[Boatanchors] BAMA Voltage Reducer Article

[J. Forster]

The two configurations are essentially identical. Any advantage of one
over the other is just about trivial.

Frankly, I doubt that modern transformers are designed that close to
saturation, because I cannot see Radio Shack, for example, selling 50 Hz
and 60 Hz transformers, made differently.

If a transformer is designed for 50/60 Hz; operating on 60 Hz, you have a
20% overvoltage margin.

YMMV,

-John

================


> Yes, this will work, but for reducing the voltage it is better to put the
> secondary in series with the primary. The phasing of the secondary is
> selected to reduce the voltage across the primary. What is being done is
> the
> secondary winding is being added to the turns in the primary winding. The
> supply neutral is connected the free end of the primary and the supply
> line
> is connected to the free end of the secondary. The output neutral is
> connected to the input neutral and the output line is connected to the tap
> between the primary and secondary. The reduces the voltage across the
> primary which reduces the transformer losses. Too many transformers are
> designed with the input voltage getting close to core saturation and the
> method suggested in the BAMA article puts the higher line voltage across
> the
> primary, which pushes the transformer even closer to saturation.
>
> John  WA4WDL
> --------------------------------------------------
> From: "J. Forster" <jfor at quikus.com>
> Sent: Sunday, November 18, 2012 10:07 AM
> To: "Jerry" <jsternmd at att.net>
> Cc: <boatanchors at mailman.qth.net>
> Subject: Re: [Boatanchors] BAMA Voltage Reducer Article
>
>> Just wire up a 6 or 12 volt filament transformer to buck the line.
>>
>> Primary goes across line and neutral; secondary goes in series with hot
>> side between line and load, phased to reduce line voltage; secondary amp
>> capacity must be > load current.
>>
>> Done,
>>
>> -John
>>
>> ===============
>>
>>
>>> A while ago the BAMA list had a nice article on building a voltage
>>> reducer
>>> to drop modern line voltage back t0o 110-115 vac.  BAMA mirror site
>>> Edebris
>>> does not have the article.  If someone has a copy can they email to me
>>> at
>>> jsternmd {at} att {dot} net
>>>
>>> Thanks
>>>
>>> Jerry
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>>
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>