Author Topic: Enamel on secondary breaking down?  (Read 2900 times)

Offline nzoomed

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Enamel on secondary breaking down?
« on: April 09, 2023, 02:53:56 AM »
I've noticed some discoloration on the wire and not sure if it's corrosion on the enamel or something but had happened on its own during storage.
I used it the other night and noticed that some notes don't sustain very well and depending on the frequency, I.e higher pitched notes were not playing very well or with much of an arc at times.
I cranked the thing up to full power and noticed some pin prick blue Corona all around the coil, and seems to happen around these parts of the secondary that are discolored.
I could see upon inspection that it's now burned through the polyurethane, do I'm going to have to rewind this coil again
Could this have been the issue with the coil not sounding right?
I'm wondering it is possible that arcing across the secondary behind the winding where I can't see it?
I want to use epoxy this time round. It is moisture cured floor polyurethane.
Is there an epoxy that can be applied first prior to winding that  will dry within a few minutes and help set the wire onto the pipe?
There is nothing really holding this onto the pipe and it's actually lifting a bit in places it appears.
See photo.

Offline davekni

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Re: Enamel on secondary breaking down?
« Reply #1 on: April 09, 2023, 10:05:13 PM »
Quote
s there an epoxy that can be applied first prior to winding that  will dry within a few minutes and help set the wire onto the pipe?
There is nothing really holding this onto the pipe and it's actually lifting a bit in places it appears.
First, I hope you will get other responses if anyone has seen similar issues.

I haven't experienced this personally, but definitely worry about it, especially with different CTE (coefficient of thermal expansion) for copper and coil form/core.  Ideal would be to coat coil under vacuum for full fill under and above winding.  I've considered whether it would be possible to coat under winding as you mention.  However, I'd think the ideal undercoat would not cure until after coil is wound.

Out of concern for delamination and/or corona under secondary windings, here's what I did:  Wind coil without undercoat (as can't think of a good undercoat option).  Spray on urethane enamel clear coat and wait for it to dry.  Repeat once more, waiting even longer for thorough drying.  Then apply several layers of 2-part urethane epoxy.  The spray-on enamel starts out thin due to solvents, so penetrates under windings.  Goal is to fill under/between windings that way before applying the thicker epoxy layers.

Good luck!
David Knierim

Offline MRMILSTAR

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Re: Enamel on secondary breaking down?
« Reply #2 on: April 09, 2023, 10:48:31 PM »
I have used brush-on polyurethane on both of my Tesla coils. One is a large SGTC with a 8.6" diameter secondary coil. The other is a medium-sized VTTC. I apply the polyurethane as the coil is continuously turned. I apply 3 or 4 coats allowing each coat to dry before applying the next. Both of these coils were completed several years ago and have experienced temperature extremes from 40 degrees F to about 90 degrees F. I have never experienced any problem with the coils becoming loose.
Steve White
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Retired electrical engineer

Offline nzoomed

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Re: Enamel on secondary breaking down?
« Reply #3 on: April 10, 2023, 12:48:08 AM »
Quote
s there an epoxy that can be applied first prior to winding that  will dry within a few minutes and help set the wire onto the pipe?
There is nothing really holding this onto the pipe and it's actually lifting a bit in places it appears.
First, I hope you will get other responses if anyone has seen similar issues.

I haven't experienced this personally, but definitely worry about it, especially with different CTE (coefficient of thermal expansion) for copper and coil form/core.  Ideal would be to coat coil under vacuum for full fill under and above winding.  I've considered whether it would be possible to coat under winding as you mention.  However, I'd think the ideal undercoat would not cure until after coil is wound.

Out of concern for delamination and/or corona under secondary windings, here's what I did:  Wind coil without undercoat (as can't think of a good undercoat option).  Spray on urethane enamel clear coat and wait for it to dry.  Repeat once more, waiting even longer for thorough drying.  Then apply several layers of 2-part urethane epoxy.  The spray-on enamel starts out thin due to solvents, so penetrates under windings.  Goal is to fill under/between windings that way before applying the thicker epoxy layers.

Good luck!

