My TC stop producing high voltage when I grounded one of the secondary to my window frame. What went wrong here ? Is no.of winding too much ? I think window frame is connected to house neutral wire. Is that a problem ?
Brilliant video thank you. I think I have the same injury but seems to be improving after 3 weeks. Couldn't walk at first and stairs were a nightmare. I knew I did something potentially serious but just didn't want surgery so have tried everything to avoid that... can now put some weight on it but fear avoiding the hospital may leave me with some long term issues... slight limp or arthritis. No fun getting older.
Jim, at 11 months...how stiff is knee joint? I'm at week 6 and bending at 90 degrees, but having a tough time getting past that angle. Its really stiff, even with the physical therapy. Is your injury still a little stiff or has that gone away?
I should put up an update. It's a bit over a year since my injury. My range of motion is almost completely normal and getting the ROM back wasn't that hard. But functionally I'd say its at 80%. If I use my knee too much it swells.
4:24 the left circuit is almost correct, it needs air to quench the spark gap, so that the slow charging c1 capacitor is quickly discharged through the single turn L1 primary, without oscilating. As Tesla explained in his 1891 lecture. it is due to the quick unipolar change in the electrostatic field. Now you know why the right circuit is different. as it uses EM resonance in the primary, not electrostatic induction. the resonant mode in the secondary will be different!
I hate when people use it as a novelty. People who understand what it can do wouldnt disrespect tesla. Its not suppose to spark when operating properly
Thanks for the video Jim...I am 3 weeks post op for the same injury. My doc said I must be in the brace for 6 weeks with leg absolutely straight before any therapy...does that sound right? Did you mention you did therapy and bening much sooner than 6 weeks? thanks
I didn't start therapy exactly. I had my leg on that Passive Motion machine thing at about 3 weeks. I was not to use my leg muscles at all though - for 6 to 8 weeks. So no real re-hab. I think the Dr prescribed the machine because I was having a lot of swelling. I don't know if its important to work on ROM early. I have all but a couple of degrees of motion back. I can dance ok, but the knee does kind of wobble now and then. I haven't fallen but it seems possible. Also it will swell if I exercise it much. It is what it is. As you get older it's always something.
@@JimPaul0627 Thanks Jim- I am now 3 1/2 wks post op....awaiting my 6 week followup to HOPEFULLY allow adjustments in the angle from dead straight to a bend. I hv been taking it off at night to sleep- it is SOOOOO hard to sleep on my back with that thing on.
hello i started running 6 days a week,,now i have this strange feeling on my upper left knee its not painful,,i can bend my knees,if i swing my foot while sitting i can feel it sometimes maybe in 5 - 7 swings sometimes none,,is this a sign of quad injury of just a normal thing for a beginner
The bi-polar Tesla coil is a good example of lateral thinking. May I suggest a extension of lateral thinking? Suppose the primary coil were ONE single turn made of copper water pipe? (Very low inductance). So the electrolytic capacitor must be of very high capacitance. The line power supply must provide DIRECT voltage (rectified), say around 200 volts, and *always* charges the electrolytic capacitor via a series resistor. Your spark gap acts as a switch, but this should be replaced with an electronic switch. Use an IGBT (Insulated Gate Bipolar Transistor). Maybe two connected in parallel. The IGBT gate is driven by a separate digital oscillator with 1000:1 duty cycle. So the voltage across the electrolytic capacitor has a "sawtooth" waveform. And the electrolytic capacitor charges in 1 millisecond and discharges in 1 microsecond, say. The induced high voltage in the long secondary coil is proportional to the *rate-of-change* of the discharge current in the primary coil. So the induced high voltage is present for one microsecond every 1 millisecond. I have never built this, I'm just dreaming. I suspect the danger from ozone (caused by ionization) is real. Ozone is poisonous and might possibly cause cancer. Be careful.
High-capacity and low-impedance HV capacitors can get VERY expensive and inductors are very cheap, so to hit the target frequency it tends to always be better to have a larger inductor so that you can get away with a smaller capacitor. As you make the inductor bigger the current requirement also decreases, but the voltage has to increase proportionately, so you do eventually get to a point where the voltage becomes the main problem, so most designs settle on a balance in the middle since all resonant primaries will drive the secondary in the exact same way, with the difference being in cost and electrical efficiency.
Sam's right on that. Also I'd steer clear of electrolytic caps for anything other than the DC side of the supply line assuming you go for the solid state version as they tend to blow up under high frequency loading.
