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Topics - 304er

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1
Hi all,

Just would like to share an old school capacitor that my father, brother and me made in the early 1980's that was used on our SGTC also originally built then, which has recently been resurrected as a new/old coil as seen on my thread on Mains Staccato SGTC.

This old capacitor is retired now. Not good any more. I mentioned in the other thread it was quite lossy then. It had corona in constant fingers the whole perimeter on outside edges of metal plates on both sides. Ozone smell from this was quite great. This corona was typically about 3/4" to 1" long... basically a constant purplish growing frame all around plate edges. While this looked cool... hurt coil performance of course. It did work for quite awhile this way. But over time these fingers were actually etching the glass...this was then becoming more conductive...then it reached a breaking point...it started to jump all the way around the glass edges to other metal plate. This itself left arc etching... so it eventually started just popping all the time shorting the capacitor in loud bright white light arc pops...and really killing coil performance. You can see these etches burned in the glass in these pictures.

A few pictures of this fella:

https://photos.app.goo.gl/aUR9tnnWqnnEsKYT7

Just thought I'd share this for those possibly interested in seeing one...from someone who used one in the past...


Chris Reeland
Ladd Illinois USA

2
Vacuum Tube Tesla Coils (VTTC) / Mains Staccato / T-200 VTTC
« on: October 24, 2021, 11:18:22 AM »
Hi all,

First off I want to reference this just posted thread:

Mains Staccato / SGTC

So after the success of this...

I again got to wondering on one of my VTTC's. Specifically my "new" old T-200 one. This coil also has origins in the 1980's also. This coil is normally run on just normal AC with a fairly heavy plate transformer(38 lbs). I have run this coil with my now modified German Staccato controller and a SSR switching the cathode like normal. Works great and everything nice and smooth running. Single shots and burst modes all work great. Now this coil does not get very good swords. The frequency is about 100kHz too high. This coil never originally back then had this in mind at all. But it does have interesting bushy sparks though.

So I have decided to try hooking up the SSR to the 120vac mains input on the plate transformer. Going to switch the primary of the transformer direct again. And pretty much as expected, this works great. SSR zero crossover working very well. Any controller changes are very smooth and very responsive. This coil puts out about a maximum 20" sparks at times.

I have a link to a few pictures of this setup and a video I took of this running this way:

https://photos.app.goo.gl/fMz5gAGDmjMpvq5P9

I want to say this my even seem to run even smoother than before.
Also the plate transformer runs now even cooler than before, since again not constantly energized. I have also run this coil many times now no problem this way. Some runs over 2 hours even.

I currently do not remember the idle current of this transformer, but it not much when I last checked. Now this transformer when the tube cathode was switched, it would get a little warm. Now running this way barely warm at all. Actually maybe a little surprised some here.

And a final note here, this way will not work for a level shifted supply.
I thought about this because of the charge capacitor will not charge up properly. Decided to do a slightly risky test just to be sure. I took the removed bigger old MOT with a level shifter that is now removed and not going to be used anymore on the 304 coil and test on this T-200.
As I thought this does not work well at all! Got some strange occasional small poor sparks. Did not run long for fear of hurting something.
Next I hooked this up for regular cathode switching and the coil would  now get 27" sparks maximum. But this is pushing this old coil very hard. Primary wire especially. It is not very big wire at all!!! Gets quite hot now.
Tube does fairly ok. And well since no fan on the MOT it heats up quite quickly like they normally do. Just wanted to do a quick test this way also, just to verify.

I put the plate transformer back on switching the primary again and let it run for over an hour. Still all working great.


Chris Reeland
Ladd Illinois USA

3
Spark Gap Tesla Coils (SGTC) / Mains Staccato / SGTC
« on: October 24, 2021, 09:44:10 AM »
Hi all,

I am going to start by referring to this just posted thread for related background info and the recent ideal I had to borrow my VTTC Staccato controller and again using a SSR.