I'm pretty sure there are fast curing epoxy resins out there.
Even if I have to mix in stages, it will probably be ok.
For whatever reason, I was advised against epoxy at the time and told to go with polyurethane.
However I've seen commercially made coils advertised with epoxy coating.

My main concerns are whether any solvents or other products  applied could potentially damage the enamel.
I'm still not sure what happened to my coil  whether or not it was damaged on the spool and moisture got in, or else if a chemical reaction happened.
I guess I should be able to see if arcing has occurred when I come to rewind and remove the old wire, there should be some marks on the pipe.
When I operated the coil I also noticed that the streamers were quite whispy and fuzzy looking, not clean lines like I typically see. Is this a symptom of a damaged secondary, or could something else be at fault?

Offline davekni

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Re: Enamel on secondary breaking down?
« Reply #4 on: April 10, 2023, 04:53:49 AM »
Quote
For whatever reason, I was advised against epoxy at the time and told to go with polyurethane.
Polyurethane epoxy is available.  That's what I used after the two spray coats.  Common urethane epoxy is intended for coating wood table tops etc.

Quote
When I operated the coil I also noticed that the streamers were quite whispy and fuzzy looking, not clean lines like I typically see. Is this a symptom of a damaged secondary, or could something else be at fault?
Could be either.  Might be worth scoping primary waveforms with existing secondary coil before repair.  See if they look normal, at expected frequency and with resonant energy transfer primary to secondary and back (at least when below arc voltage to minimize energy loss to arc).
David Knierim

Offline nzoomed

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Re: Enamel on secondary breaking down?
« Reply #5 on: April 10, 2023, 09:09:44 AM »
Quote
For whatever reason, I was advised against epoxy at the time and told to go with polyurethane.
Polyurethane epoxy is available.  That's what I used after the two spray coats.  Common urethane epoxy is intended for coating wood table tops etc.

Quote
When I operated the coil I also noticed that the streamers were quite whispy and fuzzy looking, not clean lines like I typically see. Is this a symptom of a damaged secondary, or could something else be at fault?
Could be either.  Might be worth scoping primary waveforms with existing secondary coil before repair.  See if they look normal, at expected frequency and with resonant energy transfer primary to secondary and back (at least when below arc voltage to minimize energy loss to arc).
This is the stuff I used, at the time it seemed a good product.
https://www.uroxsys.co.nz/pdfs/MCRGlossdata.pdf
Is the epoxy polyurethane you refer to a two part mix or single  pack?
I know people who own a paint shop and can get me an endless selection of products.
There is a clear resin I've seen that goes rock hard.
I was thinking another option may be to apply a thinned down coat that can penetrate the winding easier, and then apply thicker coats on top. This stuff I've got is rather soft and flexible, but hard wearing as its for floors.
It doesn't stick to the pvc pipe very well, I can peel it off.
My main concern is if my issues are IGBT damage, but i don't think they fail like that do they? Seems to only be giving issues since the coil has broken down.
Will be interesting to scope the bus again, I know I had it tuned fairly well at the time.
« Last Edit: April 10, 2023, 09:23:54 AM by nzoomed »

Offline davekni

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Re: Enamel on secondary breaking down?
« Reply #6 on: April 11, 2023, 04:23:12 AM »
Quote
Is the epoxy polyurethane you refer to a two part mix or single  pack?
Epoxy is two part.  Spray-on layers are of course single part.
Recent coils use this spray-on:
    Rust-Oleum Painter's Touch 2x Ultra Cover Matte Clear.
It claims UV resistance and bonding to most plastics.  Purchased at local home improvement store.  Don't recall if my DRSSTC used this or an older version.
Epoxy (two parts in equal volume) for my larger standard DRSSTC is:
    Parks Super Glaze Pour-on Finish & Preservative, Ultra Gloss Epoxy
It is not UV resistant and cures softer than most epoxies.  It is also made by Rust-Oleum.  I'm not sure if the softer cure is better for handling thermal expansion or not.
My more recent QCW secondary used:
    Max 1618 Crystal Clear Low Viscosity
It is a 2:1 mix ratio and cures hard.  So far no issues, but this coil hasn't been pushed hard yet.

