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Messages - TMaxElectronics

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1
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: DRSSTC Questions
« on: March 11, 2024, 12:50:34 PM »
Quote
Can it sustain that? Does it not cook the coil running at 20kW?

The issue is the power input. That can't really handle 20kw constantly. Running the coil at a slightly lower power level (10kw or so) is perfectly fine in terms of thermals though. I've also run the coil at low power (2-3kw) without the fan on for a few minutes without the temperature going crazy. So it seems to be decently efficient.

2
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: DRSSTC Questions
« on: March 11, 2024, 12:37:52 AM »
You might be interested in the small coil project I've been working at: https://highvoltageforum.net/index.php?topic=2394.0
I'm in the process of open sourcing it too, including the mechanical design.

It uses a standard flat primary without a high coupling coefficient but still gets 60" sparks from a 12" secondary (total coil height is around 24") at 1ms ontime (as you can see here: https://www.youtube.com/shorts/LmHMwYoh9tM). The biggest issue that I've been having with the current setup is primary strikes (no doubt due to the flat primary ;) ) which are so energetic that they ionize the air in the space between the strikerail and the outer most winding and start an arc there too. I'm currently working on reducing the footprint of the secondary as well as adding a current ramp to the UD3 even in normal drsstc mode which apparently helps with starting the arc at the breakout instead of at some random location around the topload (both things that the at least the thundermouse already has).

3
Oh hey what a surprise, the project isn't actually dead or finished :D

I've been thinking about a collapsable topload design for a while now but not come up with anything great yet. Has anybody perhaps already built something like that before? I'm just constantly annoyed when having to carry around that tube-toroid that gets dented when you just look at it to strongly. A full sceletal one would of course be a nice alternative but transporting that is really almost as inconvenient as the current one :D

And probably the bigger news: I've started the process of documenting and open sourcing this entire project, so others can copy it if they want to. So far I've only gotten the three main PCBs (plus of course the UD3) ready for publishing but the rest is still to come :)
I'll also be including some short build instructions along with it. Perhaps not enough for someone to build this as their first coil but certainly enough for some experienced person to do so.
Here's the repo: https://github.com/TMaxElectronics/Mini-Coil/

4
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Next Gen DRSSTC
« on: February 24, 2024, 02:43:08 AM »
Interesting ideas, some of which I have actually at least played around with in the past.
I have a little ferrite core HV source that runs from a UD3 just using pulse width modulation. Pretty much just like you said: you could use the the pw slider in teslaterm to control the output power. I've also used the UD3 as a induction heater on a few occasions (once inadvertandly by having a hammer next to my big coil during testing... that then burned my hand :P).

The problem that I have with implementing that as a permanent feature is that there are some medium to large hardware changes required (especially for ferrite core mode) that aren't easy to do on the fly in the psoc. At least i don't know how :D Just placing different hardware next to the existing one and not enabling it until needed is unfortunately not an option as some types of the psoc hardware are already 100% used. I suppose the induction heater thing might work, but we'd really need to plan a proper mode switch in for that. Not just set the max. dutycycle to 100% :P

The idea of operation without a computer is nice and is actually partially implemented. The autostart option makes the coil behave exactly like a UD2.x or older coil with an interrupter input. But connecting anything to the UD3 directly (as in: without fiberoptic isolation) is not that good of an idea. We've already killed a few PSOCs just with crap coupled in through WS2812 LED strips ::)

But in the end it is an open source project: if somebody has an idea they can get the code and play around with it themselves, and if it works out well contribute back to the main codebase :)

5
General Chat / Re: Lathe Restauration
« on: February 19, 2024, 12:47:27 AM »
Yay part 2 (the headstock restauration) is up! :)


Quote
Have you browsed various social medias for groups of old machinists playing with olds lathes?
I have asked around on some german machinist forums, but people didn't seem to know much about that lathe there. There are actually a couple of posts of other people asking about info for their model EE, so perhaps I at least helped those :D

Looking at those pictures it actually seems like there were a few different versions of it, all with small differences in each casting (like for example the bearing mounts). Since I now know that the machine was delivered to an aero engine company in 1942 (at that time a division of heinkel... of course it had to be something to do with ww2 ::) ) out of a set of only 10 i assume that they might have well made small improvements to each set of castings.

