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Old 12-02-2013, 04:24 AM #529
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Default Re: Tesla Coil Build Thread

Quote:
Originally Posted by benmwv View Post
Going to post these board files and bom open source? Im interested in building one.
Yep, sure will.

Fair warning though; failure to get the exact parts in the BOM will yield unpredictable results. I had trouble early on in development when I thought that any old GDT primary side series cap of the right value would do. Swapped in my good old tried and true WIMA ones and it came right to life.


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Old 12-02-2013, 04:42 AM #530
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Exclamation Re: Tesla Coil Build Thread

Quote:
Originally Posted by Fiddy View Post
good stuff! yeah mine was similar at 267/334.

im planning a small spark gap coil for the holidays.

Reckon this will work?

I see a fatal flaw on this circuit,
The HV primary capacitor is directly across the HV output. This is a BIG no-no
Good way to back feed HV/HFeq into your mains.
This will kill the diode and driver circuit almost certainly.


My bad.. .already 2 people are explaining this point.. wooops.. I'm slow today.
Sparkgap in a SGTC ALWAYS goes across the HV leads and the tank cap where the spark gap is now.
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Old 12-02-2013, 04:45 AM #531
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Default Re: Tesla Coil Build Thread

Yep, spot on SL. I beat ya to it though, hehe.
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Old 12-02-2013, 05:03 AM #532
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Lightbulb Re: Tesla Coil Build Thread

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Originally Posted by Sigurthr View Post
Yep, spot on SL. I beat ya to it though, hehe.
oh... sorry I just restated it.



on a second note,
How's you coiling going btw?
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Old 12-02-2013, 05:06 AM #533
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Default Re: Tesla Coil Build Thread

hehe yeah thats for the back up tho Seoul_lasers

Im not using the ignition coil anymore, i found a stash of furnace ignition transformers today!

240VAC primary 9kV secondary @ 20mA
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Old 12-02-2013, 05:09 AM #534
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Exclamation Re: Tesla Coil Build Thread

Quote:
Originally Posted by Fiddy View Post
hehe yeah thats for the back up tho Seoul_lasers

Im not using the ignition coil anymore, i found a stash of furnace ignition transformers today!

240VAC primary 9kV secondary @ 20mA
Those will work... but they do have a tendency to burn out rather quickly.
Be warned you'll be replacing OBITs sooner than you think!

I used to build smaller coils with these.
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Old 12-02-2013, 05:11 AM #535
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Default Re: Tesla Coil Build Thread

ill keep that in mind, i found more than 10 of them so ill see how they go.
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Old 12-02-2013, 05:34 AM #536
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Default Re: Tesla Coil Build Thread

Howdy All

Say if any one here is making a rotary spark gap and needs Tungsten contacts I have plenty of 1/4" diameter Tungsten for sale

I can cut it to any length you need, 1" is the norm.

If you need some give me a PM as I will not see your post here.
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Old 12-02-2013, 05:34 AM #537
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Default Re: Tesla Coil Build Thread

Ya obits are fun, but boy oh boy are they fragile. I had better luck paralleling up several, it -seemed- to make them last longer.

WB btw SL, good to see ya around again =) . My coiling has been on hold for quite some time now due to financial issues. Life hasn't been kind. Oh and the mains grounds in my house failed recently and I can't afford to replace the wiring in the walls. I have my normally-TC-dedicated ground rod array hodge-podge wired into the mains circuit of my office to protect myself and my equipment, leaving my TCs sans RF ground. Woke up one day to find live mains on all my equipment chasis... that was NOT a fun day.

Anyway, I figured out why my audio modulation attempts always failed with my big SSTC; the secondary Q is way low. Relying on Slope Detection to demodulate FM/PWM into audible AM of the streamers/arc kind of requires the bandwidth slope response of the secondary to be sharp enough that significant amplitude is lost as the drive frequency moves away from the resonant frequency. Unfortunately, my coil barely loses 10% power moving as far as 50KHz away from f0. Hell, my PLL's lock range is only 50KHz (150-200KHz, f0 is 278KHz). This is why when I inject audio into the VCO of my PLL I get almost no audio on the output unless I overdrive the hell out of the VCO, even at 3kW of RF. When doing so the audio is so badly distorted that it defeats the purpose of audio modulation.

