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 > Gas Lasers



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



Reply
 
LinkBack Thread Tools Display Modes
Old 10-04-2010, 05:11 PM #1
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,144
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: 9,144
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 Powering a HeNe with an old CRT monitor

Weeeeee!



That is all.


__________________
A problem well stated is a problem half solved.
Cyparagon is online now   Reply With Quote







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







Old 10-04-2010, 05:14 PM #2
Event_Horizon's Avatar
Class 2 Laser
 
Join Date: Mar 2008
Location: Toronto, Canada
Posts: 477
Rep Power: 39
Event_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond repute
Event_Horizon Event_Horizon is offline
Class 2 Laser
Event_Horizon's Avatar
 
Join Date: Mar 2008
Location: Toronto, Canada
Posts: 477
Rep Power: 39
Event_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond repute
Default Re: Powering a HeNe with an old CRT monitor

Pretty neat. I'm surprised it's lasing, I didn't think the flyback in a CRT could source enough current. Nice work sir, I learned something new today.
__________________
www.laserglow.com
Event_Horizon is offline   Reply With Quote
Old 10-04-2010, 05:35 PM #3
hakzaw1's Avatar
Class 4 Laser
 
Join Date: Apr 2009
Location: 'Deep in the Heart Of Texas..."
Posts: 8,345
Rep Power: 27214
hakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond repute
hakzaw1 hakzaw1 is online now
Class 4 Laser
hakzaw1's Avatar
 
Join Date: Apr 2009
Location: 'Deep in the Heart Of Texas..."
Posts: 8,345
Rep Power: 27214
hakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond repute
Default Re: Powering a HeNe with an old CRT monitor

I am guessing this "PS" could be made much smaller--- could it power two HeNes like that? i have a pair that I want to make into lamps. these days you cant give away old monitors like that.

TY for sharing this-- hk
__________________
IF YOU ARE NEW HERE- READ ALL THIS http://laserpointerforums.com/f37/an...ml#post1353314
& Spend some hours reading at LASERPOINTERSAFETY.COM

powered by PANGOLIN-ILDA Member since 2014.

QS/FB3 +Beyond-APC40-Mamba Black(clone) 5paghettix2 and I-show x2-Kasio synth-midi
KGB- 532 1.1W 445 2.2W 655 1.3W DT Pro 40 still needs more red.
KGB1W+ 532 DT Pro 40 soon to be GB.
Laserking 1300RGB FULL COLOR 30K(may be FS)
Laserking RGB LK PD2 500 and LK SD 850
REKE RGB 500- G 300
HeNes-(12)R(3)G-COH-594/5 mW-thnx DrSam
MULTILINE-147mW[
445nm 180mW-Mini spiro-Yob.
LPMs-RadiantAlpha& Pro5W-AixiZ SPER/KenmeterLite/LB1
Spacelas 1178mW 655nm/AixiZ 300mW532&
2 B&W 473nm 5/6mW lab
JETLRS1.3W&1.2W-MGL-H
638 180mW ttl mimi lab (av. 230mW)
405 100mW ttl mini lab
445 300 mW ttl mni lab ^AixiZ^ all for a lumia PJ
*MightyMite 2000* RGB all diode 2.2W 30K- 637/520./450...NEW!!
Guide DIY Pjs by Dan-
http://nqlasers.com/scannerreference/index.php?title=Main_Page
hakzaw1 is online now   Reply With Quote
Old 10-04-2010, 06:46 PM #4
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,144
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: 9,144
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: Powering a HeNe with an old CRT monitor

Hell, it could power at least 4 of them in series. That's 25,000V or so. Not a good long-term idea though. I don't think the wave form is desirable.
__________________
A problem well stated is a problem half solved.
Cyparagon is online now   Reply With Quote
Old 10-04-2010, 08:08 PM #5
Bluefan's Avatar
Class 3R Laser
 
Join Date: Aug 2009
Location: The Netherlands
Posts: 1,482
Rep Power: 62
Bluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond repute
Bluefan Bluefan is offline
Class 3R Laser
Bluefan's Avatar
 
Join Date: Aug 2009
Location: The Netherlands
Posts: 1,482
Rep Power: 62
Bluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond repute
Default Re: Powering a HeNe with an old CRT monitor

I can't find the ballast resistor, what keeps it stable? And those wires don't look like high voltage cables, be very carefull with them.
Bluefan is offline   Reply With Quote
Old 10-05-2010, 03:38 AM #6
hakzaw1's Avatar
Class 4 Laser
 
Join Date: Apr 2009
Location: 'Deep in the Heart Of Texas..."
Posts: 8,345
Rep Power: 27214
hakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond repute
hakzaw1 hakzaw1 is online now
Class 4 Laser
hakzaw1's Avatar
 
Join Date: Apr 2009
Location: 'Deep in the Heart Of Texas..."
Posts: 8,345
Rep Power: 27214
hakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond reputehakzaw1 has a reputation beyond repute
Default Re: Powering a HeNe with an old CRT monitor

Quote:
Originally Posted by Cyparagon View Post
Hell, it could power at least 4 of them in series. That's 25,000V or so. Not a good long-term idea though. I don't think the wave form is desirable.
Guess I will forget that idea and look to find a good deal on two small brick PSs--what do they use to power them when they are inside of a barcode scanners that these old tubes usually come from?

thanks for any help,,,,,,,,,,,,,len
__________________
IF YOU ARE NEW HERE- READ ALL THIS http://laserpointerforums.com/f37/an...ml#post1353314
& Spend some hours reading at LASERPOINTERSAFETY.COM

powered by PANGOLIN-ILDA Member since 2014.

