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Messages - johnnyzoo

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1
Light, Lasers and Optics / Re: HV glows in incandescent lamps
« on: April 10, 2023, 09:18:23 AM »
I think xenon is  too expensive to use in filament bulbs.  Usual fill in tungsten halogen lamps is argon plus iodine.  The iodine is what allows the lamp to run hotter, by binding to any evaporated tungsten then depositing it back on the hottest part of the filament, which is usually also the thinnest part.

Quote
I think xenon is  too expensive to use in filament bulbs.  Usual fill in tungsten halogen lamps is argon plus iodine.
Small flashlight bulbs used to be available with krypton fill for improved efficiency (lower thermal conductivity).  I don't know if halogen bulbs ever used krypton.

I have read that most halogen lamps have xenon as the bulk gas, but I'm not sure how reliable my sources were.

Some high performance incandescent flashlight bulbs were also advertised as "xenon" bulbs.

2
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Oversized QCW
« on: April 10, 2023, 09:10:03 AM »
Quote
I think its a large minor diameter on the toroid that is needed, to form a larger and stronger field, that can reject the spark from going sharply down-/inwards.
Hope to try that eventually.  Though you are accurate that my ceiling height is quite limiting.  Once I'm done experimenting, plan to package control electronics for a more portable unit.  Then outdoor testing becomes more practical.  Before that I plan to experiment with audio modulation, pulse-skip ramping, and phase-shift ramping.  (Comments on the forum suggest pulse-skipping ramp will not be smooth enough.  Probably true.  But I want to see for myself.  I'm not aware of anyone else actually testing pulse-skip.)  Phase-shift ramping will limit power and duration for my given IGBT H-bridge due to hard off switching increasing IGBT power dissipation.  However, I'm not sure the theoretical 120kW of this initial buck-converter version will actually be useful.  Definitely not useful in my constrained indoor setting.

Pulse skip modulation sounds like a very elegant solution as it preserves soft-switching and doesn't need many extra components. Not sure how hard it is to implement but it's something I might want to try if I were to build a Tesla coil now.

Looking forward to see your results. :o

3
Laboratories, Equipment and Tools / Re: Electrical resistance cooking
« on: November 09, 2022, 02:18:59 PM »
Heating a sausage by feeding current through it is quite a classic experiment, but I never thought that some company would actually make a commercial product out of it.  :o

On the other hand, there are all sorts of dodgy water heaters being sold in China, perhaps similar ideas were behind this product as well. (Danyk aka DiodeGoneWild has reviewed these on Youtube.)

Hm, the leaflet actually says 1977, this is older than I thought. Perhaps safety regulations were less strict back then?

Besides questionable electrical safety, electrolysis and arcing byproducts are some of the problems that came to my mind.  :o

4
Isn't it cool to have branches in those VTTC-style arcs? :o

Altering the ramp shapes and times sounds like an interesting target for experimenting. An endless number of different ramps can be tried but of course not all of them may be useful.

5
Electronic Circuits / Re: Failure analysis of a 120VAC LED light bulb
« on: October 16, 2022, 08:01:20 PM »
How long did that bulb last before failing? :o

I haven't used LED bulbs a lot, but I have a feeling that the LEDs are often not the first thing to fail in them.

6
Interesting project. :o

So... the signals come from the detector (?) of the electron microscope itself, into this photo unit? Did I understand it correctly?

Do you know if the original manufacturer sold any accessories that would produce a standard video signal?

If not, I would imagine that finding a plug and play solution is unlikely.

Conversion to standard analog video such as PAL or NTSC composite might be very complicated:
Basically, this would mean converting CRT drive signals into a standard video signal. CRT televisions and monitors do the opposite.
Something like this happens in an analog video camera, but using existing camera electronics for this would probably be difficult or impossible. I'm not familiar with this technology so I can't comment much.
Even if some camera electronics could be modified for this purpose, the analog conversion from whatever format this device uses (number of lines, scan rates, etc) into a standard format would be challenging.

So perhaps it would be easier to digitize the signals right away, and do the conversion in software. If you can get high speed DAQ equipment, you can record the signals using your computer and write software that turns them into digital images. I remember seeing some people using this approach to record the digital output of old CGA video cards. Analog capture has some additional challenges.

Modern high performance oscilloscopes might also have enough memory to capture a complete frame at once, so if have access to one, you may not need any additional capture hardware.

