# JavaScript Tesla Coil Calculator Page

This is the original Javascript Calculator program written by Jerry Gore in 1997.
It is useful for stand-alone equations.

Coil design has come a long way since. For a complete Online program, I highly recommend J A V A T C.

Index of Equations

# Transformer Impedence Calculator

 TransformerVolts TransformerMilliamps Impedence Resonant Capacitorin Mfd
Enter your Transformer Volts and Milliamps to get the Capacitor value needed for your coil.
Example: I would enter 9000 volts and 45 milliamps for my neon sign transformer.
Note: If you used two transformers then simply double the milliamps (not volts), etc...
also to convert Amps to Millamps multiply by 1000 (.045 Amps = 45 Milliamps).
Warning: Assumes 60 Cycles (The cycle rate of common household current in the U.S.A.)

# Reactance of Capacitor Calculator

 Frequency of Secondary Coilin Kilohertz Reactance Inductance Needed for Primary Coil in Microhenries
Enter the Frequency of your Secondary Coil to get the Inductance needed for your Primary Coil.
Example: I would enter 190 as my secondary frequency in kilohertz.
Note: To convert megahertz to kilohertz multiply by 1000 (0.190 Mhz = 190.0 Khz).
Warning: Capacitor value is taken from equation One!

# Length of Wire AND Frequency of Coil

 Frequency of Coilin Kilohertz Length of Wirein Feet
Enter the desired Frequency OR Length of wire and get the other.
Example: I entered 1295 for length of wire and found that my coil runs at about 190 kilohertz.

# Flat Spiral Pancake Primary

 (A) Average Radiusin Inches (W) Width of Coilin Inches Number of Turnsin the Winding Inductancein Microhenries

Enter :
(A) the Average Radius as measured from the central axis to the middle of the winding,
(W) the Width of the coil,
and the Number of Turns to get the Inductance of your Flat Spiral Pancake Primary Coil.

# Number of Turns for Helical Primary

 Inductancein Microhenries Radiusin Inches Heightin Inches Number of Turns Needed
Enter your desired Inductance in Microhenries, Radius (from center axis to edge), and Height to
get the number of turns needed for your Helical Primary.

# Plate Type or Rolled Capacitors

The capacitance value identifies a plate capacitor.
For rolled capacitors, multiply the capacitance by 2.
 Dielectric ConstantK Area of Platein Inches Distance Between Platesin Inches Number of Plates Capacitancein Microfarads
Enter:
1) Dielectric constant (K) of the material used (Glass = 4 to 10, Polyethlene = 2 to 2.3 depending on purity).
2) The Area of a single plate (width times height).
3) Distance between plates (thickness of the glass, etc...).
4) The number of plates used in the capacitor.
This will give you the capacitance of your Plate Type capacitor. Multiply result by 2 for a rolled capacitor.

# Jar or Bottle Type Capacitors

 Dielectric ConstantK Jar Radiusin Inches Height of JarPortion Usedin Inches Thickness of Jar Wallin Inches Capacitancein Microfarads
Enter:
1) Dielectric constant (K) of the material used (Glass = 4 to 10 ).
2) The Jar Radius (center axis to edge of jar).
3) Jar Height that is actually used (the height of the salt water in the jar).
4) The Jar Thickness (the thickness of the glass used).
This will give you the capacitance of a single Jar or Bottle that makes up your capacitor.