Laser Pointers

Welcome to Laser Pointer Forums!

Top 50 Laser Pointer Companies - Green Lasers Top 50 Laser Pointer Companies - Blue Lasers Top 50 Laser Pointer Companies - Red Lasers
Top 50 Laser Pointer Companies - Yellow Lasers Top 50 Laser Pointer Companies - Purple Lasers Top 50 Laser Pointer Companies - Orange Lasers
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



Go Back   Laser Pointer Forums - Discuss Laser Pointers > Off-Topic > Geeks' Corner

Sci-Fi-Lasers
Reply
 
LinkBack Thread Tools Display Modes
Old 03-13-2012, 08:55 AM   #1
Class 3B Laser
 
Fiddy's Avatar
 
Join Date: May 2011
Location: Down Under
Posts: 2,747
Rep Power: 267
Fiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond repute
Default Marx Generator!

G'day,

Got the parts for this the other day!

For all of use who do not know, a Marx Generator works by charging capacitors in parallel then discharging in series, when you discharge in series you will add the voltages of the capacitors up.


This is done by the spark gap between each capacitor.
here's a diagram:



How i put i all together:

12V Battery -> HV Generator -> Marx Generator -> Output!


They are quite simple to build, if you've got a HV supply already its even easier.



I used 7x 10kV 4.7nF Capacitors & 13x 1 M ohm capacitors, this one was just a test, i have 20x capacitors and 200x resistors waiting

Im currently using the per-assembled one that runs off 12VDC: MXA028: HIGH VOLTAGE DC GENERATOR BOARD 9-15 VDC PROJECT ASSEMBLED KIT | eBay



Thanks for looking!

Fiddy.
__________________
405nm - 1,910mW (6)
445nm - 15,895mW (15)
450nm - 370mW (2)
473nm - 110mW (2)
532nm - 1250mW (6)
632.8nm - 2mW (1)
637nm - 5105mW (8)
660nm - 1,850mW (5)
670nm - 600mW (1)
685nm - 40mW (1)
808nm - 2,700mW (3)
RGB - 400mW (1)

In Progress:
405nm - 500mW+ Kryton Groove
445nm - 2,000mW+ C-88
520nm - 50mW Ultrafire RL-118 SS
632.8nm - 0.5mW Mini HeNe

Safety Glasses
2x Eagle Pair OD4+ 190nm-540nm
2x Eagle Pair OD4+ 90-400nm & 580-760nm
OEM Lasers OD 5+ 190-435nm & 730-1085nm

LaserBee 5W Laser Power Meter


>Fiddy's Review/Tutorial/Build Compilation Thread<
>>FS: Custom Glow Rings<<
>>>Plasma Speaker Kits (High Frequency Audio Tesla Coil) reserve yours today!<<<

CajunLasers FTW!

Last edited by Fiddy; 03-13-2012 at 09:00 AM.
Fiddy is offline   Reply With Quote


lpp

Green Laser Companies

Blue Laser Companies

Red Laser Companies


Old 03-13-2012, 08:59 AM   #2
Class 3R Laser
 
sinner's Avatar
 
Join Date: Oct 2011
Location: Dubai, UAE
Posts: 2,427
Rep Power: 360
sinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond repute
Default Re: Marx Generator!

Thats so beautiful and the discharging sound is pure awesomeness.. Man are we Geeks !! XD
__________________
Sinner's Custom Laser Hosts
The Cypreus-EDC Series - All Copper Custom Laser Hosts and Prebuilt Kits.
The Cypreus-2x26650 IIIB - Coming Soon
sinner is online now   Reply With Quote
Old 03-13-2012, 09:04 AM   #3
Class 3B Laser
 
Fiddy's Avatar
 
Join Date: May 2011
Location: Down Under
Posts: 2,747
Rep Power: 267
Fiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond repute
Default Re: Marx Generator!

Haha we will rulz the world!
__________________
405nm - 1,910mW (6)
445nm - 15,895mW (15)
450nm - 370mW (2)
473nm - 110mW (2)
532nm - 1250mW (6)
632.8nm - 2mW (1)
637nm - 5105mW (8)
660nm - 1,850mW (5)
670nm - 600mW (1)
685nm - 40mW (1)
808nm - 2,700mW (3)
RGB - 400mW (1)

In Progress:
405nm - 500mW+ Kryton Groove
445nm - 2,000mW+ C-88
520nm - 50mW Ultrafire RL-118 SS
632.8nm - 0.5mW Mini HeNe

Safety Glasses
2x Eagle Pair OD4+ 190nm-540nm
2x Eagle Pair OD4+ 90-400nm & 580-760nm
OEM Lasers OD 5+ 190-435nm & 730-1085nm