See thread:
VTTC Staccato/Interrupter Controller modified so SSR is useable for LShPS

So a little background on this SGTC first:
This is just a simple standard SGTC that my father, my brother and me put together originally back in the early 1980's. It ran just okay back then for what we knew then. Originally also used a very large homemade single glass plate capacitor, which was very lossy. But it was cool seeing the corona losses surrounding the metal plate edges on the glass all around... quite the glow!!!
Not going to go in all details...but several years ago I dug this fella out from storage. After some mishaps..me and my Dad decided to "modernize" this fella to things known now. Decided to make a MMC bank using the favored CD poly caps.
Add a Terry-Filter. Got some .25" tungsten for a dual static spark gap. Upgraded to a 15 kv 60 ma NST from a 30 ma. Add a 12" toroid. Reused as much as I could original wood rings primary supports and use .25" copper tubing and some ceramic rounds supports, instead of the original heavy insulation wire it had and the wood rounds supports. "Borrowed" a parts bin for a spark gap cover and put on two large 120vac fans on to mostly help cool gap, get clean air in and maybe just help a little on quenching. 4" dia. secondary was unchanged. It is wound on a piece of house carpeting cardboard tube if I remember correctly. It was varnished inside and out, then wound and varnished again. It looked good still, so decided to use as is. So this coil is a mix of new and old.

The layout of the separate MMC is intentional and extra inductance from long leads was figured in some and other losses were accepted.
I want to be able to very easily break this down and nothing too heavy or awkward to handle when handling. This then very easily fits into my small little commuter car for easy transport.

So this was a just a little at a time project between several others.
Very recently got done finally and did the first relighting of this "new" old coil. It went very well right out the gate. Decent sparks and with just a little more tuning and tweeking even better output. Very happy with it for the transformer we are using. Actually this "blows away" the original performance of this coil in all the 1980's when we ran it last.

I will admit some it took some rethinking of things as tube coils are a bit of different beast and I mainly mess with them now and had to get my brain focused on this at times.

I want to also metion that this NST has GFCI. This GFCI is not potted in, which is unusual now. NST is of course in potting. GFCI could easily be removed and by-passed, but me and my Dad decided to leave in and try it as is first. Well for us it is working just fine, so we are guessing the Terry-Filter is possibly doing a good job. Since works fine with, we will leave in for now...

So basically this SGTC runs just like any other on straight normal AC.

Okay on to the intent of this tread.
I have been spoiled for the past several years on my VTTC's.
I enjoy the near unlimited run times with the various Staccatos depending on how you set and run these circuits of course.
On the SGTC anything past 2 minutes I started to get worried. 3- 4 minutes was probably longest I was probably comfortable to run max.
Mostly 1 -2 minutes was most common and let cool down for a while.
I will admit, kind of hard to keep track of at times on how long running.
Seems like always a worry factor here.
NST was a quite warm after these runs. I knew static spark gaps probably were hot too despite fans. I was not going to touch and find out. The MMC I was not really worried about. It was always cool still to touch.

I got thinking again about the fairly recent modification I did to a German kit Staccato controller for SSR cathode switching use on my 304 VTTC.

I thought about SSR's and their originally intended use switching on mains voltage. So I rigged up a spare SSR on a heatsink to switch the hot wire on the 120vac mains at the input of the NST. Going to switch the NST primary direct. I then plugged in my German Staccato circuit on the "clean" side of the big line filter we are using.

I am happy to report that this works wonderful. The SSR zero crossover detection is working very well. Response of Staccato controller changes are instant and smooth on any changes. Everything is staying cooler of course as expected. The video in the link is quite long to prove this. NST was just barely warm after 17 minutes, makes sense since transformer is not constantly energized. SSR on heatsink barely warm. I have done several runs over an hour each now. No problems. Just other night I did a almost a 2 hours run playing around. Still no problems.
Several interesting things can be done with the Staccato controller.
The PW is in most ways set the opposite of what a tube coil wants for the longest arcs and this makes sense of course as a SGTC wants several successive cycles to grow the discharges. It is interesting to change PW but then change the PRF. Certain interesting "sweet spots" I have found so far. So when I intentionally created these Staccato burst modes for the VTTC, I thought this should work on the SGTC and does wonderfully.
It is interesting to bring SGTC to just a single PW cycle and slowly bring up to maximum multiple cycles PW.

Hope this rambling makes some sense.
I will now let pictures and a pretty long video speak for themselves.
The sound is quite different at all the different settings. The microphone on the camera is actually "overwhelmed" and does not truly capture all the true sounds. There is a breakout point on the toroid on the trash can side. Trash can about 3ft away for strike target.

Further tuning and testing is still required on this coil and now I am starting to maybe consider this Staccato as a possible factor. The Staccato can be a factor for tuning on a VTTC which I know very well.
I will have to see what happens eventually with more experimenting.

https://photos.app.goo.gl/sFgpX52MthRHH8X19

Chris Reeland
Ladd Illinois USA

4
Hi all,
Since I have been on the topic of SSR's, I want to share more here related to the original ideal I had when I first started using them on VTTC's. This is from 2 past posts on a mail list I did back in early 2020 and late 2020 if I remember correctly.

