Re: MOT-powered coil questions

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

Original poster: "Steve K by way of Terry Fritz <teslalist-at-qwest-dot-net>" <teslainnovations-at-yahoo-dot-com>

Claude,
  I am not using a doubler on my MOT supply, it's AC
current. Sorry to have mislead you, I didn't read all
of this discussion...I can make you a diagram for the
13kv, 4 MOT supply, (voltage boosted with microwave
caps, but not in a multiplier circuit), if you'd like
to see that.

Steve Klec

--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > Original poster: "claude masetto by way of Terry
 > Fritz <teslalist-at-qwest-dot-net>"
 > <claudmas-at-optusnet-dot-com.au>
 >
 > Hi Steve, have you got a diagram of your D.C MOT
 > power supply and charging
 > choke.
 > Claude.
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Thursday, May 29, 2003 11:46 PM
 > Subject: Re: MOT-powered coil questions
 >
 >
 >  > Original poster: "Stephen Conner by way of Terry
 > Fritz
 > <teslalist-at-qwest-dot-net>" <steve-at-scopeboy-dot-com>
 >  >
 >  > At 19:12 28/05/03 -0600, you wrote:
 >  > >Original poster: "Gregory Hunter by way of Terry
 > Fritz
 >  > ><teslalist-at-qwest-dot-net>" <ghunter31014-at-yahoo-dot-com>
 >  > >
 >  > >Quenching a low voltage/high current arc
 > presents
 >  > >difficult design challenges that most newbies
 > would do
 >  > >better to avoid. Raising the voltage a bit with
 > a
 >  > >level shifter, or by simply using 4 MOTs instead
 > of 2,
 >  > >sidesteps many problems and greatly simplifies
 > spark
 >  > >gap design.
 >  >
 >  > I do tend to agree. A great way I've found of
 > using MOTs is to use a
 >  > voltage doubler circuit (a Greinacher doubler for
 > all you HV weenies) that
 >  > produces a filtered DC output. Two of these
 > doublers wired to a single MOT
 >  > will produce +/-5kV ie 10kV in total at around
 > 80mA. Of course being a DC
 >  > coil you need a charging choke and a rotary gap.
 > But the high voltage and
 >  > high inductance of the choke make quenching easy
 > so the spark gap design
 > is
 >  > a no-brainer. I used a vacuum cleaner motor and
 > brass screws for
 >  > electrodes. Also the choke is easy to make from
 > several off-the-shelf
 >  > chokes in series, and you don't need any other
 > kind of ballast. The
 >  > downside is that you need to collect lots of MO
 > caps and rectifiers, by
 >  > which time you would have got at least 4 MOTs
 > anyway |-6
 >  >
 >  > My fellow countryman Dave Gamble has a similar DC
 > coil but with two MOTs
 > in
 >  > series to produce a total of 20kV DC. His
 > charging chokes were made from a
 >  > couple more MOTs with the 'I' part of the core
 > sawn off. He gets up to 7'.
 >  >
 >  > Steve C.
 >  >
 >  >
 >  >
 >  >
 >
 >