This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.
Messages - davekni
1
« on: May 13, 2024, 05:02:46 AM »
Actually, I do have apply a Sch diode SS34-1n5822 at that p-mos placing. Did you replace both PMOS devices? The ripple voltage on that E-cap change from 150mV-->~137mV. What current did you calculate from that ripple voltage?
2
« on: May 12, 2024, 10:56:53 PM »
Look back at reply 1 from Twospoons and first paragraph of reply 3 (mine), considering that ceramic caps are ~2uF rather than 22uF. There is little value in providing more advice until you try the good advice already provided.
3
« on: May 10, 2024, 01:39:53 AM »
Murata have a useful tool for this stuff https://ds.murata.co.jp/simsurfing/index.html?lcid=en-us Yes, nice tools from some of the larger suppliers. Also your 25V MLCC caps running at 15V will be at about 40% of rated value. I've seen much worse even from reputable suppliers. Just looked at that tool for 22uF 25V X5S parts. Only one showed up: GRM188C61E226ME01. It drops to 10% of rated value by 15V.
4
« on: May 09, 2024, 03:56:52 AM »
Likely several issues. Wire loop for current measurement probably alters circuit operation. Current probes are likely to be susceptible to fields from wireless charging coil. Usually best to measure voltage and calculate current based on capacitor impedance (C and ESR). Typical ESR for new electrolytic caps is about half of worst-case specification. Measuring voltage accurately also requires good technique. Use small-diameter coax or twisted pair soldered to bypass capacitor. Connect to scope (or scope probe) only once far from charging coil.
At 256kHz ripple current should be mostly in ceramic caps. Bulk (electrolytic) cap is mostly for loop stability and to handle load transients. I'd guess your ceramic caps aren't very good at operating voltage. Many drop by 90% of rated capacitance at rated DC voltage. Some large suppliers such as Murata and TDK publish at least typical curves for their ceramic caps. Takes work searching, but find caps that are good at your use voltage.
Circuit layout could also be contributing to excess ripple.
Run LTSpice simulation. If ripple voltage is far from simulated value, then look for PFET cross-conduction or other such issues.
5
« on: May 06, 2024, 02:57:19 AM »
Alan,
Certainly could be any such possibility. My only glass glowing experience was in college and shortly after, in other words, decades ago. Was going mostly on the one image which looks like cracked glass.
6
« on: May 05, 2024, 10:10:11 PM »
So it's possible to burn holes through borosilicate glass with a tesla coil: PSA be careful Bummer about your xenon tube especially. I'd guess this is thermal expansion cracking from concentrated local heating. Even the best glass can't handle extreme temperature gradients.
7
« on: May 05, 2024, 03:05:44 AM »
I'm looking at what kind of core material for the GDT but I haven't found much relevant information or they are hidden somewhere in there. How do I determine the size of the core, and how do I select its material. Can MnZn or NiZn be used or must it have a permeability that adjusts to the operating frequency of the TC? https://highvoltageforum.net/index.php?topic=1854.msg13949#msg13949NiZn is rarely used below 1MHz due to higher loss. Advantage for some cases is it's an electrical insulator at room temperature. (But not when hot.) Also, the igbt that I plan to use is the IXGR50N60BD1, which has a gate voltage of +-20V. Can it be operated at 20v or should I be a little lower, like 18v? +-24V is fine if you want to push current. 20V limit is for high reliability under continuous use for years. TCs typically operate for a few hours total ever. Looks like an obsolete IGBT part. Is it fast enough for 300-400kHz even with ZCS operation? (And parts from EBay etc. are often counterfeit, so may be slower or not be robust at rated current.)
8
« on: May 05, 2024, 02:54:42 AM »
Disclaimer: I know aesthetically this will not be to everyone's tastes Looks really great to me. Much nicer than any of my projects. With initial tuning in daylight I'm getting 12" (30cm)+ sparks which I think is not bad for a 120W spark gap tesla coil built by a noob Yes, I'd say that is good performance. I'm wondering if the toroid is too small because sparks are coming out of the sides even with a breakout point. Yes, a larger toroid would most likely improve performance. Of course, that lowers secondary frequency, so primary needs to be tuned lower to match.