LaserBee 5W Laser Power Meter


>Fiddy's Review/Tutorial/Build Compilation Thread<
>>FS: Custom Glow Rings<<
>>>Plasma Speaker Kits (High Frequency Audio Tesla Coil) reserve yours today!<<<

CajunLasers FTW!
Fiddy is offline   Reply With Quote
Old 03-13-2012, 09:14 AM   #4
Class 3R Laser
 
sinner's Avatar
 
Join Date: Oct 2011
Location: Dubai, UAE
Posts: 2,427
Rep Power: 360
sinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond reputesinner has a reputation beyond repute
Default Re: Marx Generator!

One day my friend, One day!!
__________________
Sinner's Custom Laser Hosts
The Cypreus-EDC Series - All Copper Custom Laser Hosts and Prebuilt Kits.
The Cypreus-2x26650 IIIB - Coming Soon
sinner is online now   Reply With Quote
Old 03-13-2012, 10:26 AM   #5
Class 3R Laser
 
jeffreythe00's Avatar
 
Join Date: Jan 2010
Location: USA, Plains, Pennsylvania
Posts: 2,406
Rep Power: 231
jeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond repute
Send a message via Skype™ to jeffreythe00
Default Re: Marx Generator!

So where do I pay?

Just kidding. Really nice! Wouldn't mind making one eventually .

__________________
Want to be a part of the member map? Pm me!

Personal lasers
800nm 40W PressTek INC Fiber Coupled Diode
660nm >100mW Newwish
635nm 500mW 501B
532nm 130mW Wicked Lasers Executive Pro: Nexus
532nm >150mW Jetlasers Ti B 532
532nm 100mW Aixiz TTL Tunable Lab Laser Click for more info
532nm >500mW Eudaimonium Custom
445nm >1W 1st Gen Kryton Groove
445nm >3W DeadEYmo Custom
405nm >50mW Newwish
473nm 7mW B&W Tek Labby
1064nm Passive Q-switch ND:YAG SSY-1 Multi KW Pulses.
10600nm 13W Air Cooled RF Excited Co2
Multiline >40mW 8 line JDSU Uniphase Small Frame Argon
Multiline Omnichrome 532 (Not working currently)
Wicked Lasers Torch
20W Coherent 200 LPM
RGB 500mW LK-PD Projector - PM Hakzaw1
if you'd like one!
jeffreythe00 is offline   Reply With Quote
Old 03-13-2012, 10:44 AM   #6
Class 3B Laser
 
Fiddy's Avatar
 
Join Date: May 2011
Location: Down Under
Posts: 2,747
Rep Power: 267
Fiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond repute
Default Re: Marx Generator!

hehe! they have to be the cheapest way to generate HV
__________________
405nm - 1,910mW (6)
445nm - 15,895mW (15)
450nm - 370mW (2)
473nm - 110mW (2)
532nm - 1250mW (6)
632.8nm - 2mW (1)
637nm - 5105mW (8)
660nm - 1,850mW (5)
670nm - 600mW (1)
685nm - 40mW (1)
808nm - 2,700mW (3)
RGB - 400mW (1)

In Progress:
405nm - 500mW+ Kryton Groove
445nm - 2,000mW+ C-88
520nm - 50mW Ultrafire RL-118 SS
632.8nm - 0.5mW Mini HeNe

Safety Glasses
2x Eagle Pair OD4+ 190nm-540nm
2x Eagle Pair OD4+ 90-400nm & 580-760nm
OEM Lasers OD 5+ 190-435nm & 730-1085nm

LaserBee 5W Laser Power Meter


>Fiddy's Review/Tutorial/Build Compilation Thread<
>>FS: Custom Glow Rings<<
>>>Plasma Speaker Kits (High Frequency Audio Tesla Coil) reserve yours today!<<<

CajunLasers FTW!
Fiddy is offline   Reply With Quote
Old 03-13-2012, 11:05 AM   #7
Class 3B Laser
 
bobhaha's Avatar
 
Join Date: May 2009
Location: Sydney, Australia
Posts: 3,236
Rep Power: 268
bobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond repute
Default Re: Marx Generator!

For "continuous" output....

