Technical Description

The Tesla-Dial Coil (TDC) is a Pulsed Electromagnetic Field (PEMF) that has a  natural resonance and needs no tuning, the base operating frequency is fixed. The desired wave forms are obtained from a double capacitor and the peculiar resonance they generate. When high potentials are impressed on the capacitor they naturally produce a “white” noise that spreads the energy over a wide spectrum of frequencies.

The Tesla coil secondary has its own particular electrical character determined in part by the tuned length of a coiled magnet wire. Like a guitar string of a particular length, it wants to vibrate at a particular frequency. The secondary is inductively bounced by the primary coil (flat coil at bottom). The primary circuit consists of a switched high-voltage source, a capacitor, a rotary spark gap, and the primary flat coil itself. This circuit must be designed so that it vibrates at a frequency compatible with the frequency at which the secondary wants to vibrate.

The primary circuit’s frequency is determined by the frequency and voltage of the source, the capacity of the capacitor, the speed of the spark gap, and the character of the primary flat coil, determined in part by the length of its winding and it’s connecting leads.

Now when all these primary-circuit components are tuned to work in harmony with each other, and the circuit’s resulting frequency is right for bouncing the secondary in a compatible rhythmic manner, the secondary becomes at its terminal end maximally excited and develops large electrical potentials. The terminal end of the secondary has a rarefied gas bulb as its capacitance rather than a metal sphere.

Unlike the conventional iron-core step-up transformer, whose core has the effect of damping vibrations, the secondary of the TDC is relatively free to swing unchecked due to it’s air core design. Plus the secondary coil is electrically separate from the primary coil.

The pulses from the primary coil have the effect of a bouncing ball. If it’s done in a rhythmic manner the pulses race up the coil then another wave is started at the primary coil at the base causing the two waves to interact and shift direction outward in a toroidal shaped field extending a fair distance (80 ft. radius) from the coil.

The TDC, unlike other Tesla coils, is adapted to produce a low frequency AM amplitude modulation output. The TDC’s secondary coil wire length is far shorter than a standard Tesla coil and is therefore not geared to produce lightening bolts but a radio frequency field. The beneficial “noise” produced by the capacitor rides upon the carrier wave generated by the rotary spark gap.