9
« on: May 05, 2024, 12:26:38 AM »
Most voltage spiking is caused by parasitic inductance. The most important two ways to minimize chance of spike damage are: 1) Use IGBTs well below specified maximum Vce. Most IGBT parameters such as switching energy are specified at half of max Vce. That's a typical operating condition. Thus if you are using 230Vac input into bridge rectifier, Vbus will be 325V. IGBTs rated for 650Vce max would be a good choice. 600V IGBTs may be fine if second condition is met: 2) Minimize interconnect inductance of bridge. Inductance internal to IGBT packages can't be eliminated. Most external inductance can be minimized. Here's my tutorial showing one good half-bridge layout (and full-bridge farther down in thread): https://highvoltageforum.net/index.php?topic=1324.msg9795#msg9795Many designs have no additional components for Vce spike protection. (Vge clamping with smaller 500W or 600W TVS diodes is still recommended, with TVS diodes soldered close to IGBT G and E terminals.) There are some cases on this forum where TVS diodes failed first, then failed diode destroyed IGBT. TVS diodes usually fail to shorted, so overload opposite IGBT. IGBTs sometimes handle more transient power than do TVS diodes. TVS diodes and RCD snubbers help only if their interconnect inductance is lower or at least similar to that of bridge interconnect. That's why it is usually better to just lower bridge inductance. R+C snubbers can reduce spikes further if inductance can't be reduced enough. But R+C snubbers dissipate more power in general. TVS diode capacitance is low enough that it will have no significant impact on coil performance (in case you decide to use TVS diodes on Vce). Being your first coil, I'd also suggest: https://highvoltageforum.net/index.php?topic=2191.msg16147#msg16147Good cooling is important for IGBT survival. For even better cooling, you could consider adding heat spreader plates below IGBTs or electrically-live heat sinks. And good thermal past for whatever configuration you use.
10
« on: May 04, 2024, 08:56:27 PM »
Yes, the ringing is on Vge. I did attach scope shots, but I guess since they were not included in the post itself they were hard to see. Here they are again, the first with normal operation (signal generator) and the second with freewheeling: Now I see those plots in your previous post. For some reason only the top of your three images showed up the first time I read your earlier post. Looks like ringing of UD+ output coupling capacitors with GDT parallel inductance. Presuming UD+ output looks like that of UD2.7, there is a coupling capacitor paralleled by another capacitor with resistor in series. Adjusting R/C values to be critically damped with your GDT inductance will make ringing die down faster. Larger capacitors will reduce ring amplitude. However, as you said, ring is small enough as is. No fixing is necessary.
11
« on: May 02, 2024, 05:18:56 AM »
But with the current IGBTs I'm pretty sure that these are just some local guy stripping some inverters or something and making a bit of money. I got a bunch of random 100A, 150A and also some 75A and 200A modules from him that still had the old gate circuitry on them. Does sound likely to be genuine given old gate drive circuitry etc. I have purchased counterfeit IGBTs of TO247 variety from EBay (and gotten refunds after proving data sheet spec's weren't met). Your situation sounds different enough. There should be no issues with the matching transformer - at 43.5kHz and 7 turns I get a flux density of 314mT, which still leaves me with a fair amount of head room given a maximum flux density of 380mT for the K4000 material. At the time of failure I used twice the amount of turns, so saturation should be pretty much impossible. Probably not, but I don't know enough about UD+ to be certain. Controlling by secondary current leaves the possibility of sub-harmonic component that builds up excess current due to resonance of primary coupling capacitor set with transformer inductance. Might be safer to control by primary current. What I noticed was that on the bus caps, one screw turned out to be loose (on the connection between the two series caps). There was still contact however, and I do not think that lacking a bus cap would lead to my bridge exploding randomly after a day of testing anyway. Hard to say when some jarring or magnetically induced force from current may have made momentary disconnects. I'd inspect that connection for any subtle signs of arcing - black residue or pitting. Loose power connections are often problematic. I did notice a strange kind of ringing however, both in normal operation and in freewheeling mode (tested with signal generator / scope). Where does that come from, and is it dangerous? The dip in the middle is not really that deep and looking at the data sheet, the IGBT only starts conducting at 6V so that amount of ringing should not pose much of an issue yet. Nevertheless I want to get rid of it of course, any tips? I'm guessing this is Vge ringing. Not specified. If so, scope images are needed to make any useful recommendations. As I was writing this I remembered that when I was checking gate wave forms sometime earlier, I managed to produce a ground loop from one emitter through my scope lead, popping the breaker (I forgot to remove the scope lead when switching from the isolation transformer to regular mains). I am pretty sure this happened to be the same IGBT that is now shorted, could that have damaged the gate somehow? This would be first guess as to a cause. Presuming scope ground was connected to smaller Kelvin emitter pin (pin paired with gate pin), resistance of that path might be high enough to fry something with momentary fault current. (Second guess is above loose power connection.) BTW, I made the almost-same mistake once too, forgetting to remove scope ground when switching from isolated to line power. Wasn't on gate return, so didn't fry anything. Was a bit surprised that scope and probe both survived too. And last of all, the ebay seller I got these from did not take any measures against ESD and just packed them into refrigerating plastic bags, maybe I was unlucky and the gate got slightly damaged? Poor packaging, but not likely the issue. I have seen latent failures due to prior partial damage from ESD, but not specifically in IGBTs or power FETs. Hope your repair and future work goes smoothly.
