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Old 12-15-2016, 03:16 PM #1729
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Default Re: Tesla Coil Build Thread

Quote:
Originally Posted by Down with Umbrella View Post
Yeah if your topload falls off it could possibly dent the nice aluminum spun torrid. If it falls on the primary and touches the secondary which is ground it will fry windings.
I can't be sure, but this might damage your NST as well.
You put the PFC CAP INFRONT OF YOUR NST. Low voltage mains. Not across the NST output.
I didn't think about denting the topload. I'm just curious what the cap in front of the NST does.

I also need to get the right value caps rather than six bottles, I need less wire to reduce inductance.

I'm probably going to be building this coil on a larger platform. Then I will be able to choose the height of the cool to change the tightness of the coupling.

There is sometime arcing from the primary to secondary wire after the last wind on its way to the ground wire so I'm going to put hot glue or something over that.


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Old 12-15-2016, 03:44 PM #1730
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Default Re: Tesla Coil Build Thread

Google "Power factor correction for inductive loads."
Read up on it.

Cut that first primary turn off or bend it down! Give yourself an inch, inch and a half on each sides. Incorporate a method to adjust coupling. You have to protect that secondary. That's possibly the most time consuming aspect of a tesla coil.

Run a thick wire to that 3/4" copper tubing. Not sure where you are but the ground could be frozen:/

I have a 10' copper coated stake pounded in the ground with a double 00 welding lead to ground my secondary. Hehe. Read far enough back in this thread and you'll see my struggles. (Pages in the 70s I think)
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Old 12-15-2016, 09:55 PM #1731
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Lightbulb Re: Tesla Coil Build Thread

Quote:
Originally Posted by Down with Umbrella View Post
Google "Power factor correction for inductive loads."
Read up on it.

Cut that first primary turn off or bend it down! Give yourself an inch, inch and a half on each sides. Incorporate a method to adjust coupling. You have to protect that secondary. That's possibly the most time consuming aspect of a tesla coil.

Run a thick wire to that 3/4" copper tubing. Not sure where you are but the ground could be frozen:/

I have a 10' copper coated stake pounded in the ground with a double 00 welding lead to ground my secondary. Hehe. Read far enough back in this thread and you'll see my struggles. (Pages in the 70s I think)

yup, indeed. The larger connection one can make to RF ground the better.

Just like to add that most modern XMFR based NSTs are PFC'd already. Some even have GFIs which make them useless in TC application.
Normal PFC = no PFC

Normal PFC / no GFI



@Crazlaser Have a look at the VA rating as it'll give a good idea about whether or not the XMFR
is PFC'd or non-PFC'd if it isn't already explicitly
written on the transformer case. As stated above.


As Down with Umbrella is suggesting, any part of copper primary elevated above the height of the primary turns is a recipe for a direct primary strike.
Too close to a secondary and you also risk a discharge between sec. and Primary.

-- This can be fatal to your tank circuit and transformer not to mention damage your secondary.

Additionally, the strike rail must never make a full loop as you'll be essentially creating a shorted turn. This will pull energy away from the primary.
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Last edited by Seoul_lasers; 12-15-2016 at 10:23 PM.
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Old 12-16-2016, 12:07 AM #1732
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Default Re: Tesla Coil Build Thread

Quote:
Originally Posted by Seoul_lasers View Post
yup, indeed. The larger connection one can make to RF ground the better.

Just like to add that most modern XMFR based NSTs are PFC'd already. Some even have GFIs which make them useless in TC application.
Normal PFC = no PFC

Normal PFC / no GFI



@Crazlaser Have a look at the VA rating as it'll give a good idea about whether or not the XMFR
is PFC'd or non-PFC'd if it isn't already explicitly
written on the transformer case. As stated above.


As Down with Umbrella is suggesting, any part of copper primary elevated above the height of the primary turns is a recipe for a direct primary strike.
Too close to a secondary and you also risk a discharge between sec. and Primary.

-- This can be fatal to your tank circuit and transformer not to mention damage your secondary.

Additionally, the strike rail must never make a full loop as you'll be essentially creating a shorted turn. This will pull energy away from the primary.
Thanks guys. The coil I've built is really junky. I am not going to invest more money building. I'm working on a slightly bigger one with a 14inchx3inch secondary. Everything on the current one is jury rigged even the wires are just taped with aluminum tape so I'm building another in which I can change the coupling. I'm using the same transformer and topload, however I do have an old topload made of duct and aluminum tape from a few years ago but it's 14 inch which may be too big.

