need a 240volt- 20amp min. variac in Colorado

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "david baehr by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dfb25-at-hotmail-dot-com>


If ya know where to get one for a FAIR price, let me know ...thanks

>From: "Tesla list" 
>To: tesla-at-pupman-dot-com 
>Subject: Re: Primary and Secondary????? 
>Date: Sat, 22 Sep 2001 16:39:54 -0600 
> 
>Original poster: "by way of Terry Fritz " 
> 
>Nolan, 
> The main thing is to try to get very close to 'critical' coupling. If you 
>tune your coil in an undercoupled state, then your primary and secondary 
>circuits tune at the same frequency. You then can increase the coupling until 
>you reach critical coupling, which transfers the maximum energy to the 
>secondary. 
> If your primary and secondary are overcoupled, the maximum transfer of energy

>occurs only if you detune your primary(there exists two frequencies - one
above 
>and one below the res. freq of the secondary and equally offset). This is 
>often referred to as the 'camel hump' due to the shape of the graph of power 
>transfer vs. frequency. 
> The real problem with overcoupling is that now you have two different 
>frequencies working which will create constructive/destructive interference 
>patterns. The obvious visual effect of this is the racing sparks along the 
>secondary coil and possibly arcing between the primary and secondary. The 
>interference patterns cause point of high voltage to appear at spot below the 
>top of the coil and thus the racing sparks. 
>Mike 
> 
> 
> 


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