LPF Laser Pointer Company Database








Welcome to Laser Pointer Forums! If you are looking for a laser you may want to check out the database of laser pointer companies. The link will open in a new window for your convenience.

Green Laser Pointers Blue Laser Pointers Red Laser Pointers
Yellow Laser Pointers Violet Laser Pointers Orange Laser Pointers
Laser Pointers by Power - 1 Watt+ Laser Pointers by Power - 500mW+ 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

LPF Database of Laser Pointer Companies






Reply
 
LinkBack Thread Tools Display Modes
Old 05-12-2016, 02:29 AM #1665
Sigurthr's Avatar
Class 3B Laser
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 635
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Sigurthr Sigurthr is offline
Class 3B Laser
Sigurthr's Avatar
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 635
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Default Re: Tesla Coil Build Thread

Too bad it doesn't merge them into a single trace for differential, but that pic shows what I needed. Driver looks to be fine.

Now then, the next test would be to connect the GDT to the driver and scope the secondaries. This can be with the gdt disconnected or connected to the fets, as long as all the fets are good. Time to check the GDT, either way!


__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert
Sigurthr is offline   Reply With Quote








Old 05-12-2016, 06:01 AM #1666
Down with Umbrella's Avatar
Class 2M Laser
 
Join Date: Aug 2013
Location: Kennebunk, Maine
Posts: 934
Rep Power: 474
Down with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond repute
Down with Umbrella Down with Umbrella is online now
Class 2M Laser
Down with Umbrella's Avatar
 
Join Date: Aug 2013
Location: Kennebunk, Maine
Posts: 934
Rep Power: 474
Down with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond repute
Default Re: Tesla Coil Build Thread

Alright so, my next order of operation is:
leave 555 timer connected to driver-power timer and driver-with the GDT connected to driver, scope Gate drive transformer secondaries with duel channels.
Should I expect to see a 12v square wave at 4.5kHz? What will a failure look like? A choppy or saw tooth wave?
If one channel is NOT inverted will I see an inverted wf on the scope?

On the secondaries do I affix one probe and ground to the corresponding secondary or does the ground stay at pin one. Is impedance going to be an issue here?

Last edited by Down with Umbrella; 05-12-2016 at 03:00 PM.
Down with Umbrella is online now   Reply With Quote
Old 05-12-2016, 05:37 PM #1667
DashApple's Avatar
Class 3R Laser
 
Join Date: Jan 2009
Posts: 1,267
Rep Power: 653
DashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond repute
DashApple DashApple is online now
Class 3R Laser
DashApple's Avatar
 
Join Date: Jan 2009
Posts: 1,267
Rep Power: 653
DashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond reputeDashApple has a reputation beyond repute
Default Re: Tesla Coil Build Thread

Both channels on the scope should be non inverted and one waveform should be inverted to the other .
__________________
Now the tide is rising
And Im staring at the wake
I get this feeling inside and
I think that it might be too late
Theres nothing left to confide in
The only thing concrete is this weight
So Im stuck here deciding
How much more before I break

My heart is sinking like a stone
In an ocean of its own
You said Id never be alone
I guess I shouldve known
DashApple is online now   Reply With Quote
Old 05-12-2016, 07:09 PM #1668
Member
 
Join Date: Dec 2008
Posts: 30
Rep Power: 0
loneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond repute
loneoceans loneoceans is offline
Member
 
Join Date: Dec 2008
Posts: 30
Rep Power: 0
loneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond repute
Default Re: Tesla Coil Build Thread

Quote:
Originally Posted by Down with Umbrella View Post
Yes in the photo one one channel was inverted to the other. When I tested pin 6/7 I connected the ground clips to the (-) pin on the board rectifier.

I'm not exactly sure how to attach full res images to a thumb nail. Hope you can see what you need to here.
I got this wave form too
Maybe a mistaken pin
Good to finally see the schematic; looks exactly like what I thought it would be from looking at the photos. Your scope shots are fine (the recent one shows the invert as off) so it's what you should be expecting. By the way this is about *as simple* as any circuit can be (not just for coils but any circuit in general! - it's basically a 3 component circuit and 2 of them gate drivers are basically the same with one inverted) so I highly recommend you read the datasheets of each component and understand -exactly- what each of the signal lines should look like.

Sig, the toroid with 15 turns sounds just fine for 200kHz operation, but it will saturate around 42kHz at 0.2T flux saturation density as a limit.

