Re: how much primary ???

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Mddeming@xxxxxxx 

In a message dated 7/2/06 11:06:00 A.M. Eastern Daylight Time, 
tesla@xxxxxxxxxx writes:

The coil is:-

12 1/2" by 61" using 18AWG wire with a 6" by 28" top load the
frequency is 64.73 KHz
I`m using 0.02 uF of primary cap.

So how much inductance do I need on the primary to get the system to tune.

I`v used a few PC programs but the figures are out of there range.

HELP

Cheers Mike Tucknott

HI Mike,

    Quick and dirty:

L1*C1=L2*C2

f=1/sqrt(L1*C1) = 1/sqrt(L2*C2)

f^2=1/(L1*C1)

C1*f^2=1/L1

L1=1/(C1*f^2)

This gets you reasonably close to where you will start tuning.

Matt D.