QS/FB3 +Beyond-APC40-Mamba Black(clone) 5paghettix2 and I-show x2-Kasio synth-midi
KGB- 532 1.1W 445 2.2W 655 1.3W DT Pro 40 still needs more red.
KGB1W+ 532 DT Pro 40 soon to be GB.
Laserking 1300RGB FULL COLOR 30K(may be FS)
Laserking RGB LK PD2 500 and LK SD 850
REKE RGB 500- G 300
HeNes-(12)R(3)G-COH-594/5 mW-thnx DrSam
MULTILINE-147mW[
445nm 180mW-Mini spiro-Yob.
LPMs-RadiantAlpha& Pro5W-AixiZ SPER/KenmeterLite/LB1
Spacelas 1178mW 655nm/AixiZ 300mW532&
2 B&W 473nm 5/6mW lab
JETLRS1.3W&1.2W-MGL-H
638 180mW ttl mimi lab (av. 230mW)
405 100mW ttl mini lab
445 300 mW ttl mni lab ^AixiZ^ all for a lumia PJ
*MightyMite 2000* RGB all diode 2.2W 30K- 637/520./450...NEW!!
Guide DIY Pjs by Dan-
http://nqlasers.com/scannerreference/index.php?title=Main_Page
hakzaw1 is online now   Reply With Quote
Old 10-05-2010, 05:42 AM #7
Class 4 Laser
 
Join Date: May 2007
Location: Queensland, AU
Posts: 7,549
Rep Power: 1100
Things has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond repute
Things Things is offline
Class 4 Laser
 
Join Date: May 2007
Location: Queensland, AU
Posts: 7,549
Rep Power: 1100
Things has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond repute
Default Re: Powering a HeNe with an old CRT monitor

A HeNe tube needs very little current, a flyback would easily run a few and even larger ones.

You can remove the transformer from the monitor and build it a driver circuit, making it much smaller (And even more powerful).

Unlike some other gas lasers, you don't really need to worry about stability with HeNe's.
Things is offline   Reply With Quote
Old 10-07-2010, 01:02 AM #8
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,442
Rep Power: 18470
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,442
Rep Power: 18470
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: Powering a HeNe with an old CRT monitor

I think most monitor flybacks would put out much more power than a HeNe tube is supposed to handle. Perhaps its useful for testing purposes, but i doubt the tube would last very long.
Benm is online now   Reply With Quote
Old 10-07-2010, 08:46 PM #9
Event_Horizon's Avatar
Class 2 Laser
 
Join Date: Mar 2008
Location: Toronto, Canada
Posts: 477
Rep Power: 39
Event_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond repute
Event_Horizon Event_Horizon is offline
Class 2 Laser
Event_Horizon's Avatar
 
Join Date: Mar 2008
Location: Toronto, Canada
Posts: 477
Rep Power: 39
Event_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond reputeEvent_Horizon has a reputation beyond repute
Default Re: Powering a HeNe with an old CRT monitor

My previous impression was that a flyback transformer could only source a few hundred uA, not the 5-8 mA needed to run a HeNe. Though the voltage is definitely 10x higher than it needs to be. That extra energy must be going somewhere... does the tube get unusually hot running like this?
__________________
www.laserglow.com
Event_Horizon is offline   Reply With Quote
Old 10-07-2010, 09:46 PM #10
Class 1M Laser
 
Join Date: Jun 2010
Location: Seattle, WA USA
Posts: 239
Rep Power: 27
james1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant future
james1095 james1095 is offline
Class 1M Laser
 
Join Date: Jun 2010
Location: Seattle, WA USA
Posts: 239
Rep Power: 27
james1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant future
Default Re: Powering a HeNe with an old CRT monitor

Quote:
Originally Posted by Event_Horizon View Post
My previous impression was that a flyback transformer could only source a few hundred uA, not the 5-8 mA needed to run a HeNe. Though the voltage is definitely 10x higher than it needs to be. That extra energy must be going somewhere... does the tube get unusually hot running like this?

In many monitors, the flyback is part of the resonant circuit that includes the horizontal deflection. Newer monitors supporting a wide range of horizontal scan frequencies will have a separate circuit though. A HeNe tube will load down the output voltage to whatever the tube likes, with the current limited mostly by the DC resistance of the secondary winding. There is a good chance that the drive circuit will fail (sometimes quite spectacularly) otherwise the flyback will probably overheat eventually.
james1095 is offline   Reply With Quote
Old 10-08-2010, 02:50 AM #11
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,144
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: 9,144
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: Powering a HeNe with an old CRT monitor

You might notice in the picture I don't even have the anode lead connected. It's just sitting about an inch from the head there so the tube never sees the full voltage. I guess you could say my ballast resistor is oxygen/nitrogen based.

