Re: SSTC on Ebay

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

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
 >
 > _
 >
 >
 >
 >
 >