Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Topics - Fumeaux

Pages: [1]
1
Solid state Tesla coils / tesla coil varnish is dumb
« on: July 14, 2019, 05:29:10 PM »
Dear High Voltage Forum!

Some time ago I started to wind a new coil. I chose a PU-dispersion paint, which turned out to be a mistake. My guess is that normal PU-paint would have worked, but the watersolvable-dispersion-stuff didn't. Now my coil has countless fingernail wide cracks. I don't think that is that big of an issue, as I have a layer of electricaltape underneath to make it structurally sound. But I'm still worried about the insulation aspect. That's why I'm asking for your thoughts on this.



Does anybody think is should fix it? And what do you suggest?

I can't reccomend this lacker.

2
Dual Resonant Solid State Tesla coils / Secondary Design Tool
« on: April 14, 2019, 08:00:59 AM »
Hi everyone!

Yesterday I created an excel sheet that should help anyone to get a fitting secondary design. The idea is that you only need to know a secondary radius and the programm calculates everything from there. In reality you need to know coil length, diameter and wire diameter, but my tool helps you with the other two variables.

Here is the link: https://drive.google.com/file/d/1_ASlYX6LFijzV-2bQJYmVhX-QVutM4oa/view?usp=sharing

It is not done yet, as I'm still working on it. I would like to get some feedback on the conditional colouring and if you find any mistakes/have any ideas please let me know. I checked one coil with javatc already and everything seems like it works. Btw: I used Mads Sheet to create mine, but it isn't just copy and paste.

Tutorial:
1.) You enter your coil "Wanted Diameter" and "Wanted Ratio" in the two black boxes on the top. Then you go down and look where you have green fields and not yellow ones.
2.) Now you will have to find the wirediameter left to the green box(es) and copy the nearest wirediameter (you can buy) into the grey box "Global Wire Diameter". That is all of your input done.
3.) Now you can look to the right. The area where the two green areas intercect is your safety area.
Any of these coils should work fine.


I think I will create some sort of software which will then export the double green rows into javatc format. That shouldn't be too hard.

3
Solid state Tesla coils / The Adventures of Skinny Coil
« on: March 31, 2019, 11:01:53 PM »
Hi Guys. So this is my first Tesla Coil Thread. I've started a few thread already concerning my coil, but they were never centered around the build as a whole.

This paragraph is a short backstory about me and my coil. You can skip it without missing out on any technical details. So who am I? I was born in the city of Vienna. Went to school and now I study IT. It was when I was around 16 years old when I first came into contact with tesla coil (no direct contact). My Physics teacher comes from Croatia and guess who was also born in Croatia? Yeah right, my teacher. I guess that's why he was always talking about tesla and his inventions. That's when I googled tesla coils and realized the classical tesla coil was quite a simple schematic and I thought I can build one too. And building one I did. First came designing. Smart me thought transformers get higher voltage with more turns therefore I need a lot of turns. Playing with javatc I ran a few designs until I settled on what my current coil is. 3000 Turns and as copperwire is expensive I made the coil on a 7.5cm pvc pipe and ~45cm of turns. The absolute worst part about my design was the winding process. I swear to god it took me 16h handwinding without any pipe holder. I guess not many people can say they rotated a pvc pipe 3000 times. There was another not really bad nor really good aspect of my design. It was always intended to have another pvc pipe (11cm) over my coil itself to protect against sparks damaging the coil. I have to say that is works good against sparks, but 3000turn of 0.15mm copper wire have quite a high resistance which then intern produces quite a lot of heat which gets trapped by my outer pipe. All in all a sub optimal coil, but it is what it is. For now, it works. I've already learned a lot from my project and want to see how far I can push my little coil. So here they begin, the Adventures of Skinny Coil.

Some specs:
-) ~3000turns of 0.15mm dia copper wire
-) 7.5cm dia pvc pipe with winding length of ~45cm
-) ~130kHz (old toroid topload)
-) ~200kHz (new topload)

* skinny coil.pdf

The driver:
-) modded Steve Ward 5 (sec feedback, flip-flop, 1000uF on the 12V rail, ucc3732x heatsinks)

The bridge:
-) chinese "irfp460" (blown)
-) irfp450 (blown)
-) fgh40n60smd halfbridge

The spark:
70VAC -> 5-6cm


Current news:
2kVA variac on its way (should arrive friday)

4
Sell / Buy / Trade / WTS [EU]: UD2.7 thru hole pcb
« on: March 23, 2019, 02:12:48 PM »
I ordered 10 ud2.7 board from jlcpcb for ~10€ and want to sell some of the empty boards as I will (probably) never have 10 drsstc running at the same time.