12
« on: April 30, 2024, 04:31:01 AM »
I don't really have a good way to measure the spikes at full bus voltage but I can still guess at how big they will be. Can you run your interrupter at 60Hz? Or even better, sync it to line voltage? Then you can measure spikes. Connect scope probe ground lead through a small cap such as 0.1uF to bus voltage. Cap will provide an AC ground for spike frequencies while passing reasonably-low current at line frequency.
13
« on: April 30, 2024, 04:25:55 AM »
Or should I just put a box fan next to the primary I did try running compressed air into the inside turn but it did almost nothing. Haven't tried compressed air, but it would be difficult to get enough air flow to be effective. I did add a pair of 120mm fans blowing up at my DRSSTC primary from opposite sides. Definitely helps, though probably not as much as water cooling would. Might be sufficient if your mechanical design allows for air flow from below primary. I added copper shielding over fan motors and initial bit of lead wiring to prevent internal motor electronics from getting confused by primary magnetic field. (My primary is litz wire, so no reasonable water cooling option.)
14
« on: April 24, 2024, 05:58:27 AM »
So I wanted to ask what is usually better? Running at the upper pole or the lower pole? QCW coils usually run at upper pole frequency. Normal DRSSTCs are a bit more complex to describe. Upper and lower pole frequencies describe steady state. For short enable pulses, DRSSTCs don't reach steady state. Currents are amplitude-modulated as energy sloshes back and forth between primary and secondary, a mix of upper and lower pole frequencies. For long on times (typically for higher impedance coils), operation will settle to one pole. Though that pole can change as arc loading changes secondary frequency. Once secondary frequency drops below primary, operation changes to upper pole for remainder of enable pulse duration. Typical DRSSTC tuning is with primary frequency below secondary (below unloaded secondary frequency). Improves performance as arc capacitance reduces secondary frequency to match primary. Matching frequencies with simulated arc loading (wire) is one way to get there. More common is to just try a specific amount of detuning such as primary 10% below secondary.
15
« on: April 21, 2024, 06:21:54 AM »
If switching spikes are caused by bus inductance dumping energy into parasitic capacitance, wouldn't the amount of overshoot decrease as bus voltage increases? There are multiple possible causes for spikes. I'd guess these are caused by diode turn-off (reverse recovery time ending) during post-zero-current switching. Diode turn-off causes sudden drop in bus current causing sudden rise in voltage due to bus inductance. This seems to me like not strong enough feedback soon enough. And reducing the CT ratio further might make it better, but I don't want to have too much past 1A of feedback current right? Depends on power rating of 51 ohm CT burden resistor in your UD2.7 build and intended duty cycle of your coil (max setting of interrupter). Yes, 1A is a reasonable number. My full bridge coil starts oscillating at much less voltage. Half bridges need twice the bus voltage to ring up at the same rate (same output voltage). Edit: One more thought: What type of diodes are you using for feedback CT input clamping (input to comparitor, D1 and D2)? If using 1N4148 or other non-schottky diodes with higher Vf, that will increase startup voltage and current required to get good phase lead. Also, what value is your comparitor hysteresis feedback capacitor (C33 in many UD2.7 schematics)? If using 2.2nF (or anything above ~1nF) that would be another contribution to increased startup voltage and phase lead current.