__________________
Lasers!
10.6um - >40W CO2 Laser - 25W RF excited CO2 Laser*
685nm - Being built!
660nm - 250mW LOC PowerLight B50 Host - 100mW WL pulsar
635nm - 430mW C6 Host*
632.8nm - Red He-Ne laser ~1mW
593.5nm - Regal 5
542.8nm - Green He-Ne laser ~2.5mW
532nm - 620mW+ lasersman Firedragon III* - 100mW PGL-III-M from JETLASERS* - 70mW Rayfoss Host*
~~~ - 175mW Rayfoss Host - <5mW WL Core - 55mW DinoDirect review laser*

488nm - On the hoist
473nm - 2x CNI lab lasers ~40mW
445nm - 3W Big Boyz Laser - >1.1W Cree C6 Host - 650mW WL Arctic
405nm - 65mW GLP-405 Aquarius host - 160mW 6x Blu-ray MXDL Host
Total: 71,868.5 mW

Goggles!
Laser glow LSG-532-Sport protective eye goggles OD 7+ 190-532nm HIGHLY RECOMMENDED!!
Jetlasers wrap around 190-540nm OD4+ goggles*
Eagle Pair Red OD4+ goggles
Scopeguy20 Blublockers for 405nm lasers!

* indicates a review has been done, on this item.

Check out my How to Build a Selectable Dummy Load Thread!
bobhaha is offline   Reply With Quote
Old 03-13-2012, 02:25 PM   #8
Class 3R Laser
 
jeffreythe00's Avatar
 
Join Date: Jan 2010
Location: USA, Plains, Pennsylvania
Posts: 2,406
Rep Power: 231
jeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond reputejeffreythe00 has a reputation beyond repute
Send a message via Skype™ to jeffreythe00
Default Re: Marx Generator!

Quote:
Originally Posted by Fiddy View Post
hehe! they have to be the cheapest way to generate HV
Besides rubbing your shoes on the carpet?
__________________
Want to be a part of the member map? Pm me!

Personal lasers
800nm 40W PressTek INC Fiber Coupled Diode
660nm >100mW Newwish
635nm 500mW 501B
532nm 130mW Wicked Lasers Executive Pro: Nexus
532nm >150mW Jetlasers Ti B 532
532nm 100mW Aixiz TTL Tunable Lab Laser Click for more info
532nm >500mW Eudaimonium Custom
445nm >1W 1st Gen Kryton Groove
445nm >3W DeadEYmo Custom
405nm >50mW Newwish
473nm 7mW B&W Tek Labby
1064nm Passive Q-switch ND:YAG SSY-1 Multi KW Pulses.
10600nm 13W Air Cooled RF Excited Co2
Multiline >40mW 8 line JDSU Uniphase Small Frame Argon
Multiline Omnichrome 532 (Not working currently)
Wicked Lasers Torch
20W Coherent 200 LPM
RGB 500mW LK-PD Projector - PM Hakzaw1
if you'd like one!
jeffreythe00 is offline   Reply With Quote
Old 03-14-2012, 12:17 PM   #9
Class 3B Laser
 
LaZeRz's Avatar
 
Join Date: Feb 2011
Location: Sydney, Australia
Posts: 2,609
Rep Power: 122
LaZeRz has a reputation beyond reputeLaZeRz has a reputation beyond reputeLaZeRz has a reputation beyond reputeLaZeRz has a reputation beyond reputeLaZeRz has a reputation beyond reputeLaZeRz has a reputation beyond reputeLaZeRz has a reputation beyond reputeLaZeRz has a reputation beyond reputeLaZeRz has a reputation beyond reputeLaZeRz has a reputation beyond reputeLaZeRz has a reputation beyond repute
Send a message via MSN to LaZeRz
Default Re: Marx Generator!

Shoes and carpet aren't cheap
__________________
Stupid Australian Laser Laws.... Damn you customs

How to remove the PCB from protected cells

My Collection Of Beamshots and Laser Related pics!

Feel free to message me for any help/advice
LaZeRz is offline   Reply With Quote
Old 03-14-2012, 01:23 PM   #10
Class 3R Laser
 
Seoul_lasers's Avatar
 
Join Date: Jul 2008
Location: Victoria, British Columbia
Posts: 1,874
Rep Power: 130
Seoul_lasers has a reputation beyond reputeSeoul_lasers has a reputation beyond reputeSeoul_lasers has a reputation beyond reputeSeoul_lasers has a reputation beyond reputeSeoul_lasers has a reputation beyond reputeSeoul_lasers has a reputation beyond reputeSeoul_lasers has a reputation beyond reputeSeoul_lasers has a reputation beyond reputeSeoul_lasers has a reputation beyond reputeSeoul_lasers has a reputation beyond reputeSeoul_lasers has a reputation beyond repute
Send a message via Skype™ to Seoul_lasers
Exclamation Re: Marx Generator!

Quote:
Originally Posted by bobhaha View Post
For "continuous" output....

That's not a "Marx generator" thats a Stun gun schematic... Cockcroft–Walton (CW) generator .. sort of. Also known as a voltage Cascade multiplier circuit.

Can be quite dangerous. They've claimed a few TV repairmen in the old tube TV days.
__________________
650nm ~350mW DVD 20x diode RyanSoh3 Class IIIb
650nm ~350mW DVD 22x 3.5mm labby build 2010 Class IIIb
532nm 10mW-15mW DPSS Module IR filtered(S.Korea)RyanSoh3 Class IIIb
445nm 3.49W pk ~3.15W av. Sinner Cypreus II +DTR 9mm 445nm Class IV
445nm RHD Saber Twins 2.7W ~2.35W pk Class IV
445nm A140 module x2 Maxsink Class IV
405nm Daguin Kryton Groove SO6J 700mW build. Class IV
405nm Olike 560mW-600mW pen sold Scopeguy20
Class IV
337.1nm TEA Nitrogen laser project 2011 Class IIIb
---------------------------------------------------
Die4Drivers 1.3v lab laser/projector driver

Laserbee 3.2W Deluxe LPM
ARGMeter 1.1v
Ophir 20C-A sensor

Peregrine 1.5.0 is working now on MacOSX Yay!!
Seoul_lasers is offline   Reply With Quote
Old 03-14-2012, 01:33 PM   #11
Class 3B Laser
 
bobhaha's Avatar
 
Join Date: May 2009
Location: Sydney, Australia
Posts: 3,236
Rep Power: 268
bobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond repute
Default Re: Marx Generator!

Quote:
Originally Posted by Seoul_lasers View Post
That's not a "Marx generator" thats a Stun gun schematic... Cockcroft–Walton (CW) generator .. sort of. Also known as a voltage Cascade multiplier circuit.

Can be quite dangerous. They've claimed a few TV repairmen in the old tube TV days.
I know what it is. I was just giving some info for a "continuous" output source for HV.

As for any HV application... safety is non-negotiable..
__________________
Lasers!
10.6um - >40W CO2 Laser - 25W RF excited CO2 Laser*
685nm - Being built!
660nm - 250mW LOC PowerLight B50 Host - 100mW WL pulsar
635nm - 430mW C6 Host*
632.8nm - Red He-Ne laser ~1mW
593.5nm - Regal 5
542.8nm - Green He-Ne laser ~2.5mW
532nm - 620mW+ lasersman Firedragon III* - 100mW PGL-III-M from JETLASERS* - 70mW Rayfoss Host*
~~~ - 175mW Rayfoss Host - <5mW WL Core - 55mW DinoDirect review laser*