6
General Chat / Lathe Restauration
« on: January 20, 2024, 08:52:23 PM »
I'm currently in the process of restoring my old lathe and decoded to turn it into a video series :)

I just uploaded the first part (the introduction) and will be uploading the next ones in the following weeks. Here's the link incase somebody is interested :)

7
Quote
Why not make the insulating sheets significantly oversized so this isn't a possibility?
Well... laziness xD Didn't want to use two pieces of the insulator sheet I cut the smaller sections out of so I just cut it in half, that ended up being exactly that width.

Quote
I always thought thermal paste were non conductive.
I'm using arctic mx4. I've used various types of CPU/PC type compounds and so far only come across conductive ones actually. Arctic MX2 is definitely confirmed to be conductive, that also already killed a circuit for me.
Interestingly enough the compounds aren't a dead short or even just a high resistance. The failure of one of my LED drivers (the one with MX2 in it) happened after quite a while and there the thermal paste directly contacted multiple exposed traces. Only after running for a while did the HV side short to a logic level track and kill the controller. Perhaps the conductive particles inside don't always make enough contact to conduct?

Oh I just remembered seeing ads for non conductive thermal compound? I think its designed for use in GPUs where you really have to use an excess of paste.

Quote
In my case, whichever IGBT of a paralleled pair failed first, other die was likely so hot it was on the verge of failing too.
I think I will end up replacing that one anyway though, as it would have potentially seen some quite high voltages on the gate. After all the gates both used the same winding on the GDT so during the transient there was effectively just a 20 Ohm resistor in series with the HV on the other gate. Guess the TVS diode caught that but I wouldn't bet anything on the IGBT not having died a little ^^ Better not risk it dying later and taking the new replacement IGBTs with it.

8
Dual Resonant Solid State Tesla coils (DRSSTC) / Interesting IGBT failure
« on: September 29, 2023, 10:56:54 AM »
It seems that my bad luck with IGBTs struck again, but not in the way you might expect :)

I was testing the small coil (https://highvoltageforum.net/index.php?topic=2394) when suddenly there was a pop and the breaker tripped. Power was only around 10kw so not fill tilt, but I was running from rectified three phase turned down on my variac to ~280V on the bus. After taking apart the coil I was surprised to see none of the IGBTs blown apart and no shrapnel anywhere in the case. Although three Transistors definitely died and shorted out.

With a bit of searching I finally found what made the pop noise:


So from what I can tell this is what happened:
When installing the IGBTs I accidentally mis-aligned the insulator sheet by perhaps a millimeter to the left. Certainly not enough to cause any immediate problems with shorting out. I then put a little too much thermal compound underneath the IGBT and some squeezed out by the side a little, but once again not enough to immediately cause trouble. The first few coil runs never ran at more than a few kw continuously (that 20kw run I posted lasted maybe 3sec before the breaker tripped?) so the IGBTs never really had time to warm up.

During the last run however I had much more power to play with because of the three phase supply, so I ran the coil at those 10 or so kw for quite a few minutes. The now hot thermal compound must have gotten a bit softer and dripped towards the heatsink.
Finally, the (slightly conductive!) thermal compound bridged between the non isolated heat spreader and the earthed heatsink. The plasma that formed expanded enough to touch the gate of the adjacent IGBT killing it. You can actually see a small shiny spot on the gate pin on the second IGBT from the right. That of course also killed the two IGBTs on the low side of the bridge when those switched on. Interestingly enough the parallel IGBT did not suffer damage (at least its not shorted), probably because the adjacent one dying made it take all of the current.