16
« on: April 21, 2024, 06:12:31 AM »
I have thought about using that bottle and after having the exact dimensions with a hot air gun, shrink the plastic in the secondary and if it does not reach the height, a joint would be made between the two layers with about 5 cm above the other, would it affect anything if I use this plastic? Interesting idea. If it would shrink only radially as heat-shrink tubing does, might work well for both insulation and to hold windings in place. My concern is that I think PET bottles will shrink axially too, which may or may not create a problem. I could imagine axial shrinking pulling windings out of place and creating overlap. The varnish does little to increase the insulation. The coating on the wire does that job. Depends on thickness. I'd probably agree for standard air-dry varnish. Two-part epoxy coatings can be thicker and provide useful insulation. My DRSSTC has 7 coats of epoxy about 1mm thick each. Initially had only two coats. Additional five was a big help in minimizing racing sparks along secondary.
17
« on: April 20, 2024, 10:23:28 PM »
Would that mean the coil mainly uses the counterpoise and the mains ground is just extra security, or will it transmit interference to the mains no matter what even if the capacitance of the counterpoise is significantly higher than the toroid? The larger the counterpoise is the less anything else to do with grounding matters. Modeling the electric field around a Tesla coil including all the building wiring and plumbing and construction materials is too complex to be tractable. And the location of wiring and plumbing is rarely known either. That's why there are varied simplified views and opinions. My goal for inside use is to think of the building more as a low-quality Faraday cage with random wiring and plumbing all around, all "grounded" for the purposes of TC frequencies. Of course, wire inductance makes the cage far from perfect. But most of that inductance is common-mode between hot and neutral and safety-ground. There is very little differential noise introduced. With any option, your small coil is extremely unlikely to damage any electronics, at least any devices more than a meter or two from coil. At worst it interferes with radio communication.
18
« on: April 20, 2024, 09:21:55 PM »
This is probably a stupid question but what if I use a counterpoise under the coil but also connect the counterpoise to mains ground?
Not at all a stupid question! Opinions vary widely. I always use a counterpoise under my coils and always connect them to mains ground too.
19
« on: April 20, 2024, 09:16:14 PM »
Here's the low side switch, 250V ish DC bus voltage. (200ns/div), (Vce 50V/div), (Vge 10v/div) Thank you for scope settings. These first three zoomed-in traces look excellent! Very clean switching with Vce transition occurring at turn-off and turn-on just before zero current. I also still have significant spikes up to like 500V on the first few cycles! I know this is normal but should they be this high with 250V bus? I'm planning to run 680V bus voltage (1200V IGBTs) Those spikes do look rather high, though may not be enough to damage anything. Spike voltage likely scales with current more than with voltage. Hope you get other responses and opinions too. I see a snubber cap across top brick Vbus. Is there another on the bottom brick? Presuming so, and if other opinions say those spikes are high, a few options come to mind: 1) What CT ratio do you have? If ratio can be reduced without exceeding UD2.7 feedback burden resistor (51-ohm) power, that will help. Makes UD2.7 phase lead track sooner (at lower current). 2) Adding a laminated bus bar structure to H-bridge to further reduce stray inductance and allow connection of additional snubber caps. 3) Add R+C snubbers on brick outputs. 4) Make the self-oscillating mod's to UD2.7 driver that I've described in other treads and a couple people have implemented. When self-oscillation is set to roughly primary frequency, phase lead starts almost immediately. If you are interested in this option I can find those threads and add links. If I zoom in on the bridge output ringing on the first cycle, it's about 25MHz. Is this just from bus inductance, or could it be an artifact of poor measuring? The higher frequency ring is less important and is likely very sensitive to measurement details. The more important frequency is width of each spike, which looks to be just under 1us, say 900ns. That half-cycle spike is ~550kHz and not so likely to be a measurement artifact. It is likely due to inductance, internal to bricks and snubber caps and external connections between bricks and caps.
