Re: NST frequency

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <darinwil-at-execpc-dot-com>

All right the caps are ceramic disk .01MFD 2KvDC, the diodes are
rectifier diodes "1N4005" I didnt get any specs as they were part of a
bulk pack. I have reduced the Cockroft to two stages with 3Kv 40ma
input. Question is now will I get enough out to make a DC coil? I have
tested the Cockroft and I can dead short the HV leads without
triggering the built in protection. Also a note about the diodes, with
three stages I was getting enough voltage out that if I hooked the HV
to one of them it acted like the diode was not even there so Im over
the voltage limit for the diodes with 3 stages.
> Original poster: "Darin Willson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <darinwil-at-execpc-dot-com>
>
> I think I was trying to get too much out it. With three stages there
is no
> corona leakage. The
> case of the transformer said that if the HV leads are shorted it
will
> stopworking untill
> the ground is disconnected for 10 sec. The diodes I am not sure of
the
> value as
> they were from a bulk pack but it was labled as rectifier diodes. I
will
> have to get the value of the caps
> later but they ceramic disk rated for 3Kv. Ill lookup the
capacitance and
> post it once I get the value.
> once again thanks for the help
> 8/1/2001 8:17:43 PM, "Tesla list" <tesla-at-pupman-dot-com> wrote:
>
> >Original poster: "Kevin Ottalini by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <ottalini-at-mindspring-dot-com>
> >
> >Darin:
> >        The number of stages should not directly affect the
inverter except
> >under load. I'm guessing that you actually overvoltaged something.
> >
> >What exactly did you use for the caps and diodes in the Cockroft?
> >
> >You should also monitor the input current to the inverter.  If the
current
> >goes
> >up when you add the Cockroft on then you have some sort of short or
> >breakdown happening (I expect a little increase).  Make sure the HV
output
> >from the Cockroft is isolated (no load) during the test.
> >
> >You shouldn't hear (or see) any corona (crackling) when the unit is
> >running.  If you do, than you have an isolation and leakage problem
> >that needs to be fixed before anything else can happen.  You may
> >actually be trying to generate too much voltage ... 9kv to 15kv DC
> >is all that you need for a DCTC.
> >
> >Without knowing exactly the voltage and frequency of the inverter,
it will
> >be difficult to calculate what the Cockroft will do, but if you
supply the
> >diode and capacitor values you used (value and voltage and type) I
can
> >give you an approximate idea of what is happening.
> >
> >Kevin
> >
> >
> >----- Original Message -----
> >From: "Tesla list" <tesla-at-pupman-dot-com>
> >To: <tesla-at-pupman-dot-com>
> >Sent: Wednesday, August 01, 2001 3:23 PM
> >Subject: Re: NST frequency
> >
> >
> >> Original poster: "Darin Willson by way of Terry Fritz
> ><twftesla-at-qwest-dot-net>" <darinwil-at-execpc-dot-com>
> >>
> >> Thanks for the info, I have built an Cockroft it is 3 stages. I
dont know
> >> how much it puts out but If I go for 4 stages
> >> the dead short protection for the inverter kicks in when I
discharge it
> >and
> >> I have to disconnect the power for 10secs
> >> before it will reset. Any one know where I can find equations for
a
> >> Cockroft so I can figure out what I am getting so far?
> >>