Quote
My main concern is if my issues are IGBT damage, but i don't think they fail like that do they?
Probably not.  More wondering about some issue in control electronics.  If one side of a full H-bridge failed, could cause poor performance, but I can't think of any reason it would be correlated to secondary discoloring.
David Knierim

Offline nzoomed

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Re: Enamel on secondary breaking down?
« Reply #7 on: April 11, 2023, 01:20:32 PM »
Quote
Is the epoxy polyurethane you refer to a two part mix or single  pack?
Epoxy is two part.  Spray-on layers are of course single part.
Recent coils use this spray-on:
    Rust-Oleum Painter's Touch 2x Ultra Cover Matte Clear.
It claims UV resistance and bonding to most plastics.  Purchased at local home improvement store.  Don't recall if my DRSSTC used this or an older version.
Epoxy (two parts in equal volume) for my larger standard DRSSTC is:
    Parks Super Glaze Pour-on Finish & Preservative, Ultra Gloss Epoxy
It is not UV resistant and cures softer than most epoxies.  It is also made by Rust-Oleum.  I'm not sure if the softer cure is better for handling thermal expansion or not.
My more recent QCW secondary used:
    Max 1618 Crystal Clear Low Viscosity
It is a 2:1 mix ratio and cures hard.  So far no issues, but this coil hasn't been pushed hard yet.

Quote
My main concern is if my issues are IGBT damage, but i don't think they fail like that do they?
Probably not.  More wondering about some issue in control electronics.  If one side of a full H-bridge failed, could cause poor performance, but I can't think of any reason it would be correlated to secondary discoloring.
There are single pack epoxy resins out there, but they use various different means to cure, i.e UV light.
I also haven't heard of epoxy polyurethane before, I thought they were two entirely different things. You will probably find that such products are a mixture of both perhaps?
I will do research into this anyway, there are ton of different resins on the market, but I don't think the ones you mention are readily available in NZ.
Fibreglass resins go yellow over time and actually break down rather bad.
But I have seen resins that stay Crystal Clear and go rock hard, that's the sort of stuff I'm looking for.
Is thermal expansion something that a coil can experience under use? I've never measured the temperature of mine during use, bit I've got an infra red thermometer.

It did cross my mind if control electronics could be partly to blame. My driver is loneoceans universal driver v2.7
One of the main issues I've had is shielding the computer and/or USB midi adapter.
The RF causes it to lock up and hang on a note.
Sometimes it's not quite bad enough to hang the unit, but it's causing some notes to sound like garbage at times.

I dont know if I need a longer fibre optic cable or try shielding the computer better.
I've got toroids on the USB cable that help, but it's not perfect and can't play music at full power.
Maybe a better midi adapter could help?

« Last Edit: April 11, 2023, 01:22:12 PM by nzoomed »

Offline davekni

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Re: Enamel on secondary breaking down?
« Reply #8 on: April 12, 2023, 05:46:43 AM »
Quote
I also haven't heard of epoxy polyurethane before, I thought they were two entirely different things.
After some google searching, I am probably wrong here.  My apparently-incorrect memory was that Parks glaze coat was a urethane based epoxy and that such was common.  I find nothing now supporting that memory.

Quote
It did cross my mind if control electronics could be partly to blame. My driver is loneoceans universal driver v2.7
One of the main issues I've had is shielding the computer and/or USB midi adapter.
The RF causes it to lock up and hang on a note.
Sometimes it's not quite bad enough to hang the unit, but it's causing some notes to sound like garbage at times.

I dont know if I need a longer fibre optic cable or try shielding the computer better.
I've got toroids on the USB cable that help, but it's not perfect and can't play music at full power.
Maybe a better midi adapter could help?
I've also had trouble with MIDI notes getting stuck on.  It isn't a hang of the electronics, but rather a disruption at the point when the key-release code is transmitted.  Playing the same note again will unstick the note on that release.  In my case, MIDI is coming from a keyboard (synthesizer) for live music.  It is difficult to determine if the disruption is within keyboard (MIDI source), communication link, or MIDI interpreter.  I ended up with grounded metal under keyboard with foil extending around back side and over half of top.  Placed MIDI interrupter within that shielding and powered both from batteries also within shielding.  Probably not all necessary.  Seems that the keyboard itself is most sensitive.  It is a large object with plastic housing.