The pcb was designed by profdc9. His github-project: https://github.com/profdc9/DRSSTC-PCB-Pack

I don't want to make a profit so I will just sell them to the first people to respond for the postal fee (I live in central europe).
For now I will have 7 boards for sale.


If anyone has a problem with this please let me know. I don't want to make enemies.

5
Solid state Tesla coils / Chinese MOSFETS/IGBTS
« on: March 22, 2019, 05:51:55 PM »
EDIT: Just to clear things up before anyone complains: I'm just talking about the 10 piece 10$ aliexpress mosfets, don't want to offend anyone

Hello Guys!

Due to recent events, I was wondering what your thoughts on chinese mosfets are.

In short summary: An IRFP460 from a normal source costs around 3€ (for me). The alternative are "IRFP460"s from china which you can get for 1€ each (10 for 10€).

The thing is that I have noticed that the chinese mosfets die alot more often and at lower loads (in contrast to the secifications). The same goes for my FGA60N65SMD, that died twice just today, which they shouldn't have. (halfbridge, 30V, 1A draw, 130kHz)

I just ordered real IGBTs and was wondering if these fake mosfets and igbts can be used for anything else or are those completly useless? At least I didn't lose too much money.

6
General chatting / Happy New Year!
« on: December 31, 2018, 11:55:04 PM »
Hi guys,

I joined this year hvf and it was great. There is a lot to learn and everything and I am really glad to be a part of this. I wish the best of luck to everyone and of course a Happy New Year!

 :)

7
Solid state Tesla coils / Car-Amplifier-SSTC QUESTION
« on: December 28, 2018, 11:02:30 AM »
Hi Guys!

I'm currently working on my first SSTC. Right now, I'm trying to get the electronics running, before putting it in the nice case.

My goals are:
>to get sparks (obviously)
>to use as many of the parts found in the car-amp
>to have everything fitting in a car-amp case

I found this old car-amp with 2x 80W channels for 5€ (something like ebay, but local)


Current performance 4-5cm arc at 30V and 0.2-3A.

PS: The 12V rail of the driver board had 2V ripple with ~300kHz, with 680uF added 0.5V ripple. Could this be a problem too?

8
Solid state Tesla coils / Choke-Core as GDT?
« on: December 22, 2018, 10:07:29 PM »
Hi there!

This is my first real attempt at making a tesla coil. I already built a sgtc back in school when i was ~16, but now I wanted to build a sstc.


Now my question: Can you use a choke-core (mine is from a microwave) for a gdt?

As fas as the internet is concerned the answer is no, but i tried it, and my waveform looks like "The perfect gate drive waveform!", according to this website: http://www.richieburnett.co.uk/temp/gdt/gdt2.html
In attachment 2 you can see my gdt and it totally looks like a iron powder core. What are your thought on this. Are these all lies surrounding iron powder cores? What should I have expected?
The risetime from the bottom to the top is 200ns... Does the mean I'm gucci?

Waveform with one IRPF450's gate connected

My setup for now

My driver (the gerberfiles are at https://highvoltageforum.net/index.php?board=4.0 ;) )

9
Printed Circuit Board / SSTC-Driver PCB 1.3
« on: December 02, 2018, 10:25:23 PM »
Hi guys!

I took my design 1.2 and made some changes to it. The biggest one is that i made it fit on a motherboard chipset heatsink for some possible cooling. The rest stayed mostly the same. If you have any questions please just ask.

 
Pinout is: [antenna] [12V] [Int] [GND] [12V]


* PLL-SSTC-Driver Rev 1.2.pdf

Ps: I still didn't test the design. There may be errors. You can check and make changes to it yourself, if you have KiCad. Just ask for the Projectfiles

10
Printed Circuit Board / SSTC-Interrupter Audio + PWM PCB Rev 1.0
« on: November 04, 2018, 04:14:58 PM »
Hi Guys!

As I already said in another post, I worked on a SSTC-Interrupter PCB. Same rules as before. It's not my schematic. If you want to know more about the schematic visit: http://kaizerpowerelectronics.dk/tesla-coils/musical-sstcdrsstc-interrupter/

Waring: It could contain errors so better check the circuit for yourself

Edit: Guess what, there is an error, the holes for the resistors are not long enough. It should still be functional, just ugly.