20
« on: April 19, 2024, 03:09:29 AM »
Looks nice from the datasheet! Running a few calculations based of times I think you don't want to push the speed to much, I got 200Khz. It is not worthy it says it's optimized for hard switching. A drsstc soft switches so you might not get as much benefit from that. I've never tried the transistor so I cannot say for sure. Still seems real nice! I've not used this IGBT myself either, but expect it is capable of more than 200kHz with proper drive and H-bridge layout. The key "slow" number is turn-off delay. However, this is with 0-15Vge and 10 ohms gate resistance. With +-15Vge or +-20Vge and typical diodes in gate drive to reduce turn-off gate resistance, turn-off will be MUCH faster. That fast turn-off leads to need for low parasitic H-bridge inductance. Even 13nH of IGBT leads can be problematic as I showed in previously linked thread. IGBT turn-off at low current (just before zero) will help reduce spikes too since inductance can't be eliminated. If spikes are still problematic, R+C snubbing on H-bridge (on IGBT C-E) will help further.
Recent Topics and Posts
|
Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
|
Michelle_ Today at 05:55:24 AM
|
|
Re: Weird AC/DC mini SSTC build review
[Solid State Tesla Coils (SSTC)]
|
Michelle_ Today at 05:44:12 AM
|
|
Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
|
MRMILSTAR Today at 05:11:54 AM
|
|
Re: Help with primary voltages of unknown transformer
[Transformer (Ferrite Core)]
|
alan sailer May 13, 2024, 11:44:56 PM
|
|
Re: Help with primary voltages of unknown transformer
[Transformer (Ferrite Core)]
|
Domo May 13, 2024, 10:28:34 PM
|
|
Re: Help with primary voltages of unknown transformer
[Transformer (Ferrite Core)]
|
alan sailer May 13, 2024, 10:20:19 PM
|
|
Re: Help with primary voltages of unknown transformer
[Transformer (Ferrite Core)]
|
Domo May 13, 2024, 09:27:58 PM
|
|
Re: Help with primary voltages of unknown transformer
[Transformer (Ferrite Core)]
|
alan sailer May 13, 2024, 09:06:59 PM
|
|
Help with primary voltages of unknown transformer
[Transformer (Ferrite Core)]
|
Domo May 13, 2024, 08:43:49 PM
|
|
Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
|
Benjamin Lockhart May 13, 2024, 07:25:29 PM
|
|
Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
|
OmGigaTron May 13, 2024, 06:50:59 PM
|
|
Re: Weird AC/DC mini SSTC build review
[Solid State Tesla Coils (SSTC)]
|
Michelle_ May 13, 2024, 03:47:08 PM
|
|
Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
|
Michelle_ May 13, 2024, 03:42:58 PM
|
|
Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
|
NyaaX_X May 13, 2024, 07:09:16 AM
|
|
Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
|
davekni May 13, 2024, 05:02:46 AM
|
|
Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
|
NyaaX_X May 13, 2024, 02:25:25 AM
|
|
Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
|
alan sailer May 13, 2024, 01:39:11 AM
|
|
Re: Plasma Toroid
[Solid State Tesla Coils (SSTC)]
|
alan sailer May 13, 2024, 01:33:21 AM
|
|
Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
|
davekni May 12, 2024, 10:56:53 PM
|
|
Re: Quick question about steve ward mini SST5 resonant frequency
[Solid State Tesla Coils (SSTC)]
|
NyaaX_X May 12, 2024, 05:10:40 PM
|
|
Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
|
Michelle_ May 12, 2024, 04:24:44 PM
|
|
Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
|
alan sailer May 12, 2024, 04:10:54 PM
|
|
Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
|
Michelle_ May 12, 2024, 04:04:11 PM
|
|
Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
|
hal7rr May 12, 2024, 03:56:57 PM
|
|
Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
|
Michelle_ May 12, 2024, 03:46:45 PM
|
|
Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
|
hal7rr May 12, 2024, 02:59:16 PM
|
|
Re: Quick question about steve ward mini SST5 resonant frequency
[Solid State Tesla Coils (SSTC)]
|
Michelle_ May 12, 2024, 02:51:27 PM
|
|
Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
|
Michelle_ May 12, 2024, 02:49:42 PM
|
|
Re: Quick question about steve ward mini SST5 resonant frequency
[Solid State Tesla Coils (SSTC)]
|
ZakW May 12, 2024, 08:34:39 AM
|
|
Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
|
ZakW May 12, 2024, 08:30:29 AM
|
|
Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
|
Michelle_ May 12, 2024, 02:35:17 AM
|
|
Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
|
alan sailer May 12, 2024, 02:07:32 AM
|
|
Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
|
Michelle_ May 11, 2024, 09:55:59 PM
|
|
Re: Help with LabCoatz's Staccato QCW DRSSTC
[Beginners]
|
NyaaX_X May 11, 2024, 06:16:22 PM
|
|
Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
|
hal7rr May 11, 2024, 05:24:34 PM
|
|
Re: Type 77 Metglas Laced Ferrite Core
[General Chat]
|
NyaaX_X May 11, 2024, 10:39:24 AM
|
|
Re: Type 77 Metglas Laced Ferrite Core
[General Chat]
|
Mads Barnkob May 11, 2024, 07:02:20 AM
|
|
Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
|
NyaaX_X May 11, 2024, 06:40:50 AM
|
|
Type 77 Metglas Laced Ferrite Core
[General Chat]
|
paulp1776 May 11, 2024, 06:23:59 AM
|
|
Re: Weird AC/DC mini SSTC build review
[Solid State Tesla Coils (SSTC)]
|
Michelle_ May 11, 2024, 05:27:22 AM
|
|
Re: Quick question about steve ward mini SST5 resonant frequency
[Solid State Tesla Coils (SSTC)]
|
alan sailer May 11, 2024, 01:37:37 AM
|
|
Re: designing and building electron gun help!
