Author Topic: Ramped SSTC - Power Supply Question + General Improvements  (Read 14600 times)

Offline ZakW

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #60 on: August 21, 2023, 02:27:09 AM »
Quote
That entire node (entire copper shape) could use 1-1.5mm clearance, including at the secondary output connector lower pin (both layers), around mounting hole, and gap to other copper shapes.  Probably OK at 0.6mm, but a bit more would be good.  If connector pads themselves are closer together, may not be worth the work of editing the connector part itself in layout tool.  Even 0.6mm will typically handle 500V fine for the limited total use time of hobby equipment.

I was wondering if the additional spacing would make a difference in the end if the connector pins were only 0.6m anyway. To be safe I updated the part to a 1x3 header and just wont use the middle pin. That should give me 1.2mm total spacing without too much effort. I also increased the pad clearance to the neutral plane to 1mm for C19/C20 as well as the output pins.

Offline davekni

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #61 on: August 21, 2023, 03:47:13 AM »
Quote
I was wondering if the additional spacing would make a difference in the end if the connector pins were only 0.6m anyway.  To be safe I updated the part to a 1x3 header and just wont use the middle pin.
Are the pins themselves 0.6mm spaced?  That would imply a very tiny connector.  Or is it the ECB pads of the connector part that are 0.6mm?  If it is the latter and it became a problem, the pad copper could be cut back a bit with a knife.  That's why I was a bit less concerned about that one location.  However, your 3-pin connector is a great solution.  I've seen that used in commercial equipment for the same reason.
David Knierim

Offline ZakW

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #62 on: August 21, 2023, 04:37:49 AM »
Quote
Are the pins themselves 0.6mm spaced?  That would imply a very tiny connector.  Or is it the ECB pads of the connector part that are 0.6mm?  If it is the latter and it became a problem, the pad copper could be cut back a bit with a knife.  That's why I was a bit less concerned about that one location.  However, your 3-pin connector is a great solution.  I've seen that used in commercial equipment for the same reason.

The connector pins are 3.96mm on center with a 0.8mm gap between them. The thin yellow line is the 1mm clearance I added.





Updated front and back copper planes:







Offline davekni

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #63 on: August 21, 2023, 04:46:36 AM »
Quote
The connector pins are 3.96mm on center with a 0.8mm gap between them. The thin yellow line is the 1mm clearance I added.
Thank you for the images.  Looks great!

I was misunderstanding just due to semantics.  To me "pins" refer to the metal pins of the physical connector.  The ECB shape for the connector includes pads to which the pins are soldered.  It is those ECB pads that have 0.8mm space between them.
David Knierim

Offline ZakW

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #64 on: August 21, 2023, 05:15:27 AM »
Quote
Thank you for the images.  Looks great!

Thanks! Excited to get them ordered. While I wait I can start working on the enclosure.

Quote
I was misunderstanding just due to semantics.  To me "pins" refer to the metal pins of the physical connector.  The ECB shape for the connector includes pads to which the pins are soldered.  It is those ECB pads that have 0.8mm space between them.

Good point, apologies for the confusion.

Offline ZakW

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #65 on: September 01, 2023, 09:10:24 PM »
V7 is up and running!!





Aside from KiCads footprint for the SOT-23 version of the 3904 transistor pins being flipped I haven't found any other mistakes.

So far this seems the most stable of all the builds with a very consistent output.

---------------------------------------------------------------

I am still testing and making adjustments. I wound a new smaller coil to get closer to ~450-420kHz range. I am hitting 20in (50.8cm) but I still need to fine tune C19/C20 as well as the primary placement.

The new coil measures in at 1.73in (44mm) using 44awg wire = Output is roughly 11.6x the length of the secondary  :D





---------------------------------------------------------------

Couple questions regarding the spikes I am seeing on Q1 & Q2 Vgs:
  • Using my differential probe set to 50x, are the spikes really there or just an artifact of scoping/long probe length?
  • If they are really present, are they harmful to the IGBTs and how might I reduce them?

Here is a close up of Q1 Vgs




I noticed that the spikes develop over time before eventually going away as the coil ramps back down... Here is the beginning, middle, and end.




Here is the Vgs waveform without power to the bridge:


Finally, here is a comparison of the output of the UCC vs Q1 Vgs over time.
Purple = UCC output (after capacitor)
Blue = Q1 Vgs





Again you can see the spikes get worse in the middle of the on period before disappearing again.

