Re: MOT w/doubler question

["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>

Pete,

On my web site I've got a schematic of a simple twin
MOT power supply with voltage doublers.  My design is
based on Marco's MOT supply, but using 115V MOTs
instead of 220V units.  The schematic also includes a
primative, but effective RC protection circuit.  The
filter caps are available for $1 each through mail
order sources.  The power resistors are widely
available from Mouser, DigiKey, etc. Once I froze my
design and quit changing things, I never blew another
diode.  I'm now using the two MOTs as a pig ballast,
but the doubler diode strings (two sets of twelve
1N4007s) worked fine for months, and they are still
good.

Cheers,

Greg
www.angelfire-dot-com/ga3/tesla

--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Peter Lawrence by way of Terry
> Fritz <twftesla-at-uswest-dot-net>"
> <Peter.Lawrence-at-Eng.Sun-dot-com>
> 
> I'm trying to make sure I understand how a voltage
> doubler (like in a 
> microwave oven circuit) works
> 
> 
>          +------------+-------------------- HV out
>          |            |
>         ---           |
>         CAP           |
>         ---           |
>          |            |
>          |            -
>          |            D
>        x S w          I
>        f e i          O
>        r c n          D
>        m d d          E
>        r r i          -
>          y n          |
>          | g          |
>          |            |
>          +------------+--------------------
>                       |
>                       |
>                      GND
> 
> 
> If I am understanding this correctly, the top of the
> xfrmer secondary winding
> does +1900v to -1900v and back at 60 Hz; 120 peaks
> counting both + and - (???).
> 
> The "HV out" does 0 while the diode is conducting,
> and (2 * 1900), ie the
> sum of the secondary V plus the CAP V, while the
> diode is non-conducting,
> at 60 Hz;   60 peaks, pulsing DC ie only one
> polarity (???).
> 
> 
> Therefore: TC using MOT w/ voltage doubler will do
> 60 BPS. (?)
> (or maybe more if the Tank cap can be charged
> multiple times in one (half)
> cycle).
> 
> The way I see it (someone correct me if I'm wrong)
> putting two MOTs w/doublers
> in series with common ground you get (4*1900v) at 60
> BPS and it is pulsating
> DC, at least if you connect everything up correctly
> (swap one of the diodes 
> from the way it was in the M-O, and connect the
> primaries in anti-parallel)...
> 
> 
>          +------------+-------------------- HV out
>          |            |
>         ---           |
>         CAP           |
>         ---           |
>          |            -
>          |            V diode
>          S            -
>          E            |
>          C            |
>          |            |
>          +------------+-------------------- GND
>          |            |
>          C            |
>          E            |
>          S            -
>          |            V diode
>          |            -
>         ---           |
>         CAP           |
>         ---           |
>          |            |
>          +------------+-------------------- HV out
> 
> 
> thanks,
> Pete Lawrence.
> 
> 
> 


__________________________________________________
Do You Yahoo!?
Yahoo! Auctions - Buy the things you want at great prices. 
http://auctions.yahoo-dot-com/