[General Chat]
|
Twospoons May 11, 2024, 12:10:44 AM
|
|
designing and building electron gun help!
[General Chat]
|
Luca c. May 10, 2024, 09:38:05 PM
|
|
Re: Quick question about steve ward mini SST5 resonant frequency
[Solid State Tesla Coils (SSTC)]
|
Michelle_ May 10, 2024, 09:24:21 PM
|
|
Re: Quick question about steve ward mini SST5 resonant frequency
[Solid State Tesla Coils (SSTC)]
|
alan sailer May 10, 2024, 08:43:11 PM
|
|
Quick question about steve ward mini SST5 resonant frequency
[Solid State Tesla Coils (SSTC)]
|
Michelle_ May 10, 2024, 08:33:47 PM
|
|
Weird AC/DC mini SSTC build review
[Solid State Tesla Coils (SSTC)]
|
Michelle_ May 10, 2024, 05:34:15 AM
|
|
Re: Question about using mains power and variacs to power this circuit
[Beginners]
|
Michelle_ May 10, 2024, 05:08:38 AM
|
|
Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
|
Twospoons May 10, 2024, 03:02:13 AM
|
|
Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
|
davekni May 10, 2024, 01:39:53 AM
|
|
Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
|
Twospoons May 10, 2024, 12:06:50 AM
|
|
Re: Question about using mains power and variacs to power this circuit
[Beginners]
|
klugesmith May 09, 2024, 07:10:19 PM
|
|
Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
|
klugesmith May 09, 2024, 06:59:22 PM
|
|
Re: Question about using mains power and variacs to power this circuit
[Beginners]
|
Michelle_ May 09, 2024, 03:42:49 PM
|
|
Re: Question about using mains power and variacs to power this circuit
[Beginners]
|
Michelle_ May 09, 2024, 03:06:19 PM
|
|
Re: Question about using mains power and variacs to power this circuit
[Beginners]
|
Mads Barnkob May 09, 2024, 01:05:26 PM
|
|
Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
|
NyaaX_X May 09, 2024, 09:15:24 AM
|
|
Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
|
Lasr8 May 09, 2024, 04:45:33 AM
|
|
Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
|
davekni May 09, 2024, 03:56:52 AM
|
|
Re: Question about using mains power and variacs to power this circuit
[Beginners]
|
Michelle_ May 09, 2024, 02:16:30 AM
|
|
Re: Question about using mains power and variacs to power this circuit
[Beginners]
|
Michelle_ May 09, 2024, 02:00:28 AM
|
|
Re: Question about using mains power and variacs to power this circuit
[Beginners]
|
unrealcrafter2 May 09, 2024, 12:48:57 AM
|
|
Re: Capacitor Blowout
[Sell / Buy / Trade]
|
radioman May 08, 2024, 09:04:54 PM
|
|
Question about using mains power and variacs to power this circuit
[Beginners]
|
Michelle_ May 08, 2024, 08:10:41 PM
|
|
Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
|
Michelle_ May 08, 2024, 07:33:43 PM
|
|
Re: How do you measure HV current?