---------------------------------------------------------------

Other than that the performance seems great and I am very happy with it. I just want to make sure this issue isn't a design flaw or something else that could hurt the IGBTs.
« Last Edit: September 01, 2023, 09:12:36 PM by ZakW »

Offline davekni

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #66 on: September 01, 2023, 10:32:13 PM »
Is your positive differential probe connected to gate and negative to emitter?  Or reversed (ie. scoping Veg instead of Vge)?  As shown, Vge rise time is shorter than fall time, which would suggest that D6 and D7 are backwards.
Are you scoping low-side IGBT (one with emitter to neutral)?  That reduces affect of differential probe leads.  Twisting leads together from probe up to clips also helps.
David Knierim

Offline ZakW

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #67 on: September 01, 2023, 11:48:01 PM »
Hello Dave,

Well I feel silly, D6 & D7 were backwards (+1 PCB error). Thank you!. But the scope shots still look really similar, maybe slightly faster turn off.

I confirmed I am probing positive lead to pin 1 of Q1 and negative lead to pin 3.

For the UCC if it matters I am probing output B after the 3.3uf cap, other lead is going to ground.

Here are some more captures after correcting D6/7.

Q1 Vge without powering the bridge


Q1 Vge Beginning vs Middle



Q2 vs UCC output



I overlaid Q1 and Q2 and made one transparent. If I understand correctly, it looks like Q1 (brighter blue) is turning off before Q2 is turning on. Which is what I am after right?



Here I overlaid Q1 before and after fixing D6/7. Green trace is with the diodes fixed showing the IGBTs turning off more quickly, right?


« Last Edit: September 02, 2023, 12:06:16 AM by ZakW »

Offline davekni

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #68 on: September 02, 2023, 02:42:30 AM »
Quote
But the scope shots still look really similar, maybe slightly faster turn off.
Yes, looks to me like slower turn-on too, as it should be.

Quote
I overlaid Q1 and Q2 and made one transparent. If I understand correctly, it looks like Q1 (brighter blue) is turning off before Q2 is turning on. Which is what I am after right?
Yes.  Gate signals by themselves don't guarantee turn-off is before turn-on.  Most IGBTs have less turn-on delay than turn-off delay.  I'd guess you have sufficient dead-time (enough extra gate time to accommodate difference in IGBT delays).

The spikes in Vge are most likely caused by Cdg (Miller charge).  They likely occur simultaneously with half-bridge output transition.  That is one reason they are worse at the middle where half-bridge voltage transitions are largest.  I doubt the spikes are causing any problems.
David Knierim

Offline ZakW

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #69 on: September 02, 2023, 05:26:43 AM »
Quote
Yes, looks to me like slower turn-on too, as it should be.

Thanks for confirming that. I am glad it looks correct now.

Quote
The spikes in Vge are most likely caused by Cdg (Miller charge).  They likely occur simultaneously with half-bridge output transition.  That is one reason they are worse at the middle where half-bridge voltage transitions are largest.  I doubt the spikes are causing any problems.

I appreciate the context! I tried googling the Miller charge and waveform examples to see if I could find something similar before asking but I was unsuccessful. Glad to know they are not causing any issues.

Offline davekni

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #70 on: September 02, 2023, 06:14:59 AM »
Quote
I tried googling the Miller charge and waveform examples to see if I could find something similar before asking but I was unsuccessful.
Yes, classic Miller charge effect is a flat spot (plateau) in Vge.  However, in cases where Vge has finished transitioning before IGBT output switches, the Miller charge becomes a glitch in Vge.
David Knierim

Offline ZakW

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #71 on: September 15, 2023, 08:44:16 PM »
Question on grounding my coil while I am working on the enclosure for it. 

For all of my testing I have been using the mains ground via a cheap line filter I picked up on Amazon - https://www.amazon.com/Comimark-Filter-CW1D-10A-T-Suppressor-Power/dp/B07X3C345J/ref=sr_1_3_pp?keywords=ac+line+filter&qid=1694802673&sr=8-3 wiring my Secondary directly to it. I have tested a quick one sheet tinfoil counterpoise but I noticed the arcs were louder (snapping and popping). I assume the overall size was not providing sufficient capacitance to sink currents from the coil?

Ideally I would like to run this coil in several environments, home and work (standard commercial office) mainly. But I am concerned with EMI/RFI in the office area especially using the mains ground (I understand this is not suggested). What are my options? I was going to try testing a larger counterpoise, spray gluing tinfoil to a 18x18in piece of thin plywood to see if the arc appearance and sound matches what I see when I am connected to my mains ground.

Is my basic line filter doing much at these frequencies (~400kHz)?