If you want a standalone converter, the next step might be using ADCs and a processor of some sort to do this without a computer, but it might be easier to try it on a computer first... unless you are already familiar with high speed AD conversion.

The signaling format must be sorted out. Voltage levels and ranges, number of lines, rate of frames per second and so on. I would assume that one of the deflection signals is sawtooth and the other is "stairs" but I'm not sure. I'm not very familiar with CRT technology so I don't know how the brightness/contrast signals work. Brightness = intensity level, contrast = ratio of high/low intensity levels?

Once you know how to safely digitize the signal, reverse engineering gets a bit easier. Be careful - the CRT uses high voltages and besides injuring yourself, you can fry sensitive electronics if you accidentally plug them into wrong place. Also be careful with correct reference potentials when you connect oscilloscope or data acquistion equipment.

edit: Rewrote my post, the original was written in a hurry.

7
Spark Gap Tesla Coils (SGTC) / Re: 60hz synchronous motor on 50hz?
« on: November 28, 2021, 10:05:40 PM »
A VFD is not useful for powering a synchronous motor for a SGTC synchronous rotary spark gap. Even if you manage to find a speed (frequency) setting that yields the exact desired RPM, the spark gap rotor electrodes rotated by the motor will very likely not be in proper phase alignment with the power line waveform voltage peaks when they fire. Even if you got lucky and managed to get it in-phase with the power line voltage peaks, the motor speed will slowly drift depending on the precision of the timing circuitry in the VFD thus eventually taking it out of proper phase alignment with the power line.

You actually need a synchronous motor or a normal induction motor modified to be a synchronous motor in order to remain phase-locked with the power line current. Either motor must be connected directly to the power line.

I agree, but as usual, I got some additional ideas... :o

Are there advanced motor/servo drives that can be controlled by giving an angle reference? If mains voltage (reduced via transformer and possibly processed somehow) were fed as a reference signal, such a drive would then synchronise the motor speed to the mains frequency. Some jitter might remain but maybe not too much.

Motor type would not matter but it must of course be compatible with the drive system. 

This would of course be rather complex, such drives are probably not common or cheap anyway and it would probably need an encoder for precise control.

Phasing the spark might not be a big problem as it must be checked mechanically anyway, even with true synchronous motors, right? Adjusting the angle reference electrically might actually be easier.

8
Beginners / Re: Safety concern
« on: November 17, 2021, 08:04:09 PM »
As far as I know, RF current through your body parts shouldn't cause heart malfunction or cramps like low-frequency AC or DC does. Some people say it can be almost painless (I haven't tried). You can find Youtube videos where people draw high frequency arcs using their fingers, which is obviously not recommended but it illustrates the properties of higher frequencies.

However, at higher power levels it will cause nasty burns, and I believe nerve damage is also possible in the long run, either due to burns or other effects.

Another danger may arise if the RF source is not galvanically isolated from the mains AC or DC supply.

Avoiding any contact with the energized parts is a good idea of course.


edit: Too slow, Twospoons was quicker with his reply. Mostly same things as what I wrote.

9
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Idea for QCW DRSSTC
« on: September 20, 2021, 09:24:10 PM »
Quote
Cycle skip modulation also mentioned by davekni sounds like the most elegant way to me, although I can imagine it might be somewhat challenging to implement too. That way you should be able to preserve soft-switching. That's what I might want to try if I were to build a Tesla coil now.
This thread discusses unsucessful attempts at pulse-skip QCW control:
https://highvoltageforum.net/index.php?topic=292.msg1862#msg1862

However, this link shows QCW coils modulated to play music:
https://highvoltageforum.net/index.php?topic=472.msg2879#msg2879

If sword sparks can be generated while modulating enough for music, it seems like pulse-skip modulation could be of the same order.  Perhaps the issue is near ramp beginning when most pulses are being skipped.  That is where I hope to experiment eventually.  Perhaps start with phase-shift initially, then use pulse-skip later in each ramp for efficiency.



Interesting threads, thanks.

There was a link to an old thread on 4hv.org (https://4hv.org/e107_plugins/forum/forum_viewtopic.php?p=2&id=128784) and if I understood correctly on my quick read, that particular coil was configured to turn the bridge off during a skipped cycle which recycles primary energy into the DC bus.

How about shorting the primary instead, has anyone tried that? It would allow the primary to oscillate freely, like a spark gap coil does, and the current would decay slower.
edit: Freewheeling is mentioned in the thread that you linked, so I suppose it has been tried too.


