Re: reason for rf chokes?

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

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Larry,

See:

http://hot-streamer-dot-com/TeslaCoils/MyPapers/rcfilter/rcfilter.html

http://hot-streamer-dot-com/TeslaCoils/MyPapers/rlcfilter/rlcfilter.html

http://hot-streamer-dot-com/TeslaCoils/MyPapers/primarycircuits/pricir.html

http://hot-streamer-dot-com/TeslaCoils/MyPapers/modact/modact.html

http://hot-streamer-dot-com/TeslaCoils/MyPapers/NSTWindingStress/NSTWindingStres
s.html

http://hot-streamer-dot-com/TeslaCoils/Misc/NSTFilt.jpg

http://hot-streamer-dot-com/TeslaCoils/Misc/Filter.jpg

Maybe more than you wanted to know :o)))

Cheers,

	Terry



At 07:03 AM 8/9/2002 +0000, you wrote:
>I had an EE friend of mine interested in my coil.  when i drew up the 
>schematic (at his request), he seemed confused by the chokes I use to filter 
>the high frequency from the tank circuit.
>
>I explained that due to the skin effect, the 200khz signal causes the
>secondary windings to overheat, thus the need for the chokes.  I'm guessing 
>here, but when the tank cap dumps its charge to the primary there is voltage 
>spike that returns several times during ring down.  This spike returns to 
>the choke, which dampens the spike.  The choke is essentially transparent at 
>60hz, but highly resistive to the 200khz signal.
>
>does the voltage return or is it a current spike?
>
>i thought it would be neat to connect a scope to the hv voltage side just 
>after the choke and before the cap.  but i dont want to fry a nice scope 
>soooo how about a faraday cage around the scope and optocoupled probe? (like 
>i could pull that design out of my hat or something!)
>
>so, how far off track am i?
>
>larry.
>
>