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Tesla Coil demo         This page: original date:24 October 2000
Last revision 9 July 2008

. BRIEF TESLA COIL TUTORIAL

Charles A. Hobson  BA,  BSc(hons)

Science Stuff      Tesla Coil demo                

The Tesla Coil is a tuned radio frequency transformer. The primary circuit of the RF transformer, T2 and Cp, is resonant to the same frequency as the secondary circuit, T2 and Ct (Terminal virtual capacitance). During operation The primary and secondary circuits oscillate near their resonant frequencies. Energy needed for oscillation is supplied by T1. It delivers approximately 10kV ac to the RF transformer primary circuit via two RF chokes, L1 and L2. These chokes prevent RF from getting back into T1 and the ac input voltage source.

Alternating current flows in and out of Cp charging and discharging the capacitor in both positive and negative directions at the line frequency rate of 50Hz. (60Hz U. S.).    When the capacitor is charged at the peak ac voltage, it  will have stored maximum electrostatic energy. This happens    twice an ac cycle or 100 times a second.t flows in and out of Cp charging and discharging the capacitor in both positive and negative directions at the line frequency rate of 50Hz. (60Hz U. S.).When the capacitor is charged at the peak ac voltage, it will have stored maximum electrostatic energy. This happens twice an ac cycle or 100 times a second.

 

 

The Spark Gap (s. g.) behaves as a voltage controlled switch. In the passive state it is open and Cp follows the input ac voltage as described above. When the gap arcs across, it behaves as a short circuit connecting Cp directly across T2 primary winding. The Spark Gap is normally adjusted to arc over when the voltage on Cp is just under the peak ac voltage. Thus, it arcs over twice during each ac cycle, a rate of 100 times a second.

During each Spark Gap firing, Cp and T2 primary oscillate near their natural resonant frequency. This RF energy is inductively coupled into T2 secondary where it continues to oscillate near the natural frequency of the Secondary circuit. This RF energy reaches the Terminal where it manifests itself as extremely high RF voltage and generates the sparks which Tesla Coils are famous for.

The Safety Spark Gap (S.S.G.) in the circuit is there to protect the A. C. transformer (T1) from voltage transients which could destroy it.

For further details click on the appropriate flag below.

a. Tesla Coil Theory (primary circuit)
b. Tesla Secondary Circuit
c. Tesla Coil Measurements
d. Spark Gap
e. Primary Capacitor Construction
f. Primary Coil Construction
g. Secondary Coil Construction
h. Terminal
i. Transformers
i-1 Ballasts (New)
j. Bananas
k. Chuck
L. Spark Gap Transmitter

Sites well worth visiting (Click on the
RED colours below)

Richie's Tesla Coil Site

Paul's Van de Graaff Machine

USS Worcester CL144 (My old ship)

G4RFR (Flight refuelling Radio Amateur Society)

CHUCK’S Electromagnetic Radiation Theory

CHUCK’S  Page on Space Loss and Parabolic Antennas

CHUCK’S  Page on Doppler in Space Travel

CHUCK’S Page on Electricity: A very different approach

CHUCK’S “The Nature of Electricity” pps

CHUCK’S ”In memory of GI-Joe”

CHUCK’S ”LARGE HADRON COLLIDER”

CHUCK’S   “MAGNETRON” pps

CHUCK’S   “RADAR” pps

 
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