PCB:


Documentation:
* SSTC-Interrupter Audio PWM.pdf

11
Printed Circuit Board / SSTC-Driver PCB 1.2
« on: October 30, 2018, 08:16:30 AM »
Hi guys!

I have been working on a PCB template for the standard cd4046 sstc driver you find all over the internet (original by scopeboy.com/Steve Conner). I didn't design any of this, I just added a second pair for each UCC, inorder to drive these bigger GDT's too, without breaking a sweat. You can just use two instead of four UCC's but I went more indept in my documentation. If you want to know something, just let me know.

Now here's the deal. I am willing to share the gerberfile and the component list with you, to use for your project's. But there are a few points I want to clarify:
  • I don't want anyone making money on this.
  • It is not finished and I still update the files.
  • I haven't tested this design yet.


* PLL-SSTC-Driver Rev 1.2.pdf

For anyone interested: I am also working on an interrupter board with staccato interrupting. I will probably upload them later on too. If anyone sees any design flaws please let me know.


Pages: [1]

* Recent Topics and Posts

post Re: Unusual polarized non-electrolytic energy discharge capacitor
[Capacitor banks]
MRMILSTAR
Today at 05:19:51 AM
post Re: High voltage Christmas ornaments
[Light, lasers and optics]
klugesmith
Today at 04:57:27 AM
post Re: Unusual polarized non-electrolytic energy discharge capacitor
[Capacitor banks]
T3sl4co1l
Today at 04:04:35 AM
post Re: High voltage Christmas ornaments
[Light, lasers and optics]
John123
Today at 03:29:26 AM
post Re: Mineral oil breakdown voltage
[Voltage Multipliers]
klugesmith
Today at 01:14:06 AM
post High voltage Christmas ornaments
[Light, lasers and optics]
klugesmith
Today at 12:03:49 AM
post Small 65Kv X Ray Transformer hosuing build
[Transformer (iron core)]
DashApple
December 14, 2019, 10:52:49 PM
post Re: Mineral oil breakdown voltage
[Voltage Multipliers]
johnf
December 14, 2019, 09:23:27 PM
post Re: Mineral oil breakdown voltage
[Voltage Multipliers]
MRMILSTAR
December 14, 2019, 09:12:47 PM
post Re: Mineral oil breakdown voltage
[Voltage Multipliers]
johnf
December 14, 2019, 09:07:42 PM
post Re: Unusual polarized non-electrolytic energy discharge capacitor
[Capacitor banks]
MRMILSTAR
December 14, 2019, 09:04:49 PM
post Re: Mineral oil breakdown voltage
[Voltage Multipliers]
MRMILSTAR
December 14, 2019, 08:32:36 PM
post Re: Unusual polarized non-electrolytic energy discharge capacitor
[Capacitor banks]
klugesmith
December 14, 2019, 07:01:18 PM
post Re: Mineral oil breakdown voltage
[Voltage Multipliers]
klugesmith
December 14, 2019, 06:21:27 PM
post Mineral oil breakdown voltage
[Voltage Multipliers]
MRMILSTAR
December 14, 2019, 05:00:39 PM
post Re: QCW ramp generator
[Dual Resonant Solid State Tesla coils]
hammertone
December 14, 2019, 03:05:48 PM
post Re: Unusual polarized non-electrolytic energy discharge capacitor
[Capacitor banks]
T3sl4co1l
December 14, 2019, 05:45:54 AM
post Re: Modern go-to switching devices
[Beginners]
T3sl4co1l
December 14, 2019, 05:37:17 AM
post Re: SGTC MK1 - An Accomplishment in Progress
[Spark gap Tesla coils]
davekni
December 14, 2019, 05:26:41 AM
post Re: Modern go-to switching devices
[Beginners]
klugesmith
December 14, 2019, 04:54:15 AM
post Re: Duty cycle when driving a CRT TV flyback transformer
[Transformer (ferrite core)]
John123
December 14, 2019, 02:30:40 AM
post Re: Duty cycle when driving a CRT TV flyback transformer
[Transformer (ferrite core)]