So here is copy and pasted both:

Hi all.
Gave a hint on this earlier, in a different thread.

Starting a couple of weeks ago, I started to think about some things, while I was converting my "breadboard" interrupter to put in a case, I am always thinking, even when working on other things...

I used to work as printer on newspaper printing presses for a lot years. Just left this industry for good a couple of years ago now. Dying trade. Besides running them, also worked on them. Lots of mechanical and electrical controls involved. In addition, used to work on all kinds of support equipment in mailroom department, which handles the papers after they come off the press. Again all kinds of mechanical and electrical controls.

I started to think about rotary encoders on lots of different equipment we had. Then, I thought about SSR's (Solid State Relays), again on several different things.
SSR's have been around for quite some time now.

I started to remember, some types of SSR's have a zero cross trigger method. And it does this on the actual load, vs. the indirect method of the other 2 interrupters that I have modified and use on my VTTC's. Trigger on the actual load should be even better, since especially using a level shifted supply.

This should work I thought. Then I thought about an encoder to use. The ones on machines there were used for feedback. I thought, about an encoder that was more convenient to use and thought about CNC machines that I have run before in the past. They have a rapid handwheel rotary encoder. The big plus is these have mechanical detent stops between the optical slots.

So with just a little looking around, I found some very economical ones, just in case it does not work, so I would not be out much coin if I fail.

When I got them in, I did a couple a very basic encoder output tests scoping it. Looked at the pulse width times and decided it is most likely going to work.
Just another note, the detent stop is actually not "centered". Designed that way. At first I thought this was going to be a problem, then I realized it will not. Because of not being centered, when you initially turn the handwheel, because of the detent, one direction you get a "quick pulse snap".
And the other you get a "longer pulse snap". Instantly, after looking at the pulse width duration on the scope, I thought "burst mode" in the long one. Cool! And a single shot in the short one. Can also achieve bursts by a quick flick of short ones, not quite as intense.

Decided, since I was pretty confident, to put all of this in an enclosure from the get go, before even trying actually on the coil. Normally I would not do this, I would admit.

I must say, it is working greater than expected.  Trigger timing is great. Long straight swords. No shorter wandering problems, like the EVR one originally had and even the former breadboard one had when using a level shifted supply. Really neat to be in full manual control. The things you can do are so numerous. A very fun controller. Get lucky once in a while right out the gate...

Since I was having so much fun, I have decided to give it a fun name, borrowing some from Greg Leyh's: Lighting On Demand big fellas coils :^)

So I will call it:
Swords On Demand

Just a few more thoughts here.
I suppose you could also use a regular encoder with a stepper motor and controller, or even fancier if you want, say a PLC or something else in conjunction with the SSR.

Also, I suppose using this SSR with  several other numerous devices to supply a "drive" signal to it.

For me for now, I like the extreme simplicity of this setup. Just 3 economical parts and very easy to hook up :^)

But I just today earlier, received a second SSR, to play with...

Going to attach several pictures, some info, a quick crude drawing of the wiring,  and a video of me running the coil with it.

Links:

https://photos.app.goo.gl/LDJkmHKtMqmHKg5f6

Video:

https://photos.app.goo.gl/pxrJmxy9MttT1EHz6

Chris Reeland
Ladd Illinois USA

Hi all,

I am resurrecting this post from much earlier this year since it is directly related to using SSR's and some related background info on my first try, which is near the bottom of this new posting.
As I hinted in one of my replies to Chip's question in his recent post: [TCML] Staccato Board, I am going to quote most of what I said again here:

"Anyways, I am pretty familiar with this circuit and others that are similar.
I have also modified this circuit a bit a while back. And another related one just a little. These are in my blue enclosures. I also have a very simple basic manual controller I put together a while back also.
Speaking of basic controllers, in the past few days off and on I have put together 2 more. Just bench tested right now. Will be doing VTTC running tests soon...to see if I failed or succeeded.
Anyways here is a picture of my collection of VTTC controllers.
https://photos.app.goo.gl/p9jpyod97xUi7UAi6
5 of them, with #6 in the works fairly soon I hope, which is based off the original design but some "layout" differences.
All of these controllers have zero crossing detection. Some different than others in how done.
I will be doing a new posting with pictures and maybe some video also eventually after doing some real running on coil with all 5 current controllers. Been a while since I have run the 304 VTTC so I want to run them all. Coil actually has a slightly damaged secondary currently, but still working ok with some losses...quite earlier this year I pushed it too hard, during extreme testing I did. Windings "buckled" in a few spots. Got too hot...the acrylic tube has warped some... Happens...not the first time :^) I will be fixing soon with some more ideas for major changes to this coil. I always seem to change this one around, testing/trying things.
Okay, enough rambling here...I will give more details eventually in a new post."

