Re: MOTS and the dc output

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

Original poster: "Gregory Hunter by way of Terry Fritz <twftesla-at-uswest-dot-net>" <ghunter31014-at-yahoo-dot-com>

Will,

The output of the twin MOT power supply with voltage
doublers is about 12kvdc pulsed at 60Hz.  The voltage
doublers produce an output similar to half-wave
rectified AC.  The waveform is distinctly different
from regular sine wave AC or filtered DC.  Try to
visualize a 60Hz sine wave with the bottom half cut
off right at the 0v reference line. What's left is a
series of positive humps with an interval of 180
degrees. The half-wave pulsed output actually has a
dead (0v) space between each pulse equal to 1/2 of an
AC cycle.  No power is being lost or wasted--it is
during this dead time that the doubler caps are
recharging.  On the second half-cycle, the doubler
caps dump their charges in series with the transformer
secondaries, so the "lost" half-cycle is made up for
with a bigger pulse.

To answer your MMC question, you may use the DC rating
of your caps when calculating the number of caps to
put in series.

Since you have plenty of NSTs, I'm puzzled by your
interest in MOTs, as NSTs are superior in every
respect for hobby-type coiling. I view MOTs as an
improvised power supply to be used when nothing else
is available. On the other hand, I suppose there's
something to be said for experimentation.  My own
hobby activities are not always governed by
practicallity, and sometimes I build things just to
see if I can.

Best Regards,

Greg
http://hot-streamer-dot-com/greg

--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "will dork by way of Terry Fritz
> <twftesla-at-uswest-dot-net>" <vcdmasta-at-hotmail-dot-com>
> 
> 
> Hello everyone,
> 
> I just started to think about using mots as a power
> source. I have plenty of
> nsts, but decided i want to try something new
> possibly, since they seem to have
> much amperage. I was just wondering, about caps for
> mots, as the output seems
> to be dc. If i were to make an mmc, then could i use
> the dc rating on the cap
> instead of the ac, right? Also, what does it mean
> that the dc is pulse? Does
> this mean that it is pulsing at 60Hz? If so,
> wouldn't this just be ac, as
> normal dc 0Hz? If it is at 60hz, do i have to use ac
> ratings on mmc caps? Sorry
> for all the questions, thanks
> 
> Will McManus
> 
> 
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