I was also mentioned by the builder that the frequency might have been too low for sword style arcs, but I guess other people have tried higher frequencies?

10
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Idea for QCW DRSSTC
« on: September 19, 2021, 11:09:37 PM »
Not a Tesla coil expert here so take this with a grain of salt, but just some thinking...

Buck converter seems like a "brute force" solution, bulky, plenty of extra components, but probably robust when done properly, and the design is somewhat straightforward.

Phase shifting the bridge is something I'm not at all familiar with so I can't comment on that. (It sounds confusing, I need to see some oscilloscope shots)

Frequency shifting sounds like it might be challenging to find a good frequency ramp as davekni said, but it's worth experimenting I guess.

Cycle skip modulation also mentioned by davekni sounds like the most elegant way to me, although I can imagine it might be somewhat challenging to implement too. That way you should be able to preserve soft-switching. That's what I might want to try if I were to build a Tesla coil now. :o

11
Voltage Multipliers / Re: Resistance to protect flybacks, etc.
« on: September 15, 2021, 08:20:53 PM »
A parallel resistor will provide a base load for the transformer. This may be beneficial or necessary with flyback/boost-type converters and certain resonant converters which may be damaged by overvoltage if operated without load.

A series resistor can be used to limit the output current. Whether this is necessary or useful depends entirely on the transformer/converter and the application.

Good resistance value also depends entirely on the transformer and the converter driving it. As for TV/CRT transformers, I can't immediately recommend any specific value, but a suitable parallel load resistor would probably be in the mega-ohm range or higher.


edit: I just noticed the subforum - are you asking about HV transformers in general, or cascade multipliers specifically? 

12
General Chat / Re: The Therac 25
« on: September 15, 2021, 08:09:01 PM »
How about some some concurrent programming assignment with an actual Therac-25? :o

http://web.mit.edu/6.033/2007/wwwdocs/assignments/handson-therac.html

13
I have seen low-voltage "brushless DC" fans slowing down or turning off due to RF field. Remember, they contain electronics, basically a mini inverter that runs the three-phase motor.

Capacitors, ferrites, chokes, foil, overvoltage clamping elements are all worth trying, and also connect the PWM signal as said above.

Some fans are less sensitive as you already found out. If all else fails, a fan with no electronics won't be affected much by the tesla coil fields.

14
Vacuum Tube Tesla Coils (VTTC) / Re: VTTC Arcs From Feedback Coil
« on: August 04, 2021, 11:03:33 AM »
With two tubes, a VTTC with a push-pull oscillator of some sort might be an interesting project too.

15
Voltage Multipliers / Re: Flyback secondary burnout
« on: August 03, 2021, 06:31:34 PM »
I've toasted a few old TV flybacks.  I read recently that they shouldn't be run with an open (infinite resistance) secondary because the voltage gets too high for the insulation.  Is this generally true?

One could put a short spark gap or a high voltage resistor across the secondary output.  The resistor might be preferable, except that it would be a drag on the output voltage all the time, not just when a spark gap was sparking.  What does anyone suggest?  If I used a HV resistor, roughly what resistance?  I have several 240k and up from there.

Another idea would be to use a MOT instead of a flyback. Maybe two MOTs could be run in series to get enough voltage?

Than, guys.

I'm not sure about TV/CRT transformers specifically, but in general, it is true that transformers operated in a flyback type of converter (1) or in certain resonant converters may be damaged if they are operated without load.

Which is better, spark gap or resistor, depends on your application. A resistor will dissipate some power all the time. A spark gap will only fire when the voltage gets high enough, but then it will appear almost like a short circuit.


Whether using microwave oven transformers is a good solution also depends on your application. Using them in series is not impossible but it requires great care. Note that the other end of the high voltage winding is usually connected to the transformer chassis. The frequency is low compared to flybacks (50 Hz vs some ... tens of kHz) and you will get around 2 kV from one microwave oven transformer. And perhaps most importantly, a microwave oven transformer can produce a deadly amount of current at a very dangerous frequency if you get a shock from it. TV/CRT flyback transformers are safer, although you should always avoid getting a shock. Maintain distance, use insulated stick, stands etc, and keep your work area clean.



1) Storing energy in the magnetic field and releasing it; TV transformers are operated this way in their normal application. Basic mechanical and transistor-based ignition coil circuits also work this way. But not all "flyback drivers" used by hobbyists operate in flyback mode - some of them may operate like ordinary transformers, others may be resonant.