There are no "RULES" to building a TESLA COIL if you do not build it RIGHT then you do not get a efficient machine and tou will not get the same effect
Very cool TC brother , next try a SSTC are less dangerous and more capabilitys like controlling the arc lenght thickness durations , or even musical arcs
Nice Coil! I really like this design, and it's an inspiring build. I built a VTTC with a GU81 Soviet transmitter tube. My first coil. Vacuum tube coils are pretty quiet by the way. The streamers aren't very loud. Not much more than normal conversation. With the Staccato circuit there is more of a snap, but still pretty quiet. I am curious about trying a bipolar VTTC.
Thanks for posting this video, i had same injury 9 weeks ago and it's great listening to other people's experience. For me i noticed that from around week 7 things began to really get better. My advice would be to be patient for the first 2 months just working on range of motion, walking and working on rest of body. After 8 weeks that's when gentle strength work can begin and progression happens quickly. Also got back on my bike at 7 weeks which helped in many ways. Praying that anyone who reads this that has same injury recovers well.
Great video and impressive results. Being new to this knowledge I’m soaking up all I can. Built my first ts two months ago and now building the 9th. Started really small and growing constantly. Thanks for sharing
The two circuits are not identical. The one with the spark gap connecting the primary needs a high frequency resistant transformer. The design with the spark gap in parallel just needs a short circuit proof transformer. Also the spark gap does produce UV but Xrays no, you need at least 10kV in a vacuum to produce any kind of sort xray. The copper tubings resistance does not matter, its low resistance for 60hz yes, but its purpose is to simply charge the capacitor, once the capacitor reaches high enough voltage to short its contacts you have a a primary LC circuit. the spark gap on design two just acts to short the transformer until the next charge cycle. Ozone is indeed toxic to humans, but even for lower concentrations more toxic to smaller organisms (from what I know). The tesla coil run in short durations wont make enough ozone to murder you, but once you start feeling a bit unwell, open the window as soon as possible
@@JimPaul0627 that is the most common circuit design since its easier to find short circuit proof transformers. Note: Microwave Transformers do have shunts for short circuit protection but they are not large enough to redirect all of the magnetic flux, so you need a ballast (another inductor from a discharge lamp fixture for example) to externally limit the current on the primary side.
@@janno288 My understanding of "shunt" is that it is a short circuit. Is that the nature of a shunt in a Microwave Oven Transformer? Can one see the "shunt"?
@@JimPaul0627 It is a magnetic shunt, in MOTs it is typically two bits of steel inbetween the primary and secondary. TBH I think the original post was wrong and you need HF and short resistant transformers in both circuits, since I doubt there is much electrical difference.
As a developer from the mod this is from, looking at the rest of your channel I'm so confused what inspired you to make this video? It's really silly and I appreciate it though!
Cool. Thanks for replying. I am stuck at home recovering from a knee injury but feel I still need to produce something. I loved the weird beauty of Green Star Lake.
Jim - thanks so much for your timely video and tips. I have pretty much the same injury (left leg as well) and I'm having surgery in 2 days time. I'm 65 years old (living in Australia), recently retired and reasonably fit/strong. My wife and I had just locked in a 7 week holiday to the UK and France, when I had the fall. Our travel date is September 5 ( 9 weeks after surgery). My doctor has advised that this will be too early to travel - due to restricted movement, increased risk, access to treatment etc.... This make sense, but my wife is absolutely devastated - she's from England and her brother is not well and she hasn't see him for some years + we have other activities planned. Nothing over strenuous, I guess mainly walking. I think we've just not been prepared (emotionally) to accept that we'll have to postpone the trip (a bit of denial, I think). Obviously every recovery journey will be different, but if you were to travel at 9 weeks post-op (ie 4 weeks from date of your video) - could you see anyway that would be practical. Are you still using crutches now or fully weight bearing? How about navigating stairs - how is that working? The passive movement machine look interesting - I assume you think that is providing good benefit - look like you started using that at about 2 weeks. The shoelace reminder makes a lot of sense - I can see me doing something similar. My plan is to get an up to date assessment post surgery and maybe about 2-4 weeks in (when I can confirm surgery was successful, no infections, DVT etc) make a final call. Any advice or suggestions would be greatly appreciated. Regards, Geoff. PS: Buena suerte con tu espanol. El idioma espanol es uno de mis pasatiempos tambien.
@@JimPaul0627 Jim - thanks for the reply. My surgery went well - the tendon was completely snapped, so doctor suggest we defer any serious travel to 2024. I've just spent the day cancelling our flights, accommodation, etc, My wife will forgive me one day. Take care - I'll lookout for any more updates from you
Thank you. It does seem unlikely to fit. I just stuffed it all in the bag along with a leather coat. I took a picture but I can't post it. It is big for an airline "personal item" but I've not had a problem and I've done half a dozen flights with it. Most airlines list "briefcase" as a personal item and that is what that is. Here's a link to the bag: www.amazon.com/gp/product/B07DDDQN92/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