So remember to not use too much thermal paste everybody ;)

9
Sell / Buy / Trade / Re: UD3.1b pcb pre-orders open now
« on: September 26, 2023, 01:41:46 PM »
Update time again :)

The UD3.1c boards and the fibernets have arrived and I'll be shipping them out next week. I now have some in stock so any future orders will be processed immediately, but they are no longer in the preorder sale :)

10
Quote
Impressive performance for this small coil!
Thanks :)

Quote
Transient thermal impedance is more likely limiting factor, especially with 1ms on times.
I agree, I'd need to do the maths again but I did test it at a very low repition rate (5Hz or so) at up to 2ms with no problems. Apart from the power consumption again lol, the 2ms test at 400A ocd made the analog gauge of my variac jump to 10A every pulse despite them being so far apart.

I'm now kind of thinking about going to yet another resonantor design. One that has a much higher fRes and then going qcw. I think the bridge should be able to handle it jsut fine 8)

11
Ok so I just tested the new secondary. Wire diameter is now 0.3mm, which pushes fRes up to 215kHz which is a little far but I'm probably going to make a slightly fatter topload. Currently I'm just using one I made ages ago for what was to be a "crazy powerful coil". I guess that statement kinda evolved a bit :P
The secondary still gets very hot however... I'll get to that later ;)

I've also upgraded the IGBTs to the highest current ones I found for a price I was willing to pay: FGH75T65SQD
The datasheet output characteristic plot only goes to 300A, but especially at 19V on the gate it seems like they can handle MUCH more. Even at 175° and 300A per IGBT I'd say desaturation isn't a problem.

When re-tuning the coil I went for absolute lowest possible fres that would still give me a streamer, and coupling is at around 0.12 now (according to javatc).

There is now another problem though... the power source ;D
I haven't gone past 400A ocd yet (~500A peak) still at 1ms ontime and 15% maximum dutycycle (short term max is 23%) and the coil already draws 15-20kw. That is from a single phase 230V supply that is rated at only 16A. Peak current my clampmeter showed was 117,6A. I honestly think the coil would do 2m streamers if I had a ceiling high enough and more power. Thats also why the secondary gets hot again  :P

This vid has the catcher rod 1.5m away from the breakout:

Not a valid youtube URL Hmm embed doesn't seem to work... here's the link: https://youtube.com/shorts/LmHMwYoh9tM

The sudden end is from the breaker tripping (and no, not because I killed any IGBTs this time ;) )

Guess I'll have to upgrade to three phases next. Although that is going to be pretty annoying with only 650V IGBTs (rectified mains is up to 600V here).

12
Sell / Buy / Trade / Re: UD3.1b pcb pre-orders open now
« on: September 05, 2023, 12:04:45 AM »
Quick update: I've shipped the first batch of UD3s and am now starting round 2 of pre-orders. This will be for the UD3.1c version with the builtin 5V regulator too, so one less component to solder ;)
Shipping estimate is around end of September for those.

The fibernets had a problem with the PCBs in rev A which means I won't ship out the PCBs I have now, but the fixed revision will be included in the next order. So if you want one they will be shipped together with the next batch of UD3's :D

13
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Next Gen DRSSTC
« on: September 02, 2023, 08:37:27 PM »
I made some more small additions to the UD3.1.

First of all I added a resistor to the IBus input filter to add a voltage divider to that input. This now allows using Voltage mode current sensors, that output more than 5V. I also added a solder jumper that means one no longer needs to de-solder the smd shunt for use with the voltage mode sensors.


I also removed the little 5V regulator daughter board and replaced that with a smd 5V regulator. That way you don't need to solder that anymore and it will come pre-assembled when using the SMD assembly service. It is a little bit more expensive, but I think it's worth the reduction in soldering effort.

I might also just remove the position for the vdrive THT trim-pot, as the digiPot is working very well and I doubt the trimmer would ever be used. This will free up the space necessary to fit the 5V regulator :)

I'll be releasing that version as the UD3.1c once I verified the changes. The next batch of UD3's in my shop will be that version.