So picking up here now, I have run these 2 new controllers with success.
Going to call the new, very economical, encoder one: my "Mini" "Swords On Demand" controller :^)
I will let several pictures and a couple of videos speak for themselves. I make a few comments in the videos.
As can be seen in some pictures, I have removed the actual SSR from inside the original "SOD" enclosure and have now mounted on a piece on metal down low, to also help "shield" the circuitry inside it. This also allows me to share this SSR with several things. Can also easily switch back to my original tiny triac when using the "original" controllers which reside inside the blue enclosures.

I have also set some things up with some repurposed connectors I had laying around. They are arranged for ease of use and "genders" to avoid mistakes when switching between different controllers and different required "wall warts", to share components as much as possible.

I have also zoomed in pictures from much earlier this year of the current secondary coil damage. It is confirmed the secondary form is warped. I did not think/remember to take a picture of it when I removed the secondary to take a look inside of it to see why the windings "buckled". The epoxy coating can only do so much...

I will get around to repairing it. And I will also be completely changing the whole coil layout out. All major components the same. Just cleaned up and less cluttered and maybe well... "finalized" :^)

Link to pictures and 2 videos:

https://photos.app.goo.gl/FEBid6jNyapjDtoH8

Okay, as I like to say, "enough rambling".

Make some "Sparkeys" if you can...

Chris Reeland
Ladd Illinois USA


5
Hi all,

I am going to give some details on how to modify the common "classic" circuit out there, so a SSR (solid state relay) can be used for cathode switching when one is using the very common Level Shifted Power Supply usually with a MOT.
This circuit does not work as is for a SSR. I did try even though what I saw on scope I knew would not work, just to verify. Just the usual SCR or a triac works for switching the cathode ground.

First I will go over some things and details I have learned the past couple of years on interrupting VTTC's. Not going to cover everything, so here we go. Probably still be messy to explain though, sorry :-\

Going to copy and paste a portion of a private email exchange I had somewhat recently covering several things and this was one that is related and was on my 304 VTTC:

"BTW, I mentioned at the end of this video about switching to the regular triac I was also using at the time, a little while back, also to switch the cathode for comparison, but this video was never shot. In initial first testing of this new controller on a regular triac (before shooting some video of this) in comparing to the solid state relay I was just using here...it was initially working somewhat okay, but then a few late timing "nasty snaps" then killed my brand new, just the day before finished interrupter. Decided then, I am done destroying 555's and transistors in all my 555 type interrupters I have. Finally one time too many, when something goes too astray on this indirect method of zero crossover detection. I have now myself have done enough various tests, that it works much better sensing the real load using the SSR.
Last real run was when after I waited on some parts and then repaired this new interrupter and just of course used the SSR only and thoroughly tested and all was good, no video shot. Then shut down and start to dismantle for enclosure project."

Video link again:

https://photos.app.goo.gl/vokvkCZXPWmvCSWm9

So when I tried using the triac, this controller still detects zero crossover on normal mains AC sine wave. But the coil is using a level shifter supply.
Sine wave form is now different. So controller is actually switching late. "Hard" switching is occurring instead of staring at 0V. You also do not get full advantage of the "ramp" available now since switching late. Sometimes when you are changing especially the PRF (pulse repitition frequency) it doesn't do this smoothly and it will "hiccup" I call it, a really late firing...but passes and smooths out again at new rate. When you are unlucky it will sometimes cause a harsh "kickback" and since the gate of the SCR or triac is not really isolated...it will kill various components in your interrupter.

Now when you use a SRR in conjunction after being set up properly, the SSR will "correct" any late pulses by not firing at all, since it has true zero crossover detection on the actual load itself. And there is the benefit of optical isolation with our interrupter now also.

