Re: Ganging 1256D's -- T5587 Choke

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

Original poster: "Bert Hickman by way of Terry Fritz <twftesla-at-uswest-dot-net>" <bert.hickman-at-aquila-dot-net>

Chuck and All,

The balancing transformers are nice when more than two variacs are going to
be connected in parallel. However, if you only need to tie two variacs
together, an even easier way is to make a home-brew center-tapped high
current choke. Because the worst-case voltage difference between identical
variacs should be only a few volts or so, it shouldn't take very many turns
of heavy gauge wire wound on an iron or ferrite core to do the trick - say
20 total turns of #4 or $6 AWG, tapped half way through. Most of the flux
in the core ends up being canceled as current is pulled through the center
tap of the choke. The configuration is as follows:

            _____________
 Wiper #1   =============    Wiper #2
      <-----OOOOOOoOOOOOO-------->
                  |
                  |
                  |
                  |------  Out
           
Best regards,

-- Bert --
-- 
Bert Hickman
Stoneridge Engineering
Email:    bert.hickman-at-aquila-dot-net
Web Site: http://www.teslamania-dot-com

Tesla list wrote:
> 
> Original poster: "Chuck Curran by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <ccurran-at-execpc-dot-com>
> 
> Hi Richard:
> 
> I seem to have gotten several inquires on this topic.  I have uploaded a
> couple of drawings to my web site so interested people can get the
> information.  This evening I did go over in detail the Superior choke and
> that info is up there.  The drawing is available along with a view of the
> connection method for this choke, scanned from the Superior Powerstat
> catalog.
> 
> Go to:  http://www.execpc-dot-com/~ccurran       Select the link:  "Paralleling
> 1256D Powerstat Details"  which is about 2/3 of the way down the index page.
> 
> Chuck
> 
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Thursday, March 15, 2001 5:10 PM
> Subject: Re: Ganging 1256D's -- T5587 Choke
> 
> > Original poster: "Richard Wayne Wall by way of Terry Fritz
> <twftesla-at-uswest-dot-net>" <rwall-at-ix-dot-netcom-dot-com>
> >
> > Chuck ,
> >
> > What is the inductance of the choke?  How many turns on the toroid?  Are
> the
> > two choke coils wound opposing or in the same direction?
> >
> > Thanks,
> >
> > RWW
> > >
> > > I would not buy another one of these.  I did already see Scott's
> comments
> > > about making your own, and I think he has made some good observations.
> Just
> > > make sure to get the turns direction correctly wound.
> > >
> > > Chuck
> > >
> > >
> >
> >
> >