Re: Equidrive P.S.

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

Original poster: "Allanh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <allanh-at-starband-dot-net>

If only tweleve diodes are used, I would recommend
putting a 1 meg 1 watt resistor accross each diode as the
reverse resistance of each diode is exactly the same and
could result in excessive voltage accross one or more
diodes. I have used a similar circuit in building power supplies for Amateur
radio transmitters.  If 1n4007's are
used, if might also be a good idea to include a 10 ohm
10watt resister in series with each string to reduce inrush
current. The MOT diodes have a higher forward resistance and thus don't need
one.

allan

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, December 31, 2001 11:06 AM
Subject: Re: Equidrive P.S.


>
> Original poster: "Allanh by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<allanh-at-starband-dot-net>
>
> I believe that the center of the two MOT diodes should be connected to
> ground, two reasons, it will balance the
> load on the diodes and the caps.
>
> allan
>
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Sunday, December 09, 2001 12:08 PM
> Subject: Re: Equidrive P.S.
>
>
> > Original poster: "J. B. Weazle McCreath by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <weazle-at-hurontel.on.ca>
> >
> >
> > Hello Greg, Coilers,
> >
> > You're right, the diagram does have a nice "balanced" look to it.
> > A question for you...have you found from experience that twelve
> > of the 1N4007 diodes are sufficient?  I've got a 6 KV, 250 mA.
> > power transformer that I was thinking of using for an experiment
> > with the D.C. resonant charging.  I plan on using a full wave
> > bridge with one of my 9 uF. -at- 60 KV capacitors for the supply,
> > and wondered about the P.R.V. of a string of 12 being enough.
> >
> > The "de-Qing" or blocking diode would have to hold off the rather
> > high reverse voltage spike from the charging choke.  As well, it
> > would have to stand up to whatever RF managed to sneak through the
> > choke, although it won't be much with the inductance being high!
> > Maybe a string of 4 or 5 M.O. diodes would work nicely for that.
> >
> > As to the charging choke itself, since one end of the secondary is
> > already connected to the MOT core, I'm going to leave it that way
> > and connect the core end of the winding to the blocking diode of
> > the power supply and the other end to the tank circuit of my coil.
> > Anyone see a problem with that?  I think I'll put the entire choke
> > in a PVC junction box, immersed in oil, and bring the two leads
> > out through porcelain feedthrough bushings.
> >
> > 73, Weazle, VE3EAR/VE3WZL
> >
> > Listening: 147.030+ and 442.075+
> > E-mail:    weazle-at-hurontel.on.ca
> >            or ve3ear-at-rac.ca
> > Web site:  http://www.hurontel.on.ca/~weazle
> >
> >
> >
>
>
>