I'm planning to one day build a fixed frequency minimalistic low power coil that I'll PWM modulate the enable pins of the UCC chips on. I'm thinking I'll use a monolithic 1MHz oscillator to pump the UCC pair which will drive two mosfets in a Royer-esque topology (center tapped primary with the center fed by DC bus and the ends pulled to ground through the fets). The main feature of using a fixed frequency oscillator as the pump is that when the enable pins are brought low and oscillation at the secondary stops there is no gunk at the oscillation restart when the enable pins are brought high again. Normally the UCC chips ping the resonator while they are waiting for feedback signal to propagate back in to them to get oscillation going at the right frequency, but this is hell on the mosfets (I've witnessed 8MHZ! oscillation on the cycles before feedback gets going) and produces a lot of inefficiency. Time and money are the main limiters here though.

I'm also working on having my own universal SSTC driver boards commercially produced. It is a reinvention of Steve Ward's famous topology. No bells or whistles, just solid engineering designed to work. I so hated the multiple regulators and low voltage lines his drivers use. Also, I found his decoupling and RF feedback protection to be wanting. Fiddy has agreed to do the EagleCAD for me once I finish the schematic revisions and send it and the BOM his way. Time is the limiter here. I'm hoping to have the files all done before xmas (on my end, no rush on Fiddy).

I had a bunch of 1920s Triodes fall into my lap today and it is so damned tempting to try to make a nice oscillator or VTTC out of them. I don't have any of the usual accoutrements for power RF valves though, just tubes and filament supplies; not even any sockets. I don't think these have the plate dissipations needed for VTTC work anyway, but it would be cool to make a tube driven flyback driver.

How's your coiling been?
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Old 12-02-2013, 06:08 AM #538
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Default Re: Tesla Coil Build Thread

I have a few 12ax7 & 8 around here somewheres. About all they are good for is tube amps. Though sometimes they will do interesting things when near a Tesla coil. The conditions have to be just right to observe the 'Correa effect'. Exactly what those conditions are I'm not sure as I have only seen it once.

Did you ever get that little eBay coil going again Fiddy?
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Old 12-02-2013, 11:20 AM #539
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Default Re: Tesla Coil Build Thread

Put my replacement IGBT's in today with new aluminum oxide insulators.



Put my new tank cap in and tuned a bit, was 267/334 now its 334/321 more tuning to come soon.



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Old 12-08-2013, 01:27 AM #540
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Default Re: Tesla Coil Build Thread

Hey Fiddy,
I finalized the schematic today. Will start putting together the BOM soon now.

My hands are a little full debugging and designing a new white noise generator. The one we've been sleeping to for years is only pseudo-random and you can hear where it loops. Also, it generates some low frequency tones (100-600Hz) throughout its pseudo-random sequence, and they have higher gain than the rest of the spectrum. The result is really annoying sounds to sleep to, haha. I've got the basic white noise generator circuit hammered out, just need to design a proper semiconductor amplifier for it and construct it. Shouldn't take more than a day. Besides, the SSTC Driver BOM is not going to be fun, haha.
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Old 12-08-2013, 02:03 AM #541
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Default Re: Tesla Coil Build Thread

haha sounds like a very mysterious and powerful device and it's mystery is only exceeded by it's power.

let me know when you have a BOM and circuit diagram.
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Old 12-08-2013, 03:32 AM #542
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Default Re: Tesla Coil Build Thread

Is the pink noise generator shrouded in secrecy as well? I built one from a schematic on the web and
would be interested in how it differs from yours.
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Old 12-08-2013, 06:11 AM #543
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Default Re: Tesla Coil Build Thread

Haha, no my pink noise gen isn't shrouded. It is a true white noise gen though; DC through >40MHz. Once you pop a speaker on a low pass filter forms and anything over about 100KHz gets damped pretty well. Plus I doubt I'll be making an amp that'll do more than a couple MHz for it. I don't like the disproportionate weighting of pink noise gens (ones that aren't just white noise + low pass, anyway).

It's a basic NPN "noise diode" pair that is fed into a Class-A mosfet preamp. I'm probably going to make a simple LM386 Class-AB amp for it since I found a few 386's in my bin. When I get a chance I'll draw up a schematic and post it here for ya.

Btw, if you don't see it in a day or two feel free to post here asking for it, this thread is kind of my baby and activity here works well as a reminder as I always check new post notifications.
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Old 12-08-2013, 07:53 AM #544
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Default Re: Tesla Coil Build Thread

heres a quick test video of my ignition transformer.

unsure what type of duty cycle i should have with this guy, recommendations anyone?

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