (200mw 660nm red)

I think you are spot on regarding the IC type, chimo. On my first one, I can read first and second digit perfectly, and read a small bit of third digit, whick looks like a number 3.
On my second unit, the first, second, third digit are barely readable, and the forth digit show up a bit and I'm very positive that it is a 5.
To be certain, we only need to guess the last digit and compared it against the reference IC database from Philips. Further, once the schematics of this circuit is available, we can compare it to the reference circuit design of this IC somewhere from Philips website.
Bernhard is offline   Reply With Quote
Old 08-21-2007, 05:17 AM #23
Class 1 Laser
 
Join Date: Jun 2007
Posts: 81
Rep Power: 14
Bernhard is just really niceBernhard is just really niceBernhard is just really niceBernhard is just really nice
Bernhard Bernhard is offline
Class 1 Laser
 
Join Date: Jun 2007
Posts: 81
Rep Power: 14
Bernhard is just really niceBernhard is just really niceBernhard is just really niceBernhard is just really nice
Default Re: "Glowtorch-type" mod (200mw 660nm red)

I'm just wondering, which resistor need to be change to allow bigger current?
Will bigger current cause higher strain to that poor resistor, or it is the other way around, that it will have to "resist" lower current because of the higher current being supplied to the LD?
Bernhard is offline   Reply With Quote
Old 08-21-2007, 05:54 AM #24
Gazoo's Avatar
Class 3B Laser
 
Join Date: Jun 2007
Location: Dallas Tx
Posts: 3,199
Rep Power: 180
Gazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond repute
Gazoo Gazoo is offline
Class 3B Laser
Gazoo's Avatar
 
Join Date: Jun 2007
Location: Dallas Tx
Posts: 3,199
Rep Power: 180
Gazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond reputeGazoo has a reputation beyond repute
Default Re: "Glowtorch-type" mod (200mw 660nm red)

Bernhard,
Thanks for the explanation. I went back and looked at the pictures. Now I see what you meant by the ring that is holding the diode in. It does look like it was pressed in and would be a pain to get out. But I think it could be done if one needed to replace the diode.

Sorry I don't know what the most powerful infrared diode is in a 5.6mm can. I did a quick search and the highest I could find was 200mw cw. It almost looks from the pictures the housing could be modified to fit a 9mm diode.

If you changed the 4.7 ohm resistor to say a 3 ohm (for example) more current would flow through the circuit. The question is how much current can the driver board carry without damaging it.

Gazoo is offline   Reply With Quote
Old 08-21-2007, 09:57 AM #25
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: "Glowtorch-type" mod (200mw 660nm red)

There are a few methods to get a higher current:

1. adjust the pot
2. change the sense resistor
3. change the voltage divider

With a higher current, the 4.7 ohm dropping resistor will dissipate more heat as well. What current are you planning on driving the IR diode at?

Paul

Quote:
Originally Posted by Bernhard
I'm just wondering, which resistor need to be change to allow bigger current?
Will bigger current cause higher strain to that poor resistor, or it is the other way around, that it will have to "resist" lower current because of the higher current being supplied to the LD?
chimo is offline   Reply With Quote
Old 08-22-2007, 03:49 PM #26
Class 1 Laser
 
Join Date: Jun 2007
Posts: 81
Rep Power: 14
Bernhard is just really niceBernhard is just really niceBernhard is just really niceBernhard is just really nice
Bernhard Bernhard is offline
Class 1 Laser
 
Join Date: Jun 2007
Posts: 81
Rep Power: 14
Bernhard is just really niceBernhard is just really niceBernhard is just really niceBernhard is just really nice
Default Re: "Glowtorch-type" mod (200mw 660nm red)

Don't really sure yet. The IR diode I'm planning to buy are 9mm (T05) packaging, 1 Watt CW. Assuming that LD voltage are 2.5V, the current will need to be 400mW to achieve 1 Watt. Is this correct?
Bernhard is offline   Reply With Quote
Old 08-22-2007, 05:07 PM #27
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: "Glowtorch-type" mod (200mw 660nm red)

Bernhard,
Your calculation for power is correct, however, is "1W" a power consumption or optical output figure? The optical output will only be a fraction (very rough order of magnitude: 1/5 to 1/3) of the power consumed. Most of the power consumed is given up as heat.