14
The box unselecting itself is intentional,. But what exactly do you mean with "nothing changes"? The effect depends on the SID you are trying to play, some don't actually use the effect at all. It could also depend on the settings you have selected for your coil (ontime, dutycycle etc.). The setting also doesn't exist in midi mode, as hypervoice is controlled by VMS there.

15
I make mine from spare copper busbar. Just cut off two pieces (around 25mm / 1 inch, could be shorter) and drill a hole through both at one end. Then put a thread into one of the holes with a tap, and drill out the hole on the other piece to allow the scre to slide through. Finally you screw the two pieces together with that screw and drill a hole sideways inbeteeen them that is the diameter of your pipe.

That makes a clamp that you can attach a wire lug onto and clamp down to the primary pretty nicely. Lasts forever too. Just be careful with the spacing to the next turn and your secondary, mine is certainly pushing it in terms of clearance and a sharp edge.



If you find that the clamp doesn't clamp too well then you could either try using a slightly smaller drill (although even 0.5mm less than the pipe diameter will look bad), or put a few sheets of paper inbetween those pieces before you screw them together for drilling the sideways hole.


16
Quote
That could be contributing to delamination when it gets hot
Absolutely, although another big issue is the epoxy not even getting to the pipe's surface... with the thin wires it just doesn't seem to pull itself inbetween the windings as it did with my large coil.

Quote
I'm guessing performance would be better with a higher primary impedance, perhaps 2x or at least 1.5x (30-40nF and corresponding higher primary inductance). 
I do use two parallel 30nF resonant caps, so for experimentation I could just remove one of those :D
The current primary is as big as I can get it in the footprint that I am targeting. I might have to go to a double helix primary in the future, which would certainly be interesting to try too.
But for now I'll stick with the primary I have and work on a new secondary and topload first :)

17
Quote
To summ it up briefly, turn on and turn off times are longer than in the datasheet
tbh that is the case with almost every IGBT that I have seen so far. Even original new out of box parts. The companies always polish the measurements to such a degree that I personally always measure the switching times instead of beleiving the datasheet. Not sure which exact IGBTs you have, but I have some SKM200 bricks that claim something ridiculous like 50ns fall time. With some of my other bricks even claiming 12ns fall time... So just because the rise and fall times don't match the datasheet doesn't necessarily proove fake IGBTs :D

Did you open one of them up? Its pretty easy to do, and if you're careful with the gate wiring you won't break the bricks either (although re-assembly could be a pain)

18
Quote
Do you know with reasonable certainty the secondary coil form material?
I doubt that is the issue, the pipe is polypropylene ;)
Outside is epoxy coated, but only very thinly, so not sure if that could be the cause. I measured the thermal impedance to ambient air at around 0.9°C/W, which means a total power output of over 70W to reach the 90°+ that it did during the test run.

Air cooling is an interesting idea, although I'd be concerned with potential contamination of the inside of the pipe. I've had internal arcing issues with my coils in the past from simply not wiping the inside of the pipe down before winding the coil. A fan blowing (dusty) air through it might deposit enough to cause problems again. Perhaps its time to finally build a freon-submersion cool secondary coil ;)

I think I'll want to reduce the power dissipation by at least half, which would require 0.3mm wire if 100% of the losses were resistive. The entire wire is also still within the skin depth, so the size increase should make a significant difference in the power dissipated.

Quote
Thermal camera would likely be more accurate for IGBT case temperature than lug-mounted thermistor.
True, but since I can't run the coil in its disassembled state easily this should be enough for me :)

Quote
How are you getting 270-290A with OCD set to 165A?  Does current rise that much in one cycle?
yes, and that is despite the reduced resonant cap size. Matches up with the calculated amount though :)

Quote
Impressive mechanical construction!  Much better than anything I'm capable of :)
Thank you :D

19
Oh hey, I just realised I totally forgot to update this log...

EDIT: I will be releasing the design files (pcbs, cad drawings etc.) to my github at some point in the future. I'll post about that here once I did. I also have some spare pcbs around, so if somebody wants to build one just send me a message)

Here's the current state of things:

I'm now on the second iteration of the pcbs in the coil, and they are working well now. The first had some stupid issues because I still keep forgetting to do a proper chekup on the schematic before starting board layout (so for example the precharge relay was connected to the precharge resistors with the nc contacts...).

