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Thank you for the definition. Jim On 4/21/2014 10:42 AM, Carl wrote:
15 kV/m is an electric field of 15,000 volts per meter. If you are outside in a strong thunderstorm, the electric field due to charges in the cloud can get as high as 15 kV/m or even higher. If the field is this high, lightning may be imminent. If you have a Tesla coil generating 500,000 volts, the field in its immediate vicinity could be 250,000 V/m. Walking across a carpet on a winter day can generate fields in the vicinity of 1 kV/m or 1,000 V/m.---Carl -----Original Message----- From: Jim Sent: Monday, April 21, 2014 3:31 AM To: Tesla Coil Mailing List Subject: Re: [TCML] Tesla coil threat to pacemakers Please define 15kv/m ? On 4/20/2014 10:22 PM, Carl wrote:15 V/m and 3 V/m are tiny electric fields. Walk outside and you are in about 100 V/m due to the charge on the ionosphere. Are you sure you haven't dropped a k? Even 15 kV/m at that distance seems low. ---Carl -----Original Message----- From: Adam Munich Sent: Sunday, April 20, 2014 6:17 PM To: Tesla Coil Mailing List Subject: Re: [TCML] Tesla coil threat to pacemakers Bturner, For what it's worth, I have measured e-field strengths of up to 15V/m about 2 meters from my DRSSTC. I would advise caution. Regards, -Adam On Sun, Apr 20, 2014 at 8:31 PM, Jim <electrical@xxxxxxxxxxxx> wrote:I worry about my classic coil all of the time. A friend recommends putting the static spark gap only in a faraday cage (like metal screening). He believes the spark gap is the only culprit. On 4/20/2014 3:02 PM, Kuba Anglin wrote:Hey, I recently finished my first Tesla coil and am very impressed by its performance. After a couple minutes of tuning, I was looking at 3-4 foot streamers. There have been no problems with the coil so far except for the over-coupling issue, which I solved. The Tesla coil is now no secret to my immediate or extended family, and I have many requests for demonstrations. Especially from my grandmother who is very impressed with me and my brother's work (I worked on this project with my twin brother). However, she has a pacemaker, and I have explainedto her that the inductance field produced by the Tesla coil will damageany nearby electronics including pacemakers. I did some reading and for my Tesla coil, 20 feet is a safe distance. Interestingly, I had my phone in my pocket (samsung s4) during my first few runs and it works perfectly even though it had been within fluorescent tube igniting range for at least 20 seconds. Before I built my Tesla coil, I had nearly 4 months of research behind me. I made sure I had a very good understanding of every component and its use before I bought one piece. I have never taken a physics class as I am currently a 16 year old high school sophomore taking AP chemistry, but I feel as though I may not need to at this point (don't worry, I will take physics next year and AP physics the year after as I have heard that the curricula are different). That said, I have done extensive research on all aspects of how and why a Tesla coil works. The only problem is that anyone who sees the Tesla coil makes assumptions. The ignorance I have experienced from others has become infuriating. This is why I would finally like to settle this. *What is a safe distance to stand from my Tesla coil if the person in subject has a pacemaker?* Please include your education and/or experience. Any other unrelated comment or questions are also welcome. I have all information regarding my Tesla coil below: *Video:* https://www.youtube.com/watch?v=Y1jNe0FIZ8g&feature=youtu.be *Image:* http://s30.postimg.org/9d1txzls1/Tesla_Pic.jpg *Parts:* 12KV 60mA Transformer (input 120V 60Hz) 28 (14X2) .15uF 2KV Capacitors 28 Resistors Tungsten Spark Gap Brass Safety Gap 1/4" 11 Turns Copper Primary 1/2" Strike Rail 4" PVC Pipe 2' Secondary 26 AWG Magnet Wire 1200 Turns 13"X4" Aluminum Spun Toroid Thank You, Kuba Anglin _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla-- _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla
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