Something else just for fun:

__________________
A problem well stated is a problem half solved.
Cyparagon is online now   Reply With Quote
Old 10-08-2010, 03:29 AM #12
Class 1M Laser
 
Join Date: Jun 2010
Location: Seattle, WA USA
Posts: 239
Rep Power: 27
james1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant future
james1095 james1095 is offline
Class 1M Laser
 
Join Date: Jun 2010
Location: Seattle, WA USA
Posts: 239
Rep Power: 27
james1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant future
Default Re: Powering a HeNe with an old CRT monitor

What you've essentially done is created an RF excited HeNe. The return path is capacitive coupling.
james1095 is offline   Reply With Quote
Old 12-29-2010, 03:35 PM #13
roddenberry's Avatar
Class 2 Laser
 
Join Date: Jun 2009
Location: Montreal
Posts: 365
Rep Power: 20
roddenberry has much to be proud ofroddenberry has much to be proud ofroddenberry has much to be proud ofroddenberry has much to be proud ofroddenberry has much to be proud ofroddenberry has much to be proud ofroddenberry has much to be proud ofroddenberry has much to be proud of
roddenberry roddenberry is offline
Class 2 Laser
roddenberry's Avatar
 
Join Date: Jun 2009
Location: Montreal
Posts: 365
Rep Power: 20
roddenberry has much to be proud ofroddenberry has much to be proud ofroddenberry has much to be proud ofroddenberry has much to be proud ofroddenberry has much to be proud ofroddenberry has much to be proud ofroddenberry has much to be proud ofroddenberry has much to be proud of
Default Re: Powering a HeNe with an old CRT monitor

Wow!!!

This I have to try! I happen to have a 20" TV that got recently retired from service. If I get my MG tube to lase, this will be an extremely cool experiment. So the flyback out is connected to the cathode and you're just waving the ground wire near the anode? Wouldn't there be some arcing?
- Robert
roddenberry is offline   Reply With Quote
Old 12-29-2010, 03:53 PM #14
Class 1M Laser
 
Join Date: Jun 2010
Location: Seattle, WA USA
Posts: 239
Rep Power: 27
james1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant future
james1095 james1095 is offline
Class 1M Laser
 
Join Date: Jun 2010
Location: Seattle, WA USA
Posts: 239
Rep Power: 27
james1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant future
Default Re: Powering a HeNe with an old CRT monitor

Quote:
Originally Posted by roddenberry View Post
Wow!!!

This I have to try! I happen to have a 20" TV that got recently retired from service. If I get my MG tube to lase, this will be an extremely cool experiment. So the flyback out is connected to the cathode and you're just waving the ground wire near the anode? Wouldn't there be some arcing?
- Robert

The output of the flyback is positive, so it would go to the anode of the tube. Yes, if you put a ground wire near anything it will arc.

I don't recommend doing this on a tube you care about. The peak voltage from the flyback is much higher than a HeNe tube requires. You can punch pinholes in the glass which will destroy the tube. I've done it to light bulbs before. The hole is microscopic but it lets air leak in.
james1095 is offline   Reply With Quote
Old 12-29-2010, 05:29 PM #15
Coherent Light's Avatar
Class 3R Laser
 
Join Date: Jul 2010
Location: Hill Country, TX
Posts: 2,185
Rep Power: 51
Coherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond repute
Coherent Light Coherent Light is offline
Class 3R Laser
Coherent Light's Avatar
 
Join Date: Jul 2010
Location: Hill Country, TX
Posts: 2,185
Rep Power: 51
Coherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond repute
Default Re: Powering a HeNe with an old CRT monitor

I have used a few flybacks to power HeNe's, and They provide plenty of juice! Did not use a monitor flyback, but TVs I think They might have a bit more umph. Actually it's a bit scary at 1st because the voltage is very high, and I just had them laying on the bench.

Hak You could use a flyback for the tube you have with no PS.
__________________
Coherent::
Coherent Light is offline   Reply With Quote
Old 12-29-2010, 05:36 PM #16
Class 1M Laser
 
Join Date: Jun 2010
Location: Seattle, WA USA
Posts: 239
Rep Power: 27
james1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant future
james1095 james1095 is offline
Class 1M Laser
 
Join Date: Jun 2010
Location: Seattle, WA USA
Posts: 239
Rep Power: 27
james1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant futurejames1095 has a brilliant future
Default Re: Powering a HeNe with an old CRT monitor

CRT computer monitors typically have a higher anode voltage, 25-35kV, while most TVs are in the 19-25kV range, but the TV flyback may be able to deliver more current as the screens are usually larger.

Yes, it will work, but you stand a good chance of damaging the tube or at least greatly reducing the life. HeNe tubes want a well regulated current source, and driving one with a TV flyback you don't really know what you're getting. For long term operation definitely use a proper power supply.
james1095 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 02:44 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