So this modification is really easy with an added benefit more control options for running the VTTC. When I looked at the waveform on the scope, when I was trying to figure best/easiest way to do this I looked at the threshold/discharge capacitor on the 555 for PW (pulse width)(Or the PW half if a 556). Immediately realized with just a little experimenting on this capacitor, that I could achieve 3 things if done right in conjunction with varying adjustment of the PW variable POT checking this.
1: I could cut out the coil from firing.
2: Adjust to fire a single pulse.
3: Obtain a large variable range of "bursts". (Successive pulses) (Another note here is an EVR Staccato controller does burst modes by adding another 555 to the circuit, but this is not really necessary I see now.)

I am going to attach several pictures of this modification I did to a somewhat fairly new German Staccato controller I put together earlier this year as an example that could also be done to other "classic" controllers.(I have already done this also to 2 other different ones I have and they work as well.)
This controller is marketed by this fella for SSTC use.
I came across this accidentally on eBay. Saw the board and it caught my eye. Recognized some things...then realized it is still basically the classic circuit but done differently and a few minor changes. I knew this would work for VTTC's. And the price is very reasonable for a kit.

I am not going to attach the complete manual or schematic. The seller sends a temporary, for an amount of time, a link to download after purchase and I will honor that.
I will just show what area I changed.

I want to metion here, that this classic based controller will work as is, if you are going to run your VTTC on just regular mains AC. It will work just fine. No ability to cut out most likely. And no bursts available though as is.

Pictures of population of board and putting in a custom enclosure after carefully locating holes. And gutting out an old GFCI plug housing to put the small  "AC trigger" transformer inside for a custom AC "wall wart". And the DC "wall wart" I found in my stuff around here. The DC one is not included in kit.

https://photos.app.goo.gl/3y35HPHsmQ1sHBdz9

Figuring out connections and scope the output. Does not look good for SSR when level shifted supply:

https://photos.app.goo.gl/BMtcDh7kM7J4J1Nh9

Took apart to make the simple modification and scope the results. Ah... perfect :^) for the SSR now:

https://photos.app.goo.gl/M9MR1WLdyoC53NNj9

This new minimum PW, the coil is cut out:

https://photos.app.goo.gl/DZSbAfT23FG7eKN18

This adjusted PW is about where the coil will now fire on the lever shifter supply. (SSR "ignores" majority of PW except just "last little bit" and fires at true zero crossover of level shifted supply.):

https://photos.app.goo.gl/vVJjNdywya4APC3H7

The new maximum PW with the now real long burst (Several successive cycles and adjustable any where in between:

https://photos.app.goo.gl/zz4k98pqSWmCCjuB8

Just a note here for the not possibly obvious for some...but all scope pictures are off of normal AC mains waveform. Checking how well it's own zero crossover is doing for proper and smooth function when changes made to PW and PRF.  The SSR will "correct" output to true crossover.
Just "visualize" shifting whole sine wave straight up to zero all positive for the lever shifter.

So as "long winded" as this is... actually very simple one capacitor change to do after figuring everything out and understanding the different behavior of the lever shifted supply wave form besides the well known voltage increase. Also there is another way I could have done all this too, but this way gives me the most desirable results.

Again see video link above and see successful SSR use.

Chris Reeland
Ladd Illinois USA

6
Vacuum Tube Tesla Coils (VTTC) / Finally finalizing my 304er VTTC
« on: April 24, 2021, 04:29:28 AM »
Hi all,

Fairly recently, I have decided it is finally time to get this finalized, inspired by others here :^) and will share this. This project will take some time and will update as I go. This is a single tube Eimac 304 and a single MOT with a level shifter with 120V input from a variac. This has been a great running little fella.

Some goals also so far are:

- To have this completely and very easily portable and light as possible.
- Very simple setup, just a single plug to any 120V outlet, to power everything. One slight exception is the accessory 120V cord plug coming out the unit to power my several different kinds of interrupters I have and the "trigger" wire connector from the interrupters. I do not want to be limited to one type built in.
- To have this coil be as high performance as possible, but very reasonable power draw. VTTC's can be horribly inefficient vs. arc length output.
- To take advantage of the heatsinking capabilities of the whole aluminum enclosure and use a single fan to help take this heat away cooling stuff on the way out. I want to be able to do VERY extended run times, with everything staying "happy".
- To take advantage of some of the shielding this enclosure should provide. It will be at ground potential. Everything thing iron/steel will be inside. This will also greatly simplify several connections.
- And of course, look great hopefully!
- Still thinking of others :^)

I will admit that I am torn some here on an enclosure, I normally prefer everything out in the open at times, but the advantages that I want outweigh the "open". I am planning to make sure that I can get the top cover off with the minimum of hassle to show off "under the hood".