I've also put in some work to fix the issues I had with the IGBTs blowing up as described in this thread here: https://highvoltageforum.net/index.php?topic=2502.0
I still need to search around for some bigger IGBTs as these already start desaturating at 150A, limiting maximum current to around 300A.
Although there is one good point to this: I have verified that the IGBTs are very easy to replace lol. Especially with the new revision of the boards, where you don't even need to unscrew the power board from the heatsink.

Another thing I have changed from the original design is the resonant capacitor. I initially planned to have a single 100nF dawncap/misc cheap aliexpress capacitor, but that turned out to not handle the current and also result in a resonant circuit with a very low impedance. At 350V VBus (rectified mains, with a bit of safety margin) the current would exceed the ocd threshold after just one and a half cycles. This resulted in peak currents far above the set pulse-skip threshold, further straining the IGBTs.
I now use two parallel 30nF caps, for a total 60nF resonant capacitance. Supposedly it can handle 120A now ::)

Here are a couple of pictures of the assembled coil:

All in all I'm very happy with the result, although the polycarbonate I'm using for the case is just so incredibly easy to scratch :-\

The secondary resonator is now 90mm pipe with 0.2mm wire and a 100mmx450mm toroid. This is the part I am least happy with though... Fres is around 150kHz, which is much lower than anticipated. I had to connect the primary at the absolute outermost point and  am still tuned slightly too high. No idea why javatc was off by such a large amount. That is probably also the reason fo the slightly disappointing performance. I'm also really starting to dislike the aluminium air-duct toploads... they are just sooo fragile and get dented pretty much from just looking at them the wrong way. I'll definitely be changing this over to one made from bent aluminium tubing in the future. I'll also hopefully make it disassemblable for easier transporting.
There is also one other problem with the secondary, but I'll get to that in the performance/thermal section of this post :)

Here are the parameters I settled on for now:
Ontime: 1ms (might go higher, it sounds just so awesome :D)
Primary current: ocd set at 165A, current peaks around 270-290A at 350V
Max dutycycle: 15% long term, midistick compressor set to limit to 25% short term (~500ms)

The coil makes around 0.8m long streamers, from a 0.3m long secondary. Not too bad but could certainly be much better with improved tuning once I fixed the secondary.

Thermals:
This is the point that I'm the happiest about. The entire power electronic section is still nowhere near its performance limit. For verification I glued one of the ntc's directly to the IGBT case, to at least give me somewhat of a better insight on the temperature of the transistors.

You can also see the aluminium plate heat-spreaders that I added for each pair of paralleled IGBTs to increase the surface area contact with the insulator sheet.
Here are the temps that the different parts of the coil got to after ~15min of playing music. Input Current was peaking at 20A from 230V with the average probably around 10-15A (so perhaps 2KW avg and 4KW peak, didn't measure the power-factor). Ambient temp was probably around 15-20°C

Heatsink: 30°C
IGBT tCase: 45°C (highest peak I saw) ~40°C avg
the following were measured with my thermal camera, so not that accurate:
Bus caps: ~ambient temp
Resonant caps: 30-40°C
Wires: 50°C
Primary: no idea, but not too hot to touch, so <60° :P
Secondary: 80°C+, waaay too hot to touch

So almost all good, except for the secondary... that got so hot that the wire separated from the pipe just from thermal expansion. Especially the the ends of the wire that went into the pipe were bad, as they even started slightly charring the pvc.
I think I'll definitely want to go to 0.25mm or even 0.3mm wire. That would also fix the issues I was having with the resonant frequency being too low.