Some comments on the schematic:
1. I still don't understand why the MUR1560s are necessary
2. You should add some reverse diodes across the gate resistors (e.g. 1N5819) I'm pretty sure you will be seeing some pretty severe shoot-through during each transition since there is no dead time.
3. MUR860s need to be soldered as CLOSE as possible to the MOSFET.

DwU, check out this schematic pioneered by Steve Ward for a very basic SSTC
http://www.stevehv.4hv.org/SSTC5/miniSSTCfnlsch.JPG

It's essentially the same but uses the 5V 74HC version of the inverter. It also has a very simply 555 interrupter circuit which I encourage you to put together, which acts as the interrupter.

See this page for more information: The Mini SSTC

The only thing I would change in that design (it's from 2007) is to swap out the IRFP460 FETs for something newer, and the reverse diodes. The big TO264 fets you have here are a pretty good if not a bit expensive part.

Quote:
Originally Posted by Down with Umbrella View Post
Alright so, my next order of operation is:
leave 555 timer connected to driver-power timer and driver-with the GDT connected to driver, scope Gate drive transformer secondaries with duel channels.
Should I expect to see a 12v square wave at 4.5kHz? What will a failure look like? A choppy or saw tooth wave?
If one channel is NOT inverted will I see an inverted wf on the scope?

On the secondaries do I affix one probe and ground to the corresponding secondary or does the ground stay at pin one. Is impedance going to be an issue here?
Your GDT will fail at 4.5kHz due to saturation but I encourage you to try it out to see how the waveforms will look like . (Here are the answers: http://www.richieburnett.co.uk/temp/gdt/gdt2.html). You'll need to drive it at a higher frequency to get your 'nice' square wave. Do try to draw out what you think the signals will look like on each leg of the circuit. It's very straightforward in this case and will help you a lot when you build your next coil.

Good luck with your coil

Last edited by loneoceans; 05-12-2016 at 07:15 PM.
loneoceans is offline   Reply With Quote
Old 05-13-2016, 02:01 AM #1669
Sigurthr's Avatar
Class 3B Laser
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 635
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Sigurthr Sigurthr is offline
Class 3B Laser
Sigurthr's Avatar
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 635
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Default Re: Tesla Coil Build Thread

Quote:
Originally Posted by loneoceans View Post
Sig, the toroid with 15 turns sounds just fine for 200kHz operation, but it will saturate around 42kHz at 0.2T flux saturation density as a limit.
Good to know, thanks!
Quote:
Originally Posted by loneoceans View Post
Some comments on the schematic:
1. I still don't understand why the MUR1560s are necessary
2. You should add some reverse diodes across the gate resistors (e.g. 1N5819)
1. I empirically found it stopped catastrophic bridge failure when driving capacitive loads. It isn't necessary and adds some cost/complexity, but in the seven or so physical iterations I've included it in there were no failures at all so I figure it's a safe precaution.
2. Yep that's a good addition. I had some issues with parasitic capacitance for very high frequency coils (>1MHz) so I didn't include it in the general design parameters.

All good data/suggestions though, no complaints here, Gao. =)
__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert
Sigurthr is offline   Reply With Quote
Old 05-13-2016, 05:25 AM #1670
Down with Umbrella's Avatar
Class 2M Laser
 
Join Date: Aug 2013
Location: Kennebunk, Maine
Posts: 934
Rep Power: 474
Down with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond repute
Down with Umbrella Down with Umbrella is online now
Class 2M Laser
Down with Umbrella's Avatar
 
Join Date: Aug 2013
Location: Kennebunk, Maine
Posts: 934
Rep Power: 474
Down with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond repute
Default Re: Tesla Coil Build Thread

That is a good link to Richards website. I've looked at it before but it's very relevant to what I'm doing right now.
Roger on that regarding the diodes across the resistors(two diodes [1N5819s] arcoss the gate resistors R1 & r2 in sigs schematic?)
And for further clarification the MUR15S60s are not needed?
There has been some confusion on my part as to which diodes can and cannot be omitted. In the schematic we have the 8s60s and the 15s60s. We also talked about the "body isolation" diodes mounted directly on my current fets.