The manufacturing/development push is to continue to creat more powerful packages with better efficiencies. The high-power LED industry has more than doubled efficiencies over the past few years.

Paul

Quote:
Originally Posted by Bernhard
Don't really sure yet. The IR diode I'm planning to buy are 9mm (T05) packaging, 1 Watt CW. Assuming that LD voltage are 2.5V, the current will need to be 400mW to achieve 1 Watt. Is this correct?
chimo is offline   Reply With Quote
Old 08-23-2007, 05:41 AM #28
Class 1 Laser
 
Join Date: Jun 2007
Posts: 81
Rep Power: 14
Bernhard is just really niceBernhard is just really niceBernhard is just really niceBernhard is just really nice
Bernhard Bernhard is offline
Class 1 Laser
 
Join Date: Jun 2007
Posts: 81
Rep Power: 14
Bernhard is just really niceBernhard is just really niceBernhard is just really niceBernhard is just really nice
Default Re: "Glowtorch-type" mod (200mw 660nm red)

I know there is something wrong in my calculation. That's why I keep wondering, where should the efficiency ratio fit in those figure? So assuming that the efficiency of LD is 25% (assuming from your data that it is getting the 780mW for 180mW output, and IR LD having the same efficiency lavel), it means the current will need to be 1600mA to drive 1W, is this correct? Don't know whether the circuit can withstand this, or it is capable of doing this with some mod...
Bernhard is offline   Reply With Quote
Old 08-23-2007, 09:16 AM #29
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: "Glowtorch-type" mod (200mw 660nm red)

The circuit seems well made and the pointer all together seems very sturdily put together. On the other hand... efficiency is very bad. I do not think I would leave the pointer on for too long for fear of the batteries blowing up! as it stands right now, I think I would be changing out the circuit on my pointer when it comes in. I don't like how this is being driven and I honestly think a better solution can easily be deduced. With a 6V supply, anything can be put in there. Effectively, a 4-stage current/voltage regulation circuit can be crammed on that board to make sure the diode doesn't see anything other than a ramp-up and ramp down at a very stable voltage and current. :-?

As about powering the IR diode with that circuit... I wouldn't go too far with that. It doesn't seem to be built efficient enough to supply that much and stay alive (the circuit or the diode).

Nevertheless, thank you both very very much for the pictures. They are very detailed, very clear, and gave me a very good idea of what to expect from the pointer that I will be getting soon

--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 08-23-2007, 06:06 PM #30
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: "Glowtorch-type" mod (200mw 660nm red)

You are quite welcome!

Paul

Quote:
Originally Posted by Daedal
Nevertheless, thank you both very very much for the pictures. They are very detailed, very clear, and gave me a very good idea of what to expect from the pointer that I will be getting soon

--DDL
chimo is offline   Reply With Quote
Old 08-23-2007, 11:42 PM #31
Junior Member
 
Join Date: Jul 2007
Posts: 5
Rep Power: 0
tmiller is on a distinguished road
tmiller tmiller is offline
Junior Member
 
Join Date: Jul 2007
Posts: 5
Rep Power: 0
tmiller is on a distinguished road
Default Re: "Glowtorch-type" mod (200mw 660nm red)

Is there any word on the lasers? The thread seems to have buried itself somewhere.

Regards,
Tom

Nevermind, I found it.

Tom
tmiller is offline   Reply With Quote
Old 08-27-2007, 04:23 AM #32
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: "Glowtorch-type" mod (200mw 660nm red)

I did a little more schematic tracing...


Better shot with hot melt glue removed.


Pot side


Note that PD leg has been cut off


My shot at tracing the schematic. *A real quick analysis: The pot wiper sets a voltage based on a fraction of the reference voltage. This voltage is compared to the voltage drop across the sense resistor. If the voltage across the sense resistor is too low, the second op amp provides more base drive current to the transistor to increase the current through the LD and the sense resistor. *This circuit is likely less than 50% efficient with fresh batteries (it will become more efficient as the batteries die).
There are several vias that had to be traced by continuity checks. *I upped the current from 208mA to 258mA.



Look what I picked up at a surplus electronics store (for those in Ottawa, that's "ADD Electronics&quot. * *The baggie in the background is 25-turn 10 ohm trimmer pots.
chimo 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 10:19 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