For running it at the office it would be in a large open conference room not near computers or other office equipment... I also run the coil at very low BPS. I did see a nicer line filter with 2 inductor stages as opposed to the single stage mine has, might that be a better choice?
 

Offline davekni

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #72 on: September 16, 2023, 05:58:06 AM »
Quote
I have tested a quick one sheet tinfoil counterpoise but I noticed the arcs were louder (snapping and popping). I assume the overall size was not providing sufficient capacitance to sink currents from the coil?
Perhaps.  If too small, maybe snapping and popping is due to some small arcs between bottom of secondary and primary, if secondary bottom isn't close to ground potential?  I don't have personal experience here.  I always ground everything to both a large counterpoise and to line ground.

Quote
Is my basic line filter doing much at these frequencies (~400kHz)?
I'd guess so.  400kHz is above many power supply PFC input stage switching frequencies.  Filtering applies to line and neutral.  Ground is not filtered.
David Knierim

Offline ZakW

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #73 on: September 16, 2023, 06:21:15 AM »
Quote
Perhaps.  If too small, maybe snapping and popping is due to some small arcs between bottom of secondary and primary, if secondary bottom isn't close to ground potential?  I don't have personal experience here.  I always ground everything to both a large counterpoise and to line ground.

I haven't noticed any arcing from secondary to primary when using the counterpoise. The counterpoise was about 1.5in below the coil base. The popping sounded more like when I add too much smoothing capacitance and I flatten the mains half cycle ramp.

Quote
I'd guess so.  400kHz is above many power supply PFC input stage switching frequencies.  Filtering applies to line and neutral.  Ground is not filtered.

I was thinking about making a custom filter for my frequencies but I am not sure at this point. My coil is physically small and relatively low powered compared to other builds I have seen. Will grounding it to mains really be an issue?

Also, is using a counterpoise inconjunction with grounding to mains better than not using a couterpoise? Grouding is still a confusing topic to me.
« Last Edit: September 16, 2023, 09:15:16 PM by ZakW »

Offline ZakW

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #74 on: September 29, 2023, 05:49:38 AM »
After 1year and 10months this project has come to an end! I still plan on providing lessons learned and my final schematic complete with all my edits and reasons for specific part values etc.

I will post a video as soon as I can. Boxing it up has caused some issues with stability. Still working through the problem but for now I am out of IGBTs  :(

Here are some pictures of the final build as well as a snip from Java TC.

  • 44awg secondary 2in (53mm) tall 1.9 (48.26mm) diameter
  • 2 turn primary 16awg
  • Current output 18.75in (47.6cm)!! After boxing it up I cant seem to get it to hit 20 again, still working on it.
  • Little over 9x the secondary length!
  • Case dimensions (LxWxH) 4inx4inx4.5in (10.16cmx10.16cmx11.43cm)
  • Secondary is sealed inside larger PCV pipe with Epoxy for insulation
  • 1 Protoboard and 6 PCB iterations, Number 7 being the final version

Not sure why some images are rotated.




















HUGE thanks to Dave! Without your continued assistance and knowledge I would have not been able to complete this project, thank you.

Also want to give Magneticitist a shoutout. Your RSSTC YouTube videos are what inspired me to start this project in the first place, thank you.

I have learned a lot in the last couple years and I plan on continuing my efforts and start on a DRSSTC next.

« Last Edit: September 29, 2023, 08:27:58 AM by ZakW »

Offline davekni

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #75 on: September 29, 2023, 09:35:21 PM »
Great little coil!  Much nicer packaging than anything I build.

Quote
HUGE thanks to Dave! Without your continued assistance and knowledge I would have not been able to complete this project, thank you.
You are certainly welcome!  I'm happy that my advice was useful.

Quote
Also, is using a counterpoise inconjunction with grounding to mains better than not using a couterpoise? Grouding is still a confusing topic to me.
Quote
I haven't noticed any arcing from secondary to primary when using the counterpoise. The counterpoise was about 1.5in below the coil base. The popping sounded more like when I add too much smoothing capacitance and I flatten the mains half cycle ramp.
Yes, grounding can be confusing.  There are typically grounded objects scattered around a room along with dielectric materials such as walls.  For a small coil away from walls etc., shouldn't be too problematic.  Counterpoise and line ground together should work fine.  Only other possibility that comes to mind for popping sound is that line zero crossing detect circuit is unintentionally sensitive to surrounding fields.  You could check this with scope a ways away from coil, so coil remains packaged.  Scope line voltage with one probe and use the other as an antenna to pick up secondary voltage.  See if bursts continue to start at line zero crossing when popping sound occurs.
David Knierim

Offline ZakW

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #76 on: October 02, 2023, 04:53:08 AM »
Quote
Great little coil!  Much nicer packaging than anything I build.