If any of you tesla coil builders have Instagram and wanna see mine run pm me and I'll send you mine.
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My lasers
405nm 850mw BDR-209 C6 850mw
Sanwu 405nm 250mw Sanwu Pocket Series
445nm 1.3 watt 501b Sci-Fi lasers
445nm 1+ watt china generic laser (broken host)
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450nm 3mw LP450-1B
450nm 6w NUBM44 project box build (sold)
532nm 50mw laserbtb
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635nm 800mw Sanwu Challenger multimode
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Last edited by Crazlaser; 12-16-2016 at 08:42 AM.
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Old 12-22-2016, 12:19 AM #1733
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Default Re: Tesla Coil Build Thread

So I have been working on construction of this slightly larger coil. I built a multiple spark gap with copper tubes on a plastic sheet from home depot but it arced over so I build a slightly different multiple gap on the outside of 3" pvc pipe. Still 450va and the secondary I wound got scraped a damaged so it arcs across. I plan to just buy a 20 inch one on ebay. The one I made had 27 awg wire and was 14 inches tall. Would 30 awg wire at 20 inches tall work better? The height is adjustable so coupling can be changed. I'm still temporarily using the broken secondary and getting about one foot arcs to air with a breakout point. I have a lot of work to do and I don't have a line filter or pfc cap yet, nor a safety gap. I'll be constructing those soon.
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I have a laser for sale. All funds go towards a graduation senior trip.
PM me to buy. Will ship the same day most likely.


Brand new 16X BDR-209 405nm C6 laser 530ma for $110 850mw

Shipping is included.

My lasers
405nm 850mw BDR-209 C6 850mw
Sanwu 405nm 250mw Sanwu Pocket Series
445nm 1.3 watt 501b Sci-Fi lasers
445nm 1+ watt china generic laser (broken host)
445nm 2.9 watt Sanwu Silver Series
450nm 3mw LP450-1B
450nm 6w NUBM44 project box build (sold)
532nm 50mw laserbtb
532nm 301
532nm 70mw Pman
532nm 92mw Pman
635nm 800mw Sanwu Challenger multimode
638nm Oclaro 700mw build C6
650nm 250mw Sanwu Pocket Series multimode
Laserbtb 980nm 800mw
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Old 12-22-2016, 12:19 AM #1734
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Default Re: Tesla Coil Build Thread

So I have been working on construction of this slightly larger coil. I built a multiple spark gap with copper tubes on a plastic sheet from home depot but it arced over so I build a slightly different multiple gap on the outside of 3" pvc pipe. Still 450va and the secondary I wound got scraped a damaged so it arcs across. I plan to just buy a 20 inch one on ebay. The one I made had 27 awg wire and was 14 inches tall. Would 30 awg wire at 20 inches tall work better? The height is adjustable so coupling can be changed. I'm still temporarily using the broken secondary and getting about one foot arcs to air with a breakout point. I have a lot of work to do and I don't have a line filter or pfc cap yet, nor a safety gap. I'll be constructing those soon. Right now grounding is to a metal door frame outside or a downspout. I'm using a coaxial cable I found laying around that's like 20 feet long. Remember I'm working on a very limited budget so right now I can't afford better capacitors but I will probably add more as I'm only using 6 beer bottle caps. The strike rail is connected via the bottom of the secondary and the ground wire comes off the strike rail. And yes, the primary coil supports are made of wood against recommendation. Hopefully they won't get wet but right now I can't afford more cutting boards or plastic.
The arcing on the bottom right of the secondary is where some of the wire got pulled of into a loop. I secured the toroid with a plastic bolt I found in the plumbing section.
I used to touch the streamers but now I'm not anymore as I fear a streamer will hit the primary and connect me to the 60hz side of this thing.
The top platform can be raised up and down to change coupling and the secondary is mounted on a flange that is supported on 1/4 inch bolts, about 6 inches about the bottom platform. Everything is wired with low voltage 12-14 gauge wire and insulated with fish air tubing, for pumps, I think it's made of vinyl. Nearly all the connections are soldered and have heat shrink tubing on them. The legs of this thing are made of 1/4 inch threaded rod which is a bit too thin so when my budget allows I'll get 3/4th inch rod to make this thing a bit more rigid. I really should have built the entire thing on 1/2 inch plywood but I used 1/4 inch and it's pretty week. I may end up changing the bottom platform to 1/2 inch when I have the time and when funds allow but that wouldn't really be possible on the top platform because the primary coil supports are wood glued down with wood elmers glue.

edit: after running the coil for a while tonight it suddenly stopped. No hum of the transformer. My heart immediately sank and I took the coil inside for the night. I disconnected the capacitors are tried arcing the NST and it worked! I thought it was burnt out. After some troubleshooting I narrowed the culprit down to a shorted beer bottle cap, which after replacing, fixed the problem. A thing to note: an NST won't hum when it's shorted.
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Welcome

I have a laser for sale. All funds go towards a graduation senior trip.
PM me to buy. Will ship the same day most likely.


Brand new 16X BDR-209 405nm C6 laser 530ma for $110 850mw

Shipping is included.