16
Vacuum Tube Tesla Coils (VTTC) / Re: VTTC Arcs From Feedback Coil
« on: August 03, 2021, 06:16:50 PM »
I don't understand how one is red plating, I bought identical tubes from the same place. Imperfections I guess.

I'm not a tube expert, but:

I think tubes can have significant differences in their characteristics due to the nature of the manufacturing process. Even more so than semiconductors, although this also applies to semiconductors, to an extent.

Unless you buy a matched set of tubes - tubes that have been specifically selected from a larger batch based on their measured properties - you may have to balance them yourself. Matched sets typically cost more than individual tubes, and the more tubes you want to include in such a set, the more you have to pay for each tube.

17
Beginners / Re: Microwave Oven Capacitors Oil
« on: July 13, 2021, 09:48:48 PM »
I have also seen microwave oven capacitors that had "No PCB" on them.

Unless the capacitor is very old, it's unlikely that it would contain PCBs. PCBs have been banned in most countries for several decades.

Other than that, I don't know what exact types of fluid are used in capacitors. The Wikipedia article on transformer oil mentions capacitors as well, but I don't know how reliable it is, or if it's applicable to microwave oven capacitors.

Anyway, I would dispose of the leaking capacitor as soon as possible.

18
Unless I'm missing something, flyback converters are inherently "half-wave" due to how they operate (storing and releasing energy in the core magnetic field). So any TV/CRT transformer that is driven by a flyback converter must be half-wave rectified for proper operation.

19
General Chat / Re: Safe source for High Voltage Wire?
« on: May 17, 2021, 08:58:05 AM »
Car ignition cable is OK for moderately high voltages and low...moderate currents. Note that many ignition cables are made with carbon composite conductor which has relatively high resistance and you probably don't want to use such cable. Buy copper cable instead. It can be found in some car parts shops.

And as said above, trusting your life on cable insulation is usually not a good idea in these hobby projects. Many things can go wrong. Maintain distance and use a non-conductive stick for adjustments and drawing arcs. Make sure that the stick is really non-conductive.

20
I haven't seen many inductive coilgun designs on the internet. Most of them are disk launchers that have a single flat coil.

Multi-stage design should be possible and it might actually be easier than designing a traditional multi-stage reluctance coilgun. Worth trying definitely.

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March 19, 2024, 04:31:02 PM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
March 19, 2024, 03:59:54 PM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 19, 2024, 06:41:39 AM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General Chat]
davekni
March 19, 2024, 04:05:49 AM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General Chat]
OmGigaTron
March 18, 2024, 09:08:35 PM
post Re: Can I Trust This Super Cheap Site?
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2020-Man
March 18, 2024, 09:07:35 PM
post Re: Can I Trust This Super Cheap Site?
[General Chat]
Twospoons
March 18, 2024, 08:57:06 PM
post Re: Can I Trust This Super Cheap Site?
[General Chat]
MRMILSTAR
March 18, 2024, 03:51:33 PM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Late
March 18, 2024, 02:59:46 PM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Late
March 18, 2024, 02:33:25 PM
post Can I Trust This Super Cheap Site?
[General Chat]
2020-Man
March 18, 2024, 11:02:12 AM
post Re: Where's all this voltage coming from?
[Spark Gap Tesla Coils (SGTC)]
Twospoons
March 18, 2024, 02:36:11 AM
post Re: Best forum for vacuum tube amplifiers?
[General Chat]
Mads Barnkob
March 17, 2024, 07:42:55 PM
post Re: 2x Panasonic Inverter Microwaves - what to salvage, dangers?
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Michelle_
March 17, 2024, 04:15:14 PM
post Re: 2x Panasonic Inverter Microwaves - what to salvage, dangers?
[General Chat]
Michelle_
March 17, 2024, 05:05:04 AM
post Re: Where's all this voltage coming from?
[Spark Gap Tesla Coils (SGTC)]
davekni
March 17, 2024, 04:50:51 AM
post Re: 2x Panasonic Inverter Microwaves - what to salvage, dangers?
[General Chat]
Twospoons
March 17, 2024, 04:45:17 AM
post 2x Panasonic Inverter Microwaves - what to salvage, dangers?
[General Chat]
Michelle_
March 17, 2024, 04:17:51 AM
post Where's all this voltage coming from?
[Spark Gap Tesla Coils (SGTC)]
Terry
March 17, 2024, 01:29:32 AM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
March 17, 2024, 12:33:06 AM

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