From: Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Sunday, September 21, 1997 3:17 PM
Subject: Re: STUPID SIMULATIONS
Does your program calculate output voltage? What does it
say about a primary with the same inductance and capacitance as the
> From: John H. Couture[SMTP:couturejh-at-worldnet.att-dot-net]
> Sent: Friday, September 19, 1997 6:55 PM
> To: Tesla List
> Subject: Re: STUPID SIMULATIONS
> I understand that you have not had much luck with computer programs that
> simulate electronic circuits such as the Tesla coil circuit. The reason for
> this is because these programs are based only on theory and have limited use
> for Tesla coils. Because of the complex nature of TC operation, a program to
> accurately simulate the TC must be based on both theory and on empirical
> data from dozens of real world coils. A program of this type is capable of
> producing outputs that are about 3% to 15% of the real world and will
> "closely mimic real world behavior". This can be verified by real world
> tests. Keep in mind that computer programs cannot give precise values.
> When properly used the JHCTES Ver 2.3 TC computer program not only can
> produce these accuracies but can also keep the TC system in tune when
> changes are made and produces a "DARN good model". This is an excellent
> teaching tool for students because it allows the student to design many
> types of coils without having to build them and then possibly have to make
> costly changes. Of course, when a design is decided upon the coil would then
> have to be built and tested to learn about the finer points of TC
> adjustments and operation.
> Even advanced coilers can benefit from the program. For example, what
> happens to the K factor and other 33 output parameters of the TC when the
> secondary coil diameter is changed ? No coiler can answer these questions
> quickly if at all. The JHCTES gives the answers in a fraction of a second.
> It tells you what will happen based on data from real coils. It should be
> noted that to get accurate results it is a big help if the program user has
> some knowledge of TC theory and takes the time to study the program's
> The JHCTES program coordinates 46 of the major TC parameters and in
> addition keeps the TC system in tune when changes are made. The program is
> for classical coils only because magnifiers, tube, solid state, etc, coils
> are still in the experimental stage.
> If you would like me to send you a JHCTES printout of a coil you have
> built and tested, send me the details of the coil and tests. Note that the
> more details the more accurate the results. Also, the inputs musts be
> accurate because small inaccuracies in the inputs can lead to large
> inaccuracies in the outputs with a program of this type. This is because
> when coordinatiog 46 parameters the inaccuracies can add up quickly. The
> test data must also be accurate to have the program agree with the tests. It
> would also help if the test methods are given. This is especially true of
> the operating frequenciy which controls several of the parameters. Do not
> worry about the secondary toroid because the computer will determine the
> capacitance it is operating at from the other inputs.
> The program has been used by many coilers to design successful coils and I
> have received many compliments on its capabilities. It should be noted that
> past criticisms were for older program versions and misunderstanding of how
> the program works. For example, the program is not restricted to only a few
> primary turns and only 400 secondary turns (default values only). In fact,
> the only program restrictions are for coils that are not in tune because the
> computer does not allow the user to design a TC that is not in tune.
> If you have any questions, please let me know.
> John Couture