Next/later I'm going to build a PCB board bridge. I have two 40mm x 40mm rectangular water blocks I might use on the Fets to isolate them from each other.
Because of the parts I have on hand I would like to use sigs PCB bridge design.
Loneocean, if i use Steve wards design can I run my coil at 1.3kW. ? That was a pretty good goal I had. It was working briefly :/

Last edited by Down with Umbrella; 05-13-2016 at 05:33 AM.
Down with Umbrella is online now   Reply With Quote
Old 05-13-2016, 07:43 AM #1671
Sigurthr's Avatar
Class 3B Laser
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 635
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Sigurthr Sigurthr is offline
Class 3B Laser
Sigurthr's Avatar
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 635
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Default Re: Tesla Coil Build Thread

The optional diodes are the ones in series with the FETs. They are "safe" to omit, but they really don't have any negative (detrimental) aspect other than heating up the heatsink a bit more. If you omit them and run into the capacitive region, it can blow the entire bridge.

The only significant differences between Ward's design and mine are the series FET protection diodes, mine has better FETs (his limit power to around 500W peak), and he uses a crude oscillation starter comprised of a capacitively coupled 555 timer. The real problem is the latter, as it required a lot of adjusting and fiddling to get it to work right. He later omitted the 555 circuit from his revised designs because of this. His work was truly pioneering, but it's worth observing the entire timeline of this topology to learn from the things he learned. Anyway, Ward's circuit with my FETs should have roughly the same peak power capability as my design, it's just a bit less efficient and has different cost and part count. Since I use large dc-blocking caps on my bridge design there is more smoothing to the DC which increases average power.

If you just omit the series diodes you basically have Ward's design sans the 555 oscillation starter. If you use a PLL as the input to the antenna jack on my driver you've basically got Uzzors' driver in a modular form.
__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert
Sigurthr is offline   Reply With Quote
Old 05-14-2016, 01:53 AM #1672
Member
 
Join Date: Dec 2008
Posts: 30
Rep Power: 0
loneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond repute
loneoceans loneoceans is offline
Member
 
Join Date: Dec 2008
Posts: 30
Rep Power: 0
loneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond reputeloneoceans has a reputation beyond repute
Default Re: Tesla Coil Build Thread

Quote:
Originally Posted by Down with Umbrella View Post
That is a good link to Richards website. I've looked at it before but it's very relevant to what I'm doing right now.
Roger on that regarding the diodes across the resistors(two diodes [1N5819s] arcoss the gate resistors R1 & r2 in sigs schematic?)
And for further clarification the MUR15S60s are not needed?
There has been some confusion on my part as to which diodes can and cannot be omitted. In the schematic we have the 8s60s and the 15s60s. We also talked about the "body isolation" diodes mounted directly on my current fets.

Next/later I'm going to build a PCB board bridge. I have two 40mm x 40mm rectangular water blocks I might use on the Fets to isolate them from each other.
Because of the parts I have on hand I would like to use sigs PCB bridge design.
Loneocean, if i use Steve wards design can I run my coil at 1.3kW. ? That was a pretty good goal I had. It was working briefly :/
Sig made some good summarizing points and if you follow the steps I think you'll do just fine.

Steve's design is basically the same as the USSTC. The only difference is the use of the 5V part instead of the higher voltage inverter but essentially no difference.

The hard part about making something run at 1.3kW is typically heating (i.e. your FETs will get very hot.) You need to get heatsinking done properly. I'll recommend simply making a very basic interrupter to play with first before going CW mostly due to cooling which requires a robust gate drive and good mechanical design.
loneoceans is offline   Reply With Quote
Old 05-14-2016, 04:44 AM #1673
Down with Umbrella's Avatar
Class 2M Laser
 
Join Date: Aug 2013
Location: Kennebunk, Maine
Posts: 934
Rep Power: 474
Down with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond repute
Down with Umbrella Down with Umbrella is online now
Class 2M Laser
Down with Umbrella's Avatar
 
Join Date: Aug 2013
Location: Kennebunk, Maine
Posts: 934
Rep Power: 474
Down with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond repute
Default Re: Tesla Coil Build Thread

We'll see how things pan out. Right now I'm working seven 12hour days so I have very limited time to TC.
Loneoceans, I have the advanced modular from EVR! I haven't soldered it up because it is low priority until I can get the coil to at least light.
My interrupter is getting interrupted by my work schedule! Errrrrf
Down with Umbrella is online now   Reply With Quote
Old 05-21-2016, 07:49 AM #1674
Down with Umbrella's Avatar
Class 2M Laser
 
