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From: Kevin McMurtrie
Subject: Re: Tesla coil question
User-Agent: MT-NewsWatcher/3.2 (PPC Mac OS X)
Date: Sat, 30 Nov 2002 03:33:13 GMT
NNTP-Posting-Date: Fri, 29 Nov 2002 19:33:13 PST
In article <3DE816FC.F00A605B@NAESPAM.yahoo.com>,
>I was reading
>and a few thoughts crossed my mind.
>the Tesla coil it appears works a bit like a radio. To get a changing
>field in the
>primary simple breakdown seems to be used ie a spark gap and this
>power in the secondary. I take it that the frequency of the secondary
>on the LC of the secondary ie what the centre frequency is? Also the
>must be quite broadband for their being enough power to be picked up in
>first place but it is a spark transmitter so I suppose that explains it.
>Does anybody use an oscillator in the primary instead of a spark ie a
>frequency oscillator a bit like use in an invertor but variable
People try but it's very hard. A _LOT_ of power needs to be pumped into
a primary coil that's a short loop of copper pipe. The frequency needs
to be just right and you need plenty of shielding on the inverter. I
tried once and blew a handful of MOSFETs without making more than a few
KV on the secondary.
The nice thing about a spark is that it delivers a lot of power then
breaks the coupling to the power supply.
>Also how high in frequency can you go with this idea? Can you do
>similar with light? ( I suppose a laser is the nearest). What about a
You can make mini telsa coils but their voltage is greatly limited by
arcing. High grade xenon trigger transformers can operate like mini
tesla coils until ozone damages their insulation. They operate at a few
MHz with the core fully screwed in.
If you want high voltage microwaves, a microwave oven has the parts. It
will destroy all nearby electronics, set the house on fire, and any
signal reflection could kill you. (Vital organs fail with just a little
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