What MIDI interpreter are you using?  Being in a hurry back in 2019, I purchased a kit from EVR.  It is not very good.  Some notes are up to 2% off in frequency.  Worse, more than two notes playing simultaneously outputs garbage.  Made my own soon after.
David Knierim

Offline nzoomed

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Re: Enamel on secondary breaking down?
« Reply #9 on: April 12, 2023, 02:02:59 PM »
Quote
I also haven't heard of epoxy polyurethane before, I thought they were two entirely different things.
After some google searching, I am probably wrong here.  My apparently-incorrect memory was that Parks glaze coat was a urethane based epoxy and that such was common.  I find nothing now supporting that memory.

Quote
It did cross my mind if control electronics could be partly to blame. My driver is loneoceans universal driver v2.7
One of the main issues I've had is shielding the computer and/or USB midi adapter.
The RF causes it to lock up and hang on a note.
Sometimes it's not quite bad enough to hang the unit, but it's causing some notes to sound like garbage at times.

I dont know if I need a longer fibre optic cable or try shielding the computer better.
I've got toroids on the USB cable that help, but it's not perfect and can't play music at full power.
Maybe a better midi adapter could help?
I've also had trouble with MIDI notes getting stuck on.  It isn't a hang of the electronics, but rather a disruption at the point when the key-release code is transmitted.  Playing the same note again will unstick the note on that release.  In my case, MIDI is coming from a keyboard (synthesizer) for live music.  It is difficult to determine if the disruption is within keyboard (MIDI source), communication link, or MIDI interpreter.  I ended up with grounded metal under keyboard with foil extending around back side and over half of top.  Placed MIDI interrupter within that shielding and powered both from batteries also within shielding.  Probably not all necessary.  Seems that the keyboard itself is most sensitive.  It is a large object with plastic housing.

What MIDI interpreter are you using?  Being in a hurry back in 2019, I purchased a kit from EVR.  It is not very good.  Some notes are up to 2% off in frequency.  Worse, more than two notes playing simultaneously outputs garbage.  Made my own soon after.

With my unit, the USB MIDI device would stop working and stay stuck on a note forever.
I have to disconnect it from the USB port to reset the thing or else it wont work at all again, seems to be causing it to lock up or something, but either way, tie computer stops communicating with it because starting another track does nothing to help it.
I have wanted to try it out with a keyboard over a MIDI cable but dont know how i set the channel on my keyboard to the correct one the MIDI controller is using.

My MIDI controller is called a "mini MIDI controller" see here:
https://sites.google.com/site/teslacoilstore/mmtcc
They seemed to be popular at the time I built my coil. I was also advised early on to add the toroids to the MIDI cable, as i was having issues right from get go. They do help, but its not a solution to remove it all, perhaps i need a better shielded box, tin foil is doing nothing.
Im interested to see what these new MIDI interrupters are like that will work with more than 2 notes at a time.
Great to see technology improving.

Offline nzoomed

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Re: Enamel on secondary breaking down?
« Reply #10 on: April 19, 2023, 08:09:04 AM »
I'm looking at using epoxy doming resin on the rewind.
Does this sound suitable?
It looks like it goes rock hard, but has a long cure time, however I see UV curable ones on the market too but don't know what the quality is like.

Offline davekni

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Re: Enamel on secondary breaking down?
« Reply #11 on: April 20, 2023, 05:45:28 AM »
Quote
I'm looking at using epoxy doming resin on the rewind.
Does this sound suitable?
Probably fine, at least for outer coats.  Unlikely to penetrate between windings to fill between windings and core tube.  Something with much lower viscosity and lower surface tension would be better for penetration.  Need for penetration depends on your secondary volts/turn  I don't have enough experience to say if penetration is needed, not even for my own coils.