Thanks! I am really happy with how it turned out. I think I shrunk it down just about as much as possible.

I am also happy with the arc output length compared to the secondary coil.

Offline ZakW

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #77 on: October 07, 2023, 08:13:22 AM »
Finally, here is a video of it running. I will eventually post my schematic and additional information about the build when I have time.

Thank you, enjoy!

/>

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #78 on: January 05, 2024, 06:40:43 AM »
Here is the complete schematic and a new video of the coil - https://www.youtube.com/watch?v=qWJppGEjx-A&ab_channel=QZWLabs



Once it was all in the case I wasn't able to get close to 21inch output like I once was. Typical output is now around 16inches, if I spend some extra time adjusting everything I can get 18in. Overall, this project was a great success. Not only did a learn a TON but I built my smallest most compact coil to date. Considering its size compared to the output (only a half bridge on 120v mains) I am really happy with that.

My new PCBs will be arriving tomorrow so I can begin working on the dual resonant full bridge!
« Last Edit: January 05, 2024, 06:42:19 AM by ZakW »

Offline davekni

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Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #79 on: January 05, 2024, 07:56:27 PM »
Quote
Once it was all in the case I wasn't able to get close to 21inch output like I once was. Typical output is now around 16inches, if I spend some extra time adjusting everything I can get 18in. Overall, this project was a great success. Not only did a learn a TON but I built my smallest most compact coil to date. Considering its size compared to the output (only a half bridge on 120v mains) I am really happy with that.
Sounds like good performance.  Two possibilities come to mind for the bit of reduction you experience once packaged.  One is that the spread out circuitry may have acted like a counterpoise.  Perhaps try setting your coil on a large piece of grounded foil or other metal.  Other thought is that circuitry or frame structure may be close enough to primary and secondary to block some magnetic field or absorb energy from the field (induction heating).
David Knierim

High Voltage Forum

Re: Ramped SSTC - Power Supply Question + General Improvements
« Reply #79 on: January 05, 2024, 07:56:27 PM »

 


