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Re: [TCML] Back again....and Tesla Magnifier Tuning

Em 01/08/2018 09:44, Greg Peters escreveu:
Bert, David, John, Daniel,

Thanks very much for your responses and thanks for the links. I have read a lot of Richard Hull’s work, he wrote a fair bit about maggies in the Colorado Springs Guide, a book I really enjoyed. Unfortunately it seems not many modern coilers share his enthusiasm for the magnifier. Whether or not this is justified is something I am hoping to figure out. I’ve also been reading some of Antonio’s work and need to just slow down a bit to digest it all (not the smartest person here).

In the meantime I have been doing some simulation to understand tuning points and obtained results I would love to have explained. It’s detailed here:


Any thoughts would be fantastic – feel free to comment on the page if you don’t want to clog everyone’s inbox.



It is difficult to draw conclusions about magnifier tuning from frequency response plots. Try to simulate transient responses, using an initial condition on the primary capacitor or a voltage step in series with it. You will see waveforms as this:
The plots show the primary, secondary, and tertiary voltages for several tuning modes of the system. The program Mrn6, available at at http://www.coe.ufrj.br/~acmq/programs/ can design the ideal system. The start point is a suitable tertiary coil with terminal. The other elements can be obtained with the theory described in http://www.coe.ufrj.br/~acmq/tesla/magnifier.html implemented in the program. The main difficulty in making a real magnifier is finding a practical way to tune the secondary system, by adjusting the capacitance across the secondary coil. A terminal in the secondary coil with adequate size can be used, a transmission line to the base of the tertiary coil, another terminal at the base of the tertiary coil, and even some form of high-voltage variable capacitor. If no tuning of the secondary system is done, the system is just a regular Tesla coil loaded with a parasitic capacitance at the union of the secondary and tertiary coils. It may have better insulation between the high-voltage terminal and the primary system than a regular two-coils system, but is not optimized. A magnifier may be less sensitive to losses in the spark gap and in the resistance of the coils, because it reduces the average current in them in the time until breakout. This can be easily simulated by adding resistances to the coils.

Antonio Carlos M. de Queiroz
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