Re: DC Tesla Coil

From: 	Greg Leyh[SMTP:lod-at-pacbell-dot-net]
Sent: 	Sunday, January 04, 1998 4:55 AM
To: 	Tesla List
Subject: 	Re: DC Tesla Coil

Alfred C. Erpel wrote:

> 1) It seems that maximum power will resonate thru a tank circuit when the
> potential energy storage of the capacitor equals the potential energy
> storage of the inductor. i.e. when .5CV^2 = .5LI^2
> Is this true?

The reactive power in any tank circuit is given by Ec x Fres,
and the circuit will resonate only at that reactive power level.
Ec will _always_ equal El at resonance by definition, regardless 
of the component values or frequency.

> If so, then to resonate at 100,000 hz would require a capacitor of
> .000001591 F and a primary of .000001591 H. This primary inductance value
> does not appear to be practical in a tesla coil.

You are assuming that 1 ohm is the optimum surge impedance 
for the tank circuit here.  In reality, Zsurge should be
about 30 to 50 times higher than the Rgap, in order to
obtain good performance.