488nm - On the hoist
473nm - 2x CNI lab lasers ~40mW
445nm - 3W Big Boyz Laser - >1.1W Cree C6 Host - 650mW WL Arctic
405nm - 65mW GLP-405 Aquarius host - 160mW 6x Blu-ray MXDL Host
Total: 71,868.5 mW

Goggles!
Laser glow LSG-532-Sport protective eye goggles OD 7+ 190-532nm HIGHLY RECOMMENDED!!
Jetlasers wrap around 190-540nm OD4+ goggles*
Eagle Pair Red OD4+ goggles
Scopeguy20 Blublockers for 405nm lasers!

* indicates a review has been done, on this item.

Check out my How to Build a Selectable Dummy Load Thread!

Last edited by bobhaha; 03-14-2012 at 01:33 PM.
bobhaha is offline   Reply With Quote
Old 03-15-2012, 05:54 PM   #12
Class 3R Laser
 
Le Quack's Avatar
 
Join Date: Dec 2011
Location: Buffalo, NY
Posts: 1,192
Rep Power: 101
Le Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond repute
Send a message via MSN to Le Quack
Default Re: Marx Generator!

I don't quite see how that would work....the transformer is being driven in flyback topology, so the output would be just pulses, not true AC. There would be a little ringing down, but I don't think it would work too well.

Unless, you run it in resonance....
__________________
Does this look resonant to you?...
Le Quack is offline   Reply With Quote
Old 03-16-2012, 01:03 AM   #13
Class 4 Laser
 
Join Date: May 2007
Posts: 7,439
Rep Power: 648
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: Marx Generator!

Quote:
Originally Posted by Le Quack View Post
I don't quite see how that would work....the transformer is being driven in flyback topology ...

Unless, you run it in resonance....
Running it in flyback topology is technically running it in resonance, but only when you're using a feedback coil. Like the simple 2N3055 single transistor driver or whatever it is. That circuit isn't, which is why they specify a specific transformer resistance.