Quote
I see UV curable ones on the market too but don't know what the quality is like.
There are fine UV epoxies, even ones hard enough to use for dental fillings.  I have no way to tell quality of any specific UV epoxy.  UV epoxies require a minimum light intensity for curing.  Low intensity can't be compensated for completely with long exposure times.  UV cured epoxy might be a good option for coating core before winding.  Will remain uncured plenty long for winding.  Add another coat after winding and expose to UV.  Cure is a chain reaction to some extent (depending on epoxy formulation).  I think epoxy under wire is likely to cure due to exposure of upper layer to UV even though not receiving any direct exposure.  Would need to be tested for any given UV-cure epoxy, however, or discerned from data sheet if available.
« Last Edit: April 20, 2023, 06:22:20 AM by davekni »
David Knierim

Offline nzoomed

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Re: Enamel on secondary breaking down?
« Reply #12 on: April 30, 2023, 02:32:50 AM »
Quote
I'm looking at using epoxy doming resin on the rewind.
Does this sound suitable?
Probably fine, at least for outer coats.  Unlikely to penetrate between windings to fill between windings and core tube.  Something with much lower viscosity and lower surface tension would be better for penetration.  Need for penetration depends on your secondary volts/turn  I don't have enough experience to say if penetration is needed, not even for my own coils.

Quote
I see UV curable ones on the market too but don't know what the quality is like.
There are fine UV epoxies, even ones hard enough to use for dental fillings.  I have no way to tell quality of any specific UV epoxy.  UV epoxies require a minimum light intensity for curing.  Low intensity can't be compensated for completely with long exposure times.  UV cured epoxy might be a good option for coating core before winding.  Will remain uncured plenty long for winding.  Add another coat after winding and expose to UV.  Cure is a chain reaction to some extent (depending on epoxy formulation).  I think epoxy under wire is likely to cure due to exposure of upper layer to UV even though not receiving any direct exposure.  Would need to be tested for any given UV-cure epoxy, however, or discerned from data sheet if available.

I think that it would be ideal for the resin to penetrate the windings, even if it had a lower viscosity, i feel it would have trouble doing so. Vaccuum impregnation would be the ultimate but very difficult and expensive for a coil this size.
My main concern was how the coil was lifting off the tube. It was almost like it had either overheated or expanded? Im not sure if that was the issue or if the wire was wound on too loose?

Yes UV curing resin would have the big issue of not getting enough light under the winding itself to cure, however it does go off on its own if given enough time, and a chain reaction should happen if only a handful of molecules get exposed to the UV or get in contact with the outer layer when exposed. Might be worth exploring this further.

Not too sure what others do with their coils, but definitely going with epoxy this time round.

Offline Twospoons

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Re: Enamel on secondary breaking down?
« Reply #13 on: May 02, 2023, 01:42:47 AM »
UV cured resin also suffers from oxygen inhibition at the surface.  This is overcome with either very intense UV light, or inert gas (N2 and CO2 are good enough).
Otherwise you end up with a sticky surface.

Personally I'd stay with some form of addition cure - epoxy or polyester. You can always accelerate epoxy cure with heat. And you can accelerate polyester cure by adding more catalyst.  Polyester is also nice in that it will gel well before cure, whereas epoxy just gets more viscous as it cures.

Offline orac

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Re: Enamel on secondary breaking down?
« Reply #14 on: September 19, 2023, 04:29:14 AM »
I had a similar issue. I could not see it on the face of the coil like yours with the discoloration. But after checking everything and finally deciding to strip the secondary in chase of trying to find a problem of degraded performance, I found the secondary had been arcing behind the coil and along the PVC tube.

When this was constructed it was first sprayed with spray on urethane, wound, and then multiple layers of the same spray to fill any gaps over the coil. Then finally coated in a 2 pot epoxy.

Unfortunately I will need to rebuild the coil.

Offline davekni

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Re: Enamel on secondary breaking down?
« Reply #15 on: September 19, 2023, 06:29:00 AM »
Quote
When this was constructed it was first sprayed with spray on urethane, wound, and then multiple layers of the same spray to fill any gaps over the coil. Then finally coated in a 2 pot epoxy.

Unfortunately I will need to rebuild the coil.
This is almost exactly how I built my DRSSTC secondary.  (Except for later addition of several more layers of epoxy to reduce racing sparks.)  So far it has worked fine, 4 years of occasional use.  Perhaps depends on particular spray on urethane, on wire gauge, or some other factor.  My secondary is 24AWG.