jturnerkc
December 14, 2019, 02:21:19 AM
post Re: Aethra CCD Webcam Teardown - From Back When Streaming Was Expensive!
[Electronic circuits]
John123
December 14, 2019, 02:14:48 AM
post Modern go-to switching devices
[Beginners]
John123
December 14, 2019, 01:54:55 AM
post Re: Duty cycle when driving a CRT TV flyback transformer
[Transformer (ferrite core)]
John123
December 14, 2019, 01:37:03 AM
post Re: SGTC MK1 - An Accomplishment in Progress
[Spark gap Tesla coils]
jturnerkc
December 14, 2019, 12:57:15 AM
post Re: SGTC MK1 - An Accomplishment in Progress
[Spark gap Tesla coils]
MRMILSTAR
December 13, 2019, 11:48:12 PM
post Re: SGTC MK1 - An Accomplishment in Progress
[Spark gap Tesla coils]
jturnerkc
December 13, 2019, 11:19:27 PM
post Re: SGTC MK1 - An Accomplishment in Progress
[Spark gap Tesla coils]
John123
December 13, 2019, 11:00:18 PM
post Re: SGTC MK1 - An Accomplishment in Progress
[Spark gap Tesla coils]
jturnerkc
December 13, 2019, 10:50:03 PM
post Re: Unusual polarized non-electrolytic energy discharge capacitor
[Capacitor banks]
MRMILSTAR
December 13, 2019, 10:46:20 PM
post Re: Unusual polarized non-electrolytic energy discharge capacitor
[Capacitor banks]
klugesmith
December 13, 2019, 10:31:03 PM
post Re: Unusual polarized non-electrolytic energy discharge capacitor
[Capacitor banks]
AndreiRS
December 13, 2019, 10:00:04 PM
post Re: SGTC MK1 - An Accomplishment in Progress
[Spark gap Tesla coils]
John123
December 13, 2019, 09:08:28 PM
post Unusual polarized non-electrolytic energy discharge capacitor
[Capacitor banks]
MRMILSTAR
December 13, 2019, 09:06:47 PM
post Re: SGTC MK1 - An Accomplishment in Progress
[Spark gap Tesla coils]
MRMILSTAR
December 13, 2019, 08:56:27 PM
post Re: SGTC MK1 - An Accomplishment in Progress
[Spark gap Tesla coils]
jturnerkc
December 13, 2019, 05:05:55 PM
post Re: How do you keep in contact with forum people...?
[General chatting]
Mads Barnkob
December 13, 2019, 09:31:58 AM
post Re: My first DRSSTC on bricks
[Dual Resonant Solid State Tesla coils]
johnf
December 13, 2019, 07:56:39 AM
post Re: Royer oscillator (ZVS) driven Jacob's ladder, E80 core transformer
[Transformer (ferrite core)]
AndreiRS
December 13, 2019, 03:59:49 AM
post How do you keep in contact with forum people...?
[General chatting]
AndreiRS
December 13, 2019, 03:23:31 AM
post Re: Duty cycle when driving a CRT TV flyback transformer
[Transformer (ferrite core)]
klugesmith
December 13, 2019, 12:16:53 AM
post Re: My first DRSSTC on bricks
[Dual Resonant Solid State Tesla coils]
Laci
December 12, 2019, 08:35:24 PM
post Re: How To Make a Stencil For Spray Paint With Cheap Hand Tools
[General chatting]
johnf
December 12, 2019, 07:53:35 PM
post Re: Duty cycle when driving a CRT TV flyback transformer
[Transformer (ferrite core)]
John123
December 12, 2019, 02:52:58 PM
post Re: Royer oscillator (ZVS) driven Jacob's ladder, E80 core transformer
[Transformer (ferrite core)]
John123
December 12, 2019, 02:42:19 PM
post Re: Full bridge much "weaker" than half bridge?
[Solid state Tesla coils]
nick
December 12, 2019, 11:17:36 AM
post Re: Royer oscillator (ZVS) driven Jacob's ladder, E80 core transformer
[Transformer (ferrite core)]
davekni
December 12, 2019, 04:51:08 AM
post Re: Duty cycle when driving a CRT TV flyback transformer
[Transformer (ferrite core)]
davekni
December 12, 2019, 04:26:22 AM
post Re: How To Make a Stencil For Spray Paint With Cheap Hand Tools
[General chatting]
AndreiRS
December 12, 2019, 01:21:35 AM