My lasers
405nm 850mw BDR-209 C6 850mw
Sanwu 405nm 250mw Sanwu Pocket Series
445nm 1.3 watt 501b Sci-Fi lasers
445nm 1+ watt china generic laser (broken host)
445nm 2.9 watt Sanwu Silver Series
450nm 3mw LP450-1B
450nm 6w NUBM44 project box build (sold)
532nm 50mw laserbtb
532nm 301
532nm 70mw Pman
532nm 92mw Pman
635nm 800mw Sanwu Challenger multimode
638nm Oclaro 700mw build C6
650nm 250mw Sanwu Pocket Series multimode
Laserbtb 980nm 800mw
Eagle Pair goggles 190-540nm & 800-2000nm OD4
Crazlaser's Collection

Last edited by Crazlaser; 12-22-2016 at 03:13 AM.
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Old 12-22-2016, 04:27 PM #1735
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Lightbulb Re: Tesla Coil Build Thread

Quote:
Originally Posted by Crazlaser View Post
So I have been working on construction of this slightly larger coil. I built a multiple spark gap with copper tubes on a plastic sheet from home depot but it arced over so I build a slightly different multiple gap on the outside of 3" pvc pipe. Still 450va and the secondary I wound got scraped a damaged so it arcs across. I plan to just buy a 20 inch one on ebay. The one I made had 27 awg wire and was 14 inches tall. Would 30 awg wire at 20 inches tall work better? The height is adjustable so coupling can be changed. I'm still temporarily using the broken secondary and getting about one foot arcs to air with a breakout point. I have a lot of work to do and I don't have a line filter or pfc cap yet, nor a safety gap. I'll be constructing those soon.
hmm...
With the secondary arc breakout...
have a look at where the breakout is occurring and cover with several coats clear epoxy, then apply an overhead projector (clear plastic/usually PE) sheet overtop. This will arrest the sec-Primary discharge.

Hopefully the arcs have not carbonized the plastic underneath.

Edit:
To me this looks more like inter-arcing caused by an overlapping turn.
Please don't turn it on again without really having a good look.
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Laserbee 3.2W Deluxe LPM
ARGMeter 1.1v
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Last edited by Seoul_lasers; 12-22-2016 at 04:30 PM.
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Old 12-22-2016, 04:33 PM #1736
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Default Re: Tesla Coil Build Thread

It is an overlapping turn. As I said, it's a junky secondary I'm just using for tests before I get another pre-wound one from eBay.
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Welcome

I have a laser for sale. All funds go towards a graduation senior trip.
PM me to buy. Will ship the same day most likely.


Brand new 16X BDR-209 405nm C6 laser 530ma for $110 850mw

Shipping is included.

My lasers
405nm 850mw BDR-209 C6 850mw
Sanwu 405nm 250mw Sanwu Pocket Series
445nm 1.3 watt 501b Sci-Fi lasers
445nm 1+ watt china generic laser (broken host)
445nm 2.9 watt Sanwu Silver Series
450nm 3mw LP450-1B
450nm 6w NUBM44 project box build (sold)
532nm 50mw laserbtb
532nm 301
532nm 70mw Pman
532nm 92mw Pman
635nm 800mw Sanwu Challenger multimode
638nm Oclaro 700mw build C6
650nm 250mw Sanwu Pocket Series multimode
Laserbtb 980nm 800mw
Eagle Pair goggles 190-540nm & 800-2000nm OD4
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Old 12-23-2016, 07:13 AM #1737
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Default Re: Tesla Coil Build Thread

Quote:
Originally Posted by Crazlaser View Post
It is an overlapping turn. As I said, it's a junky secondary I'm just using for tests before I get another pre-wound one from eBay.
ah I misread the loop part. ..indeed an overlap as you indicated.
Good thing it is not a nice secondary and just for "testing purposes".

Good job on getting sparks.
At anyrate the next time you run a coil you'll know what to look out for... perhaps even try a homebrew MMC ?



I love sparks and arcs!
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Old 01-02-2017, 03:05 PM #1738
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Default Re: Tesla Coil Build Thread

Holy smokes we're tripping breakers.

Modifications:
Fixed 5khom resistor in series with a variable 5kohm rheostat to trim from 5-10kohm in the grid leak circuit for better tuning.

Item # 2. I added an ungodly large diode to the doubler circuit after the MOT. The little microwave diode was still kicking but could have given up the ghost any time.
Operation shunt punch commenced. I removed the shunts from an averaged size mot, No negligible difference except a higher current draw at the meter.





Abuse. This poor tube should call a help line!




What this coil really needs next is not necessarily more power but a more adequate secondary as I just used this one because it was left over from a sstc project.
-2 needs a staccato!

-3 Drastically improve efficiency and investigate the high current draw.

No more time for experimentation :/ off to work I go.

Last edited by Down with Umbrella; 01-02-2017 at 08:48 PM.
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Old 01-04-2017, 08:54 PM #1739
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Exclamation Re: Tesla Coil Build Thread

The mot without the shunts is what is pulling the large current here.

What you need is an inductive ballast on the primary side to limit your current draw like a smaller shunted mot
with the HV side shorted out. The power flows through the primary side of the windings. This should take your current draw down
to around 10-12A or so.

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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
450nm CarbonFiber ElectricPlasma build 9mm +6W Class IV
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!!

Last edited by Seoul_lasers; 01-05-2017 at 06:49 AM.
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