Re: SSTC on Ebay

["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>

With 3" sparks, a toroid larger than a lifesaver candy would suppress any
sparks at all.

KEN

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, January 30, 2003 1:22 AM
Subject: Re: SSTC on Ebay


 > Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<dhmccauley-at-spacecatlighting-dot-com>
 >
 > No offense, but I would hope that the $450.00 price would at least include
a
 > small toroid.
 >
 > Dan
 >
 >
 >
 >  > Hi All,
 >  >
 >  > I am selling a small, completely finished SSTC on Ebay. For those of
 >  > you who have spark-gap coils but have never seen the flame of an
 >  > SSTC, now's your chance!
 >  >
 >  > The auction may be seen at:
 >  >
 >  > http://cgi.ebay-dot-com/ws/eBayISAPI.dll?ViewItem&item=2909397286
 >  >
 >  > The Ebay item number is: 2909397286
 >  >
 >  > I built this coil to sell, with extreme reliability in mind.
 >  >
 >  > For those interested, the circuit is a "quasi-feedback" type, meaning
 >  > that there is an oscillator (555) that powers the coil at low input
 >  > voltages (less than one volt), and the feedback signal kicks in at
 >  > voltages greater than a volt. This allows a smooth RF envelope, and
 >  > the ability to run 1/2 wave DC into the bridge (for sparklength)
 >  > while the circuit exactly tracks the resonant frequency for
 >  > efficiency and reliability. The feedback signal is taken from the
 >  > small antenna to the left of the tesla transformer on top of the blue
 >  > box. The power electronics is a half-bridge using IRF640's (200V
 >  > 20A).
 >  >
 >  > There is a start-up circuit using a single MOSFET in series with the
 >  > low side of the half-bridge. A resistor divider, cap, and diode are
 >  > arranged where the gate of this FET slowly comes to 12V when the unit
 >  > is plugged in and switched on. The button may be pressed on and off
 >  > quickly, and/or it may be plugged in and out quickly with no damage
 >  > to the unit. I will have schematics and pics on my website soon....
 >  >
 >  > Thanks for looking at the auction ; )
 >  >
 >  > Take care,
 >  >
 >  > Justin Hays
 >  > KC5PNP
 >  > Email: justin-at-hvguy-dot-com
 >  > Website: www.hvguy-dot-com
 >  >
 >  > _
 >  >
 >  >
 >  >
 >  >
 >  >
 >
 >
 >