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*To*: tesla@xxxxxxxxxx*Subject*: Re: how much primary ??? (correction)*From*: "Tesla list" <tesla@xxxxxxxxxx>*Date*: Sun, 02 Jul 2006 12:01:26 -0600*Delivered-to*: testla@xxxxxxxxxx*Delivered-to*: tesla@xxxxxxxxxx*Old-return-path*: <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>*Resent-date*: Sun, 2 Jul 2006 12:02:28 -0600 (MDT)*Resent-from*: tesla@xxxxxxxxxx*Resent-message-id*: <qPIUawHVDuL.A.1zF.0oAqEB@chip1>*Resent-sender*: tesla-request@xxxxxxxxxx

OOPS! Forgot my 2*Pi - Gotta stop thinking in radians/sec. Matt D. In a message dated 7/2/06 12:38:45 P.M. Eastern Daylight Time, Mddeming 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/[2*pi*sqrt(L1*C1)] = 1/[2*pi*sqrt(L2*C2)] (2*pi*f^)2=1/(L1*C1) C1*(2*pi*f)^2=1/L1 L1=1/[C1*(2*pi*f)^2] This gets you reasonably close to where you will start tuning. Matt D.

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