Join Date: Aug 2013
Location: Kennebunk, Maine
Posts: 934
Rep Power: 474
Down with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond repute
Down with Umbrella Down with Umbrella is online now
Class 2M Laser
Down with Umbrella's Avatar
 
Join Date: Aug 2013
Location: Kennebunk, Maine
Posts: 934
Rep Power: 474
Down with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond repute
Default Re: Tesla Coil Build Thread

I didn't omit any components but I totally rebuilt the whole bridge over and tidied up connections. I also did away with that copper plate I was so attached to .
For the best.
All plexiglass brackets and plates + some nylon screws. Plenty of Arctic silver five.
Two additional heat sinks were added to the freewheeling diodes. Just another variable to isolate.


Here are the IN5819s soldered across the gate resistors( I< - >I )
The DMM reads 4.xx Mohms of resistance between the diodes. Not exactly a dead short but pretty low. Could two 4007s be used here instead?

Last edited by Down with Umbrella; 05-21-2016 at 12:32 PM.
Down with Umbrella is online now   Reply With Quote
Old 05-24-2016, 03:50 AM #1675
Sigurthr's Avatar
Class 3B Laser
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 635
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Sigurthr Sigurthr is offline
Class 3B Laser
Sigurthr's Avatar
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 635
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Default Re: Tesla Coil Build Thread

Wait wait wait. Why do you have diodes between two gates? Definitely not good. I think you misunderstood Loneoceans' comment about diodes.

You put the diode reverse polarity (anode to gate) across that particular gate's resistor. Let me see if I can ascii it for you:
Code:
[GDT Lead]----/////----[gate]
        |------|<|-------|
The pipes (|) are connections to the above nodes (GDT and gate). Basically the diode shorts out the gate resistor when the gate is higher voltage than the GDT lead (FET turn off).
__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert

Last edited by Sigurthr; 05-24-2016 at 03:51 AM.
Sigurthr is offline   Reply With Quote
Old 05-24-2016, 04:50 AM #1676
Down with Umbrella's Avatar
Class 2M Laser
 
Join Date: Aug 2013
Location: Kennebunk, Maine
Posts: 934
Rep Power: 474
Down with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond repute
Down with Umbrella Down with Umbrella is online now
Class 2M Laser
Down with Umbrella's Avatar
 
Join Date: Aug 2013
Location: Kennebunk, Maine
Posts: 934
Rep Power: 474
Down with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond repute
Default Re: Tesla Coil Build Thread

Oh, it's too late. I already put power to the bridge andddd nothing happened. I understand now where the diodes go now. Hopefully no damage was done:/
Still no light. With either bridges I have available. I think it's time to rewrap/adjust the primary winding.

Last edited by Down with Umbrella; 05-24-2016 at 05:02 AM.
Down with Umbrella is online now   Reply With Quote
Old 05-24-2016, 06:20 AM #1677
Sigurthr's Avatar
Class 3B Laser
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 635
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Sigurthr Sigurthr is offline
Class 3B Laser
Sigurthr's Avatar
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 635
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Default Re: Tesla Coil Build Thread

Eh, in my very sleep deprived state right now I'm trying to mentally picture the current paths of the (faulty) arrangement with the diodes and predict if there will be a failure. I'm drawing a blank right now, heh, sorry. Instinct says it's probably ok as that diode arrangement would act as a capacitor and only interfere with gate drive a bit and not conduct bridge bus power anywhere. Cut 'em out, retest and/or put 'em in correctly.

Pri could be damaged but it's unlikely. Really what you need now is a signal generator of sine or square wave that can go up to the coil's f0. Just put that into the USSTCC antenna input and you'd have an instant answer about the bridge.

What frequency was the f0 again? I might have something laying around on a shelf...
__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert
Sigurthr is offline   Reply With Quote
Old 05-24-2016, 01:03 PM #1678
Down with Umbrella's Avatar
Class 2M Laser
 
Join Date: Aug 2013
Location: Kennebunk, Maine
Posts: 934
Rep Power: 474
Down with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond repute
Down with Umbrella Down with Umbrella is online now
Class 2M Laser
Down with Umbrella's Avatar
 
Join Date: Aug 2013
Location: Kennebunk, Maine
Posts: 934
Rep Power: 474
Down with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond repute
Default Re: Tesla Coil Build Thread

