To reinforce what Will has just said, there is a good article on a ht
supply in this month's edition of "Amateur Radio", the magazine for members
of the Wireless Institute Of Australia.
The article is by Drew Diamond, VK3XU and it uses 2 of the transformers
with the primary windings in series and the secondaries in series or parallel.
I do not have a website but I can email a pdf of the article to somebody
who does.
73, Alek.
VK6APK
At 03:30 AM 22/03/2006, Will Matney wrote:
>Gerald,
>
>My guess by seriesing two will drop the flux density in each to around 10
>kilogauss as each will have 1/2 the line voltage across it. That's well
>below the bottom of the knee and in the linear region. It will raise the
>power capability X2 also, but I can't say how much without knowing the
>core dimensions. Two this way though will run as good or better than a lot
>of off the shelf linear transformers because of the low flux density. This
>means the efficiency is really high, probably 95% for a rough guess.
>
>Best,
>
>Will
>
>
>*********** REPLY SEPARATOR ***********
>
>On 3/21/06 at 2:22 PM TexasRF@aol.com wrote:
>
> >Thanks Will and John; I now have an understanding of the heating issues
> >with
> >the MOT. It appears that these transformers are really a poor choice for
> >continuous operation such as a filament power source. Two transformers
> >with the
> >primary and secondary windings series connected will work and for testing
> >the
> >traveling wave tubes is the quick method to be used.
> >
> >Many thanks for your help in my continuing education!
> >
> >73,
> >Gerald K5GW
> >
> >
> >
> >In a message dated 3/21/2006 11:10:15 A.M. Central Standard Time,
> >craxd1@verizon.net writes:
> >
> >If you want to add turns to the primary (if there's enough room, and
> >should
> >be with the secondary removed), you can do a simple test to see how many
> >turns to add. First, use the formulas I published last week about
> >figuring the
> >core size and number of turns to find the correct number of turns for the
> >core
> >size you have. Next, connect the primary to 120 Vac and wind a 10 turn
> >coil
> >secondary. Take that secondary voltage and divide it by the 10 turns.
> >That
> >will be the turns per volt. Last, wind the extra turns you've found you
> >need by
> >the formulas and the known turns per volt. One good thing on this
> >transformer
> >in question, the primary is on the inside. If on the outside, you'd be
> >screwed on removing the secondary.
> >
> >Best,
> >
> >Will
> >
> >*********** REPLY SEPARATOR ***********
> >
> >On 3/21/06 at 11:42 AM John Popelish wrote:
> >
> >>TexasRF@aol.com wrote:
> >>
> >>> Not what I hoped to hear but I appreciate the good info!
> >>
> >>If you have a supply of this kind of landfill, you might put two
> >>similar units side by side, wire the primaries in series (effectively
> >>halving the volts per turn, so eliminating the saturation problems).
> >>Then you can knock the shunts out and wind a similar secondary on each
> >>(doubling the number of turns to compensate for the half primary
> >>voltage) and wire those two secondaries in parallel. This gives you a
> >>reasonably efficient transformer (that won't overheat without a fan)
> >>with about a kVA rating.
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> >
> >
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> >
> >
> >
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>
>
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