Last edited by Things; 03-16-2012 at 01:09 AM.
Things is offline   Reply With Quote
Old 03-16-2012, 01:17 AM   #14
Class 3R Laser
 
Le Quack's Avatar
 
Join Date: Dec 2011
Location: Buffalo, NY
Posts: 1,192
Rep Power: 101
Le Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond repute
Send a message via MSN to Le Quack
Default Re: Marx Generator!

It's not resonant unless you find the resonant frequency. The simple 2N3055 driver does NOT drive the flyback at resonance. The arcs would be a lot and i mean a LOT larger than what they typically are for that driver.

Flyback topology utilizes the inductance of the primary coil to cause a sort of avalanche of energy to appear on the secondary...usually it's just one polarity, positive, and maybe a little bit of ringing due to capacitance and inductance. The closer you get to the resonant frequency the higher the voltage and the more pronounced the ringing becomes, up until you're not even outputting pulses anymore but a sine wave.

Using one switch is called "quasi resonant" topology when it is outputting a sine.
__________________
Does this look resonant to you?...
Le Quack is offline   Reply With Quote
Old 03-16-2012, 01:30 AM   #15
Class 4 Laser
 
Join Date: May 2007
Posts: 7,439
Rep Power: 648
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: Marx Generator!

I dunno about you, but I've had some pretty massive arcs from the single transistor driver ..

The only way that driver works is because it relies on the flyback resonating. If it wasn't, the driver would just latch on continuously and pop the transistor. The feedback coil provides the resonant frequency switching, that's the idea. Drivers like the ZVS driver use the same method, however they have better switching circuitry to allow you to pump insane amounts of power into the transformer.

The resonant frequency changes as you draw an arc - you can hear the driver even adjust for this.

The principle of operation is as simple as the circuit itself: When power is applied, the transistor will conduct the current allowed through resistors into the flyback primary, causing it to induce a current on the secondary, and, at the same time, on the feedback winding. This feedback current will trigger the transistor to stop conducting, and as the magnetic field in the ferrite core collapses, a large HV spike will appear on the secondary windings (basic inductor action). But now there is no feedback current to keep the transistor off, so it will once again conduct, and the cycle will repeat, at a natural frequency that puts the transformer in resonance, resulting in enormous voltage gain. One of the advantages of having a feedback winding is that the circuit becomes dynamic: The frequency of operation is automatically adjusted to resonance, depending on many factors. It is interesting, because you can actually hear the frequency change as you draw an arc (high loads drop the frequency to a high pitched 20Khz whine which than becomes ultrasonic as the arc grows).

Last edited by Things; 03-16-2012 at 01:42 AM.
Things is offline   Reply With Quote
Old 03-16-2012, 02:30 AM   #16
Class 3R Laser
 
Le Quack's Avatar
 
Join Date: Dec 2011
Location: Buffalo, NY
Posts: 1,192
Rep Power: 101
Le Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond reputeLe Quack has a reputation beyond repute
Send a message via MSN to Le Quack
Default Re: Marx Generator!

That's wrong... because the driver works on saturation.

As the transistor is on, current flows, like what he said. The ferrite core eventually begins to saturate, eventually causing the feedback winding to stop feeding back. This turns the transistor off, and then as the core de-saturates, the transistor is allowed to turn back on (due to the biasing resistors) causing the cycle to repeat thousands of times a second. It's how camera flash inverters, joule thieves and single transistor flyback drivers work. As you draw an arc, you're changing the saturation current causing the transistor to turn off/on faster.

If the flyback was in resonance then the arcs would be enormous, like 7-9 cm long arcs. But they aren't, because of the way it works.


Now, for a ZVS driver, yes, that works on resonance; but only primary side resonance. If both the primary and secondary side are in resonance the flyback would explode or be destroyed from the huge amount of voltage buildup due to the lack of a load...resonance cancels out the inductance and capacitance causing only resistance to remain.

And that resistance doesn't do much to limit the voltage, so it rises to huge levels. That's actually how (some) Tesla Coils work too!
__________________
Does this look resonant to you?...

Last edited by Le Quack; 03-16-2012 at 02:31 AM.
Le Quack is offline   Reply With Quote
Reply


Database of Laser Pointer Companies




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


laser pointer forums top





Top 50 Laser Pointer Companies - Green Lasers Top 50 Laser Pointer Companies - Blue Lasers Top 50 Laser Pointer Companies - Red Lasers
Top 50 Laser Pointer Companies - Yellow Lasers Top 50 Laser Pointer Companies - Purple Lasers Top 50 Laser Pointer Companies - Orange Lasers
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





All times are GMT. The time now is 01:26 PM.


Powered by: vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2014 Laser Pointer Forums, LLC