Tesla Coils in the audible range (was Unconventional coiling)

To: tesla-at-pupman-dot-com
Subject: Tesla Coils in the audible range (was Unconventional coiling)
From: Sam Barros <sambarros-at-yahoo-dot-com> (by way of Terry Fritz <twf-at-verinet-dot-com>)
Date: Tue, 16 Feb 1999 11:31:46 -0700
Approved: twf-at-verinet-dot-com

I also wonder if anyone has resonated a
>tesla coil at low enough frequencies to be in the sound range. Any
>suggestions or info appreciated and can someone suggest a good coiler
book
>besides the basics?
>Sincerly Harvey D Norris



   Harvey,


 My "Coils of Destruction" resonate at the low KHz, high Hz range. The
circuit runs the coils at 5000Watts and they output a continuous 100kV
+. The sound it makes at full power is not much different from a Tesla
coil. The main difference is that the pulses are so strong that the
primary repels the secondary every half-wavelength. Because the
relatively low frequency allows them time to move before a voltage
reversal, the coils vibrate enormously. They tip over and fall if they
are not on a stable surface. The entire room can be felt vibrating
slightly when they are running (I'm serious here!!!). The arcs are
quite loud and I would compare the sound they make to a Pole-Pig arc,
but somewhat higher pitched. As they grow larger the pitch becomes
inaudible, muffled by the sound of the discharge itself.
 Finally, I would like to say this: The noise a spark makes comes from
the air around it heating up to several thousand degrees and expanding
to create a shockwave. Arcs are a continuous form of this process (we
all know this basics here, I suppose). Consequentially, the noise an
arc, or spark makes is very much the same no matter what the frequency
is, unless the arc is sufficiently low in power so that it doesn't
make so much noise by air heating.
 This is particularly true for Tesla Coils. You can't hear the
frequency noise they make but you sure as hell can hear the sparks!
 (Note this does not apply to small sparks and arcs, where you CAN
hear the frequency).



 Sam Barros.



==
 Sam Barros,
sambarros-at-yahoo-dot-com
ICQ#:15156975

 "The Less You Know, The Better You Sleep"...
 "Evolution Stops When Stupidity Is No Longer Fatal"
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