Good luck with rebuild.  Not sure what to suggest as being better.
David Knierim

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Re: Enamel on secondary breaking down?
« Reply #15 on: September 19, 2023, 06:29:00 AM »

 


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Simranjit
July 08, 2024, 04:28:43 AM
post Re: Tesla coil in FEMM
[Beginners]
davekni
July 08, 2024, 04:06:53 AM
post Tesla coil in FEMM
[Beginners]
Simranjit
July 08, 2024, 03:46:49 AM
post Re: Best core material for QCW Buck modulator ?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Simranjit
July 08, 2024, 02:42:00 AM
post Re: QCWDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ZakW
July 08, 2024, 01:37:55 AM
post Re: First DRSSTC Build- Issues with Fibernet project
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Sebigamer
July 08, 2024, 12:53:08 AM
post Re: QCWDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Anders Mikkelsen
July 08, 2024, 12:49:48 AM
post Re: Silicon(e) plasma
[General Chat]
alan sailer
July 07, 2024, 11:15:35 PM
post Silicon(e) plasma
[General Chat]
MechatEng2023
July 07, 2024, 11:04:43 PM
post Re: QCWDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ZakW
July 07, 2024, 09:39:07 PM
post Re: First DRSSTC Build- Issues with Fibernet project
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
July 07, 2024, 05:32:56 PM
post Re: QCWDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Anders Mikkelsen
July 07, 2024, 02:52:19 PM
post Re: No change in Phase Lead
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Anders Mikkelsen
July 07, 2024, 02:50:04 PM
post Re: Best core material for QCW Buck modulator ?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Anders Mikkelsen
July 07, 2024, 02:20:11 PM
post Teardown of a APC SmartUPS VT 40 kVA
[Electronic Circuits]
Mads Barnkob
July 07, 2024, 10:02:22 AM
post First DRSSTC Build- Issues with Fibernet project
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Sebigamer
July 07, 2024, 09:23:58 AM
post Re: QCWDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ZakW
July 07, 2024, 12:44:53 AM
post Re: FEMM tesla coil simulation
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Simranjit
July 07, 2024, 12:08:50 AM
post Re: FEMM tesla coil simulation
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
July 06, 2024, 10:35:49 PM
post FEMM tesla coil simulation
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Simranjit
July 06, 2024, 09:42:43 PM
post Re: No change in Phase Lead
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
July 06, 2024, 06:06:23 PM
post Re: No change in Phase Lead
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Admiral Aaron Ravensdale
July 06, 2024, 10:21:16 AM
post Re: No change in Phase Lead
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Admiral Aaron Ravensdale
July 06, 2024, 10:15:42 AM
post Re: QCWDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Simranjit
July 06, 2024, 04:53:56 AM
post Re: No change in Phase Lead
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
July 06, 2024, 04:42:16 AM
post Re: QCWDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
July 06, 2024, 04:09:50 AM
post Re: Best core material for QCW Buck modulator ?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
July 06, 2024, 03:07:11 AM
post Re: No change in Phase Lead
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
July 06, 2024, 03:05:18 AM
post Re: QCWDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ZakW
July 06, 2024, 02:37:16 AM
post Re: QCWDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Simranjit
July 06, 2024, 02:20:14 AM
post QCWDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ZakW
July 06, 2024, 01:55:14 AM
post Re: No change in Phase Lead
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
July 05, 2024, 11:50:37 PM
post Best core material for QCW Buck modulator ?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Simranjit
July 05, 2024, 10:07:04 PM
post 230v Tesla coil and krypton gas
[Spark Gap Tesla Coils (SGTC)]
gravitysrainbow
July 05, 2024, 07:13:25 PM
post Re: No change in Phase Lead
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Admiral Aaron Ravensdale
July 05, 2024, 06:17:13 PM
post Re: Phase lead inductors
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
July 04, 2024, 11:40:45 PM