I actually have a frequency generator on the way. I ordered on off flea bay and apparently it can drive up to 25Mhz.
Unfortunately it got shipped to Maine not Illinois but should be here any day.
F0 was 222kHz.
Down with Umbrella is online now   Reply With Quote
Old 07-30-2016, 01:43 AM #1679
Down with Umbrella's Avatar
Class 2M Laser
 
Join Date: Aug 2013
Location: Kennebunk, Maine
Posts: 934
Rep Power: 474
Down with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond repute
Down with Umbrella Down with Umbrella is online now
Class 2M Laser
Down with Umbrella's Avatar
 
Join Date: Aug 2013
Location: Kennebunk, Maine
Posts: 934
Rep Power: 474
Down with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond reputeDown with Umbrella has a reputation beyond repute
Default Re: Tesla Coil Build Thread

Update, Update.
The half bridge coil has been operating wonderfully.
The past couple weeks I've been working on a timer and have experimented with different duty cycles.
----------
I have had some free time on my hands so I decided why not make an attempt at a full bridge. With left over material and wire I decided to do something more compact.
Well, it's been a tight fit but that's half the fun. Literally.
This coil will run <800w. The coil, w/ a small top load should resonate just under 300kHz.


I used a pentafiliar GDT. It's been phased and tested to be working with an oscilloscope and waveform generator.
Due to lack of space this layout uses a small PC fan but the heatsink is pretty big. I'm hoping that will buy me time as I keep the duty cycles relatively short.

I suppose for ease of mounting I lined up all the MOSFETS in stead of the traditional H configuration.

I have a large 3300uF 450V capacitor just behind the rectifier.
Designing the bridge I have bounced between Kaizer's SSTC II and Steve wards designs



Questions, comments, concerns? Nothing is bolted down yet except for the bridge soldering. The upper deck will be secured with aluminum angle. My male C-14 sockets aren't in yet.
One thing I'm slightly nervous about is the rectifier heat sink is on the small side. I don't have a lot of experience calculating how hot that component will get. No doubler. Should only be seeing standard house main.
Thanks friends.
__________________
"Rosemary had an accident." TDWP

Down with Umbrella is online now   Reply With Quote
Old 07-30-2016, 03:00 AM #1680
Sigurthr's Avatar
Class 3B Laser
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 635
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Sigurthr Sigurthr is offline
Class 3B Laser
Sigurthr's Avatar
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 635
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Default Re: Tesla Coil Build Thread

Quote:
Originally Posted by Down with Umbrella View Post
... full bridge...

...This coil will run <800w....
Lol. Hope you like low coupling or lots and lots of primary turns! Remember, Lpri is the main factor for primary current and thusly Po.


Quote:
Originally Posted by Down with Umbrella View Post
One thing I'm slightly nervous about is the rectifier heat sink is on the small side. I don't have a lot of experience calculating how hot that component will get. No doubler. Should only be seeing standard house main.
Thanks friends.
Measure (or look up) the Vf of the rectifier. Once you've calculated the RMS current desired (from Lpri and F0). Rectifier thermal power waste = Vf * Ipri(rms). Find the thermal resistance of the rectifier and the heatsink on datasheets and find out how many degrees the device will rise in temperature at the waste power figure, if it exceeds maximum temperature you need better cooling or to reduce load. =)

Btw, make sure you fix the phasing error from our email.
__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert

Last edited by Sigurthr; 07-30-2016 at 03:01 AM.
Sigurthr is offline   Reply With Quote
Reply

Tags
coil, nikola, resonant, tesla, transformer





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/f60/tesla-coil-build-thread-73702.html
Posted By For Type Date
camper: Tesla Coil Build Thread - Page 3 - Laser Pointers This thread Refback 11-12-2015 12:06 PM
????? ???????? ? ???????? ???? - ????? ? ????? ? ??????? This thread Refback 05-11-2015 06:40 AM
ؿ SDRAM̿ؼ ϴµ..Ÿ ȸ : ̹ α This thread Refback 04-16-2015 02:23 PM
ѻ : ̹ α This thread Refback 04-15-2015 03:19 AM
̹ α : Ʈ Comment Ʈ This thread Refback 04-14-2015 04:33 AM
Форум РадиоКот Просмотр темы - Качер и опыты с качером This thread Refback 01-30-2015 07:03 PM










Loading








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




Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 01:14 AM.


Powered by: vBulletin
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2016 Laser Pointer Forums, LLC