And finally a bit of footage from the coil, including music after the static tones at the beginning :) (still uploading at the time of me writing this):

20
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Next Gen DRSSTC
« on: August 04, 2023, 07:17:33 PM »
Good news (no not the dacia sandero),

The Rev. B PCBs have arrived and are working well. I'll be shipping out the boards to those who pre-ordered during the next week or so (once I had the time to solder on the PSOCs).
I've also pushed the latest Gerber files to GitHub if you want to order the PCBs yourself.



The V2 of the fibernet that is JLC-Asssembly optimized still needs some work with sizing of the footprints, but is working well otherwise too. I'll be releasing the gerbers for that too, but you will have to hand solder the PIC aswell as the LAN9250 (the mac chip).

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post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
Alberto
March 23, 2024, 04:34:31 PM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
MRMILSTAR
March 23, 2024, 03:04:25 PM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
Alberto
March 23, 2024, 01:38:34 PM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
MRMILSTAR
March 23, 2024, 04:20:03 AM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General Chat]
davekni
March 23, 2024, 12:54:30 AM
post Re: Smoke Screen Machine Protect 950 XP - Teardown of a Smoke Cannon!
[Electronic Circuits]
davekni
March 23, 2024, 12:05:57 AM
post capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
Alberto
March 22, 2024, 11:45:03 PM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General Chat]
OmGigaTron
March 22, 2024, 11:30:09 PM
post Smoke Screen Machine Protect 950 XP - Teardown of a Smoke Cannon!
[Electronic Circuits]
Mads Barnkob
March 22, 2024, 10:20:35 PM
post Re: Where's all this voltage coming from?
[Spark Gap Tesla Coils (SGTC)]
Benbmw
March 22, 2024, 09:21:13 PM
post Re: What actually kills MOSFETs?
[Beginners]
AstRii
March 22, 2024, 03:37:11 PM
post What actually kills MOSFETs?
[Beginners]
FPS
March 22, 2024, 05:09:20 AM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 22, 2024, 03:57:54 AM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
March 22, 2024, 02:59:25 AM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 21, 2024, 06:31:42 PM
post Re: 2x Panasonic Inverter Microwaves - what to salvage, dangers?
[General Chat]
rikkitikkitavi
March 21, 2024, 03:08:01 PM
post Re: [WTS] IGBT, Ferrite, Capacitors, Tools, PSU, Industrial components and parts
[Sell / Buy / Trade]
Mads Barnkob
March 21, 2024, 01:37:32 PM
post Re: Difference between these transformers
[Transformer (Ferrite Core)]
Alberto
March 21, 2024, 11:42:07 AM
post Re: Phase Lead Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
March 21, 2024, 04:09:14 AM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 21, 2024, 02:15:31 AM
post My Homemade Structural Analysis X-Ray Machine
[X-ray]
Luca c.
March 21, 2024, 01:35:40 AM
post Re: Phase Lead Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Saattvik24
March 20, 2024, 10:40:00 PM
post Re: Difference between these transformers
[Transformer (Ferrite Core)]
Mads Barnkob
March 20, 2024, 08:03:41 PM
post Re: 2x Panasonic Inverter Microwaves - what to salvage, dangers?
[General Chat]
Mads Barnkob
March 20, 2024, 07:51:57 PM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
March 20, 2024, 10:39:47 AM
post Re: Phase Lead Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
March 20, 2024, 04:09:59 AM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 20, 2024, 01:13:23 AM
post Re: Phase Lead Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Keybored
March 20, 2024, 12:45:16 AM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
March 20, 2024, 12:30:30 AM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 19, 2024, 11:12:24 PM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Late
March 19, 2024, 09:47:49 PM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Late
March 19, 2024, 09:44:19 PM
post Phase Lead Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Saattvik24
March 19, 2024, 06:52:09 PM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
March 19, 2024, 05:02:44 PM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General Chat]
Mads Barnkob
March 19, 2024, 05:01:41 PM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
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?
[General Chat]
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?
[General Chat]
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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