post Re: Sling Psychrometer
[Laboratories, Equipment and Tools]
Twospoons
July 04, 2024, 11:02:32 PM
post Phase lead inductors
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
July 04, 2024, 06:28:08 PM
post Re: Sling Psychrometer
[Laboratories, Equipment and Tools]
klugesmith
July 04, 2024, 12:31:40 AM
post Re: FIRST DRSSTC SKM400GB128D OCD SETTING
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Alex_1996
July 04, 2024, 12:07:21 AM
post Re: FIRST DRSSTC SKM400GB128D OCD SETTING
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Alex_1996
July 04, 2024, 12:06:17 AM
post Re: FIRST DRSSTC SKM400GB128D OCD SETTING
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
July 03, 2024, 10:51:23 PM
post Re: FIRST DRSSTC SKM400GB128D OCD SETTING
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
July 03, 2024, 09:44:14 PM
post Re: Coax cable for DRSSTC interrupter?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Admiral Aaron Ravensdale
July 03, 2024, 08:48:13 PM
post Re: Coax cable for DRSSTC interrupter?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Simranjit
July 03, 2024, 08:24:50 PM
post Re: FIRST DRSSTC SKM400GB128D OCD SETTING
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Alex_1996
July 03, 2024, 08:12:55 PM
post Re: Coax cable for DRSSTC interrupter?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Admiral Aaron Ravensdale
July 03, 2024, 07:29:53 PM
post Re: FIRST DRSSTC SKM400GB128D OCD SETTING
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Admiral Aaron Ravensdale
July 03, 2024, 07:21:38 PM
post Re: FIRST DRSSTC SKM400GB128D OCD SETTING
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
July 03, 2024, 05:05:39 PM
post Re: FIRST DRSSTC SKM400GB128D OCD SETTING
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Alex_1996
July 03, 2024, 04:29:53 PM
post Re: FIRST DRSSTC SKM400GB128D OCD SETTING
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
July 03, 2024, 04:09:11 PM
post FIRST DRSSTC SKM400GB128D OCD SETTING
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Alex_1996
July 03, 2024, 02:47:18 PM
post Re: Eliminating discharges from a SSTC
[Solid State Tesla Coils (SSTC)]
Alex_1996
July 03, 2024, 01:35:24 PM
post Re: Coax cable for DRSSTC interrupter?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
July 03, 2024, 02:19:03 AM
post Re: Coax cable for DRSSTC interrupter?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
verliebt_in_neukölln17
July 03, 2024, 01:19:50 AM
post Coax cable for DRSSTC interrupter?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Simranjit
July 02, 2024, 11:29:18 PM
post Re: Is this a good pulse experiment capacitor?
[Capacitor Banks]
Mads Barnkob
July 02, 2024, 09:59:07 PM
post Re: LabCoatz Staccato QCW No straight sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ZakW
July 02, 2024, 09:55:53 PM
post Re: Capacitor wiring for single phase 240 to split phase (180 degree) 240v
[Capacitor Banks]
klugesmith
July 02, 2024, 09:44:55 PM
post Re: LabCoatz Staccato QCW No straight sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Admiral Aaron Ravensdale
July 02, 2024, 07:51:37 PM
post Re: LabCoatz Staccato QCW No straight sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ZakW
July 02, 2024, 06:14:07 PM
post Is this a good pulse experiment capacitor?
[Capacitor Banks]
FPS
July 02, 2024, 06:02:38 PM
post Re: LabCoatz Staccato QCW No straight sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Admiral Aaron Ravensdale
July 02, 2024, 11:37:46 AM
post Re: Building my first DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
July 02, 2024, 05:22:10 AM
post Re: Coulometric hourmeters
[Laboratories, Equipment and Tools]
davekni
July 02, 2024, 05:16:30 AM
post Re: Building my first DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
drobotk
July 01, 2024, 11:50:12 PM
post Re: Restoring a Rogowski coil calibrator
[Capacitor Banks]
klugesmith
July 01, 2024, 08:48:53 PM
post Uses for Weston's Little Bee probe
[Laboratories, Equipment and Tools]
klugesmith
July 01, 2024, 08:40:59 AM
post Re: Coulometric hourmeters
[Laboratories, Equipment and Tools]
klugesmith
July 01, 2024, 08:09:42 AM
post Re: Coulometric hourmeters
[Laboratories, Equipment and Tools]
davekni
June 30, 2024, 06:49:45 AM

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