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[Laboratories, Equipment and Tools]
klugesmith
June 05, 2024, 01:42:04 AM
post Re: Coulometric hourmeters
[Laboratories, Equipment and Tools]
klugesmith
June 04, 2024, 10:31:58 PM
post Re: My completed 14-stage Cockroft-Walton voltage multiplier
[Voltage Multipliers]
pete_dl
June 04, 2024, 08:08:28 PM
post Re: Want to build HV HF oscilloscope probe.
[Electronic Circuits]
Twospoons
June 03, 2024, 11:13:26 PM
post Re: First DRSSTC questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
June 03, 2024, 10:35:57 PM
post Re: First DRSSTC questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Hi-Deff
June 03, 2024, 05:51:05 PM
post Re: Want to build HV HF oscilloscope probe.
[Electronic Circuits]
Domo
June 03, 2024, 07:41:41 AM
post Re: First DRSSTC questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
June 03, 2024, 05:28:44 AM
post Re: RDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
June 03, 2024, 05:02:19 AM
post Re: First DRSSTC questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
June 03, 2024, 03:47:33 AM
post Re: First DRSSTC questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
June 03, 2024, 02:23:58 AM
post Re: First DRSSTC questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Hi-Deff
June 03, 2024, 01:25:24 AM
post Re: RDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ZakW
June 03, 2024, 01:08:47 AM
post Re: RDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
June 02, 2024, 10:29:02 PM
post Re: Steve Ward SSTC5 build
[Solid State Tesla Coils (SSTC)]
Michelle_
June 02, 2024, 10:02:45 PM
post Re: Racing sparks
[Spark Gap Tesla Coils (SGTC)]
davekni
June 02, 2024, 08:25:37 PM
post Re: Steve Ward SSTC5 build
[Solid State Tesla Coils (SSTC)]
Michelle_
June 02, 2024, 04:51:58 PM
post Re: RDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Michelle_
June 02, 2024, 04:44:30 PM
post Re: My completed 14-stage Cockroft-Walton voltage multiplier
[Voltage Multipliers]
MRMILSTAR
June 02, 2024, 03:25:11 PM
post APC Smart-UPS 1500VA Teardown
[Electronic Circuits]
Mads Barnkob
June 02, 2024, 01:36:11 PM
post Re: My completed 14-stage Cockroft-Walton voltage multiplier
[Voltage Multipliers]
pete_dl
June 02, 2024, 11:43:40 AM
post Re: RDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ZakW
June 02, 2024, 08:49:11 AM
post Re: RDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
June 02, 2024, 08:36:07 AM
post Re: RDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ZakW
June 02, 2024, 12:41:50 AM
post Re: Steve Ward SSTC5 build
[Solid State Tesla Coils (SSTC)]
Benjamin Lockhart
June 01, 2024, 08:24:35 PM
post Pearson current monitor model 1330 teardown (100kA)
[Laboratories, Equipment and Tools]
Mads Barnkob
June 01, 2024, 08:22:28 PM
post Re: Steve Ward SSTC5 build
[Solid State Tesla Coils (SSTC)]
Michelle_
June 01, 2024, 03:56:53 AM
post Re: Racing sparks
[Spark Gap Tesla Coils (SGTC)]
Terry
June 01, 2024, 12:03:50 AM
post Re: First DRSSTC questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Hi-Deff
May 31, 2024, 11:46:20 PM
post Re: Steve Ward SSTC5 build
[Solid State Tesla Coils (SSTC)]
Michelle_
May 31, 2024, 06:13:59 PM
post Re: First DRSSTC questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
May 31, 2024, 01:55:22 AM
post Re: First DRSSTC questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
May 30, 2024, 11:57:49 PM
post Re: First DRSSTC questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
May 30, 2024, 11:50:06 PM
post First DRSSTC questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Hi-Deff
May 30, 2024, 11:23:35 PM
post Re: Steve Ward SSTC5 build
[Solid State Tesla Coils (SSTC)]
davekni
May 30, 2024, 10:43:06 PM
post Re: Benjamin's DRSSTC3
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
May 30, 2024, 10:24:35 PM
post Re: SSTC tripping circuit breaker
[Solid State Tesla Coils (SSTC)]
NyaaX_X
May 30, 2024, 06:10:04 PM
post Re: SSTC tripping circuit breaker
[Solid State Tesla Coils (SSTC)]
Simranjit
May 30, 2024, 04:56:11 PM
post Re: SSTC tripping circuit breaker
[Solid State Tesla Coils (SSTC)]
Michelle_
May 30, 2024, 04:48:05 PM
post Re: Steve Ward SSTC5 build
[Solid State Tesla Coils (SSTC)]
Michelle_
May 30, 2024, 04:37:22 PM
post Re: SSTC tripping circuit breaker
[Solid State Tesla Coils (SSTC)]
klugesmith
May 30, 2024, 04:16:31 PM
post Re: SSTC tripping circuit breaker
[Solid State Tesla Coils (SSTC)]
NyaaX_X
May 30, 2024, 03:34:10 PM
post Re: SSTC tripping circuit breaker
[Solid State Tesla Coils (SSTC)]
Simranjit
May 30, 2024, 02:53:50 PM
post Re: SSTC tripping circuit breaker
[Solid State Tesla Coils (SSTC)]
NyaaX_X
May 30, 2024, 12:44:47 PM
post SSTC tripping circuit breaker
[Solid State Tesla Coils (SSTC)]
Simranjit
May 30, 2024, 07:52:56 AM
post Re: Steve Ward SSTC5 build
[Solid State Tesla Coils (SSTC)]
NyaaX_X
May 30, 2024, 07:07:53 AM
post Re: Benjamin's DRSSTC3
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
May 30, 2024, 07:04:40 AM
post Re: Steve Ward SSTC5 build
[Solid State Tesla Coils (SSTC)]
Michelle_
May 30, 2024, 05:16:50 AM
post Re: Steve Ward SSTC5 build
[Solid State Tesla Coils (SSTC)]
Michelle_
May 30, 2024, 05:08:17 AM
post Re: Steve Ward SSTC5 build
[Solid State Tesla Coils (SSTC)]
davekni
May 30, 2024, 04:29:30 AM
post Re: Benjamin's DRSSTC3
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
May 30, 2024, 03:52:36 AM
post Re: Racing sparks
[Spark Gap Tesla Coils (SGTC)]
davekni
May 30, 2024, 03:47:12 AM
post Re: Steve Ward SSTC5 build
[Solid State Tesla Coils (SSTC)]
Benjamin Lockhart
May 30, 2024, 03:41:34 AM
post Re: Steve Ward SSTC5 build
[Solid State Tesla Coils (SSTC)]
Michelle_
May 30, 2024, 03:27:28 AM
post Re: Steve Ward SSTC5 build
[Solid State Tesla Coils (SSTC)]
Michelle_
May 29, 2024, 03:55:16 PM

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