RE: [TCML] First (or maybe 2nd) light on my medium-sized SG coil

["Lau, Gary" <Gary.Lau@xxxxxx>]

I'm all for keeping tap leads and all tank circuit wiring as direct and tidy as possible, but doing so in the name minimizing inductance to not impede current peaks doesn't make sense to me.

Any additional inductance in tap wiring would simply be that much more inductance in the primary circuit, so tapping slightly inward on the primary inductor would compensate.  Additional inductance in wiring may not couple strongly to the secondary, so it might be referred to as off-axis inductance.  But this is not a loss and is not undesirable; it just means that the secondary may need to be lowered slightly to compensate for a very marginally lower coupling.  Off-axis inductors are sometimes used for fine tuning the primary.

Unnecessarily lengthy tank circuit wiring may result in RESISTIVE losses however, and for THAT reason should be kept as direct as possible.  Resistive losses are truly losses and cannot be compensated for.  I don't mean to nit-pick, but it's important to keep our reasoning straight.

Regards, Gary Lau
MA, USA


> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of DC Cox
> Sent: Saturday, April 19, 2008 4:28 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] First (or maybe 2nd) light on my medium-sized SG coil
>
> The tap lead should be short such that it adds only minimal inductance to
> the LC tank circuit.  Any additional inductance in the tank circuit circuit
> is undesireable as inductance always acts to impede the current max peaks,
> and we need to keep these max curents high as the magnetic field coupling
> the sec coil depends on high current to produce powerful magnetic fields
> that contain a lot of energy.
>
<snip>
>
> Safety first and happy coiling!
>
> Regards,
>
> Dr. Resonance

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