Re: dynamic power changing on TC

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

Original poster: "Crow Leader by way of Terry Fritz <teslalist-at-qwest-dot-net>" <tesla-at-lists.symmetric-dot-net>

My coils make the most noise with the arcs off the top vs. the spark gap
when tuned. When out of tune, the sparks are pretty quiet but the spark gap
really screams. When in tune, the spark gap quets down and as I said, the
noise comes from the arcs.

Either way, I still wear ear plugs.

KEN
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, January 13, 2003 7:29 PM
Subject: Re: dynamic power changing on TC


 > Original poster: "Black Moon by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<black_moons-at-hotmail-dot-com>
 >
 > you have to realise if its design to make sound, the spark gap is gonna be
 > so noisy as to make the output not worth lissioning to :P
 >
 > >From: "Tesla list" <tesla-at-pupman-dot-com>
 > >To: tesla-at-pupman-dot-com
 > >Subject: dynamic power changing on TC
 > >Date: Mon, 13 Jan 2003 11:12:56 -0700
 > >
 > >Original poster: "Jim Lux by way of Terry Fritz <teslalist-at-qwest-dot-net>"
 > ><jimlux-at-earthlink-dot-net>
 > >
 > >Any ideas on how to implement a rapid response (10s of milliseconds)
 > >"volume control" for a spark gap type tesla coil (at constant break
rate)?
 > >(It's fairly straightforward for a VTTC...essentially a high power AM
 > >modulator)
 > >
 > >Some ideas:
 > >
 > >Adjust the voltage being fed to the primary which would change the "bang
 > >energy". Assuming you're using a triggered spark gap, what sort of
voltage
 > >range can work... Easily 2:1, but can you get more?  Those of you running
 > >triggered gaps, what interaction have you noticed when running the variac
 > >up and down?  With resonant charging, this is tantamount to a power
 > >amplifier with multi kilovolt output, but at least it's in steps.
 > >
 > >Adjust the tuning of the coil, for which I can think of at least two ways
 > >to do it:
 > >
 > >Multiple primary taps with separate triggered gaps connecting them to the
 > >primary capacitor.  You would fire the "optimum" gap to get the most
 > >energy, and one of the "non-optimum" gaps to reduce the output voltage
 > >(because the fres of the Pri and Secondary would be farther apart, and
 > >you'd reduce output power), even though the primary cap energy remains
the same
 > >
 > >Some sort of "off axis" inductor or capacitor switching scheme with some
 > >suitable switch device (which doesn't have to respond at RF, just pass
RF...)
 >
 >
 >
 >
 >