[Beginners]
|
unrealcrafter2 May 08, 2024, 07:33:31 PM
|
|
Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
|
NyaaX_X May 08, 2024, 01:31:28 PM
|
|
Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
|
Twospoons May 08, 2024, 06:41:48 AM
|
|
Tesla coil amplitude dies after one corona discharge.
[Solid State Tesla Coils (SSTC)]
|
Simranjit May 08, 2024, 05:42:07 AM
|
|
Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
|
Michelle_ May 07, 2024, 06:46:16 PM
|
|
What capacitor configuration to explode foil?
[Capacitor Banks]
|
FPS May 07, 2024, 03:51:32 PM
|
|
Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
|
alan sailer May 07, 2024, 03:20:23 PM
|
|
Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
|
NyaaX_X May 07, 2024, 11:00:00 AM
|
|
Aluminum electrolytic capacitor ripple current issue
[Beginners]
|
NyaaX_X May 07, 2024, 06:07:48 AM
|
|
Re: 3D printed mini-slayer: world's weakest tesla coil
[Solid State Tesla Coils (SSTC)]
|
Michelle_ May 06, 2024, 04:43:19 PM
|
|
Re: 3D printed mini-slayer: world's weakest tesla coil
[Solid State Tesla Coils (SSTC)]
|
Mads Barnkob May 06, 2024, 04:26:44 PM
|
|
Re: Feedback core for Tesla coil
[Solid State Tesla Coils (SSTC)]
|
Mads Barnkob May 06, 2024, 04:24:57 PM
|
|
Re: CM400 Induction Heater
[Electronic Circuits]
|
Anders Mikkelsen May 06, 2024, 04:20:37 PM
|
|
Feedback core for Tesla coil
[Solid State Tesla Coils (SSTC)]
|
Simranjit May 06, 2024, 04:28:59 AM
|
|
Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
|
davekni May 06, 2024, 02:57:19 AM
|
|
Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
|
alan sailer May 06, 2024, 02:07:38 AM
|
|
Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
|
Michelle_ May 05, 2024, 11:29:46 PM
|
|
Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
|
alan sailer May 05, 2024, 10:27:01 PM
|
|
Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
|
davekni May 05, 2024, 10:10:11 PM
|
|
Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
|
Michelle_ May 05, 2024, 08:06:11 PM
|
|
Re: Ferrite material for GDT SSTC/DRSSTC
[General Chat]
|
alan sailer May 05, 2024, 04:28:35 PM
|
|
Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
|
Michelle_ May 05, 2024, 06:31:32 AM
|
|
Re: Big Coil Build Log
[Dual Resonant Solid State Tesla coils (DRSSTC)]
|
flyingperson23 May 05, 2024, 05:48:43 AM
|
|
Re: Ferrite material for GDT SSTC/DRSSTC
[General Chat]
|
thedark May 05, 2024, 04:49:39 AM
|
|
Re: Ferrite material for GDT SSTC/DRSSTC
[General Chat]
|
thedark May 05, 2024, 04:28:40 AM
|
|
Re: Ferrite material for GDT SSTC/DRSSTC
[General Chat]
|
davekni May 05, 2024, 03:05:44 AM
|
|
Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
|
davekni May 05, 2024, 02:54:42 AM
|
|
Ferrite material for GDT SSTC/DRSSTC
[General Chat]
|
thedark May 05, 2024, 02:21:54 AM
|
|
Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
|
Michelle_ May 05, 2024, 01:46:25 AM
|
|
Re: TVS diode vs RCD snubber for protect IGBT peak voltage
[General Chat]
|
davekni May 05, 2024, 12:26:38 AM
|
|
Re: TVS diode vs RCD snubber for protect IGBT peak voltage
[General Chat]
|
thedark May 04, 2024, 10:48:10 PM
|
|
Re: TVS diode vs RCD snubber for protect IGBT peak voltage
[General Chat]
|
klugesmith May 04, 2024, 10:40:15 PM
|
|
TVS diode vs RCD snubber for protect IGBT peak voltage
[General Chat]
|
thedark May 04, 2024, 09:30:32 PM
|
|
Re: CM400 Induction Heater
[Electronic Circuits]
|
davekni May 04, 2024, 08:56:27 PM
|
|
Re: Big Coil Build Log
[Dual Resonant Solid State Tesla coils (DRSSTC)]
|
Benjamin Lockhart May 04, 2024, 04:25:00 AM
|
|