RE: variable inductor primary tuning (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 24 Jul 2007 17:41:23 -0600
From: S&JY <youngs@xxxxxxxxx>
To: 'Tesla list' <tesla@xxxxxxxxxx>
Subject: RE: variable inductor primary tuning (fwd)

Scott,

Yes, it works fine.  One method is to make two off-axis coils or spirals and
connect them in series.  Moving them closer or farther apart will change the
inductance.  Depending on how you hook them up you will either increase or
decrease the total inductance as the coils are brought closer together.
Another way is to find a surplus variable helical roller coil, or make one.
The extra coil does not waste very much energy.  But it's a lot of extra
effort - changing primary taps is not that difficult.
--Steve Y.

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx] 
Sent: Monday, July 23, 2007 8:15 AM
To: tesla@xxxxxxxxxx
Subject: variable inductor primary tuning (fwd)


---------- Forwarded message ----------
Date: Sun, 22 Jul 2007 22:10:38 -0400
From: Scott Bogard <teslas-intern@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: variable inductor primary tuning

Hey guys,
     If one was building a small TC or other resonant circuit and wanted to 
make a fixed primary (without taps) would one be able to put some kind of 
variable inductor in series with the primary coil, and vary the tuning in 
this manner?  I would assume this would not be the most efficient way, but 
does it actually work this way or not.  Thanks.
Scott Bogard.

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