Here is a link below to some pictures of it's current state after a quick run testing it before starting to taking it all apart and the new aluminum enclosure nearby.
Also a video taken oh... about a month ago...I did not take any video today, but nothing has changed, so this is how it runs with one of my interrupters now. Yardstick hanging in back as a reference.

There are going to be some changes here also... this is not a direct transfer of everything...so the hope is not to have less performance!
I will try not to mess things up with some ideals I have.

And well, this is also a repair project, as the secondary is slightly damaged for quite some time now. Down in the primary area the windings are buckled some. Got over heated some, during some extreme testing I did. The acrylic is now warped some. The epoxy coating can only do so much...
Kind of bummed to retire the coil form...been in use since about the early to mid 1980's. For those that don't know, this VTTC has changed quite a bit over the years especially the last 3-4 years from it's origins in the 80's. Several different tubes, transformers, variacs, capacitors, secondary rewound several times, primaries, etc. Somewhat surprised the secondary works pretty good still with damage, even if though not really much voltage in the windings here.
I will take some close up pictures when fully apart.

https://photos.app.goo.gl/CqugwKFGQjLn3pdb7

Oh...this is all I can think of currently...and I will think of more as I go and post. There will be some tests along the way and I will also give some numbers and specs.

Oh...a few numbers to start, the new/old surplus enclosure I found is 17"x17"x6". The old platform board is 20"x20". (Actually, this platform board is the second one for this coil. Original much smaller, ran out of room with changes. It has a lot of "bullet holes" as does this current board from several changes experimenting as seen in one picture of the underside.)

Make some Sparkys all if you can :^)

Chris Reeland
Ladd Illinois USA

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[Dual Resonant Solid State Tesla coils (DRSSTC)]
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March 26, 2024, 08:46:59 PM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
March 26, 2024, 05:02:18 PM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
March 26, 2024, 03:16:03 PM
post Re: CM400 Induction Heater
[Electronic Circuits]
Anders Mikkelsen
March 26, 2024, 01:41:49 PM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 26, 2024, 04:48:22 AM
post Re: Re-chargeable 1.5 volt lithium ion AAA batteries
[General Chat]
MRMILSTAR
March 26, 2024, 04:16:37 AM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
March 26, 2024, 04:16:24 AM
post Re: Smoke Screen Machine Protect 950 XP - Teardown of a Smoke Cannon!
[Electronic Circuits]
davekni
March 26, 2024, 04:13:02 AM
post Re: CM400 Induction Heater
[Electronic Circuits]
davekni
March 26, 2024, 04:00:43 AM
post Re: Re-chargeable 1.5 volt lithium ion AAA batteries
[General Chat]
davekni
March 26, 2024, 03:19:18 AM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
thedoc298
March 26, 2024, 01:50:42 AM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
March 25, 2024, 08:05:02 PM
post Re: Smoke Screen Machine Protect 950 XP - Teardown of a Smoke Cannon!
[Electronic Circuits]
Mads Barnkob
March 25, 2024, 07:41:29 PM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
March 25, 2024, 06:45:46 PM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
March 25, 2024, 05:44:25 PM
post Re: CM400 Induction Heater
[Electronic Circuits]
Anders Mikkelsen
March 25, 2024, 04:47:17 PM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
March 25, 2024, 04:27:22 PM
post Re-chargeable 1.5 volt lithium ion AAA batteries
[General Chat]
MRMILSTAR
March 25, 2024, 03:57:34 PM
post Re: CM400 Induction Heater
[Electronic Circuits]
markus
March 25, 2024, 02:06:41 PM
post Re: Odd MOSFET Driver Behavior
[Solid State Tesla Coils (SSTC)]
KrisPringle
March 25, 2024, 04:43:25 AM
post Re: Odd MOSFET Driver Behavior
[Solid State Tesla Coils (SSTC)]
davekni
March 25, 2024, 02:39:40 AM
post Re: Odd MOSFET Driver Behavior
[Solid State Tesla Coils (SSTC)]
KrisPringle
March 25, 2024, 12:47:09 AM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
Alberto
March 24, 2024, 07:36:32 PM
post Re: My completed 14-stage Cockroft-Walton voltage multiplier
[Voltage Multipliers]
Alberto
March 24, 2024, 07:27:24 PM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
MRMILSTAR
March 24, 2024, 04:25:23 AM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
Alberto
March 23, 2024, 10:47:35 PM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
MRMILSTAR
March 23, 2024, 09:30:21 PM
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

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