[Boatanchors] OK Smart People: Capacitive Voltage Divider?

[Phil]

I'd suggest making an external box with a 12 Volt bucking transformer 
connected to an electrical outlet on the box.  Then just plug the box 
into the wall and the radio into the box.  (A 12 Volt drop would 
probably be sufficient).

73 de Phil,  KO6BB
http://ko6bb1.multiply.com/ (OTR Blog)
http://www.qsl.net/ko6bb/  (Web Page)

RADIOS:
Grundigs: Satellit 750 (2011), S-350 (2006)&  G6 (2011).
Icom: R-75 with Two 250Hz CW Filters.
Kenwood: TS130S Transceiver (circa 1980).
Radio Shack: DX-380 digital portable (circa 1990).
Yaesu: VX8R Quad-Band HT (circa 2010).
Zenith: Royal-7000 Transoceanic (circa 1969).

ACCESSORIES:   Homebrewed LF Pre-Amp, MFJ-949E HF Tuner
                W9GR Audio DSP&  Homebrewed 6 Hz Filter.

ANTENNAS: 88' Long Ladder-line fed dipole, Apex at 35 feet.
           Amplified Mini-Whip up 29 feet for LF/MW
Merced, Central California, 37.3N 120.48W  CM97sh


On 3/18/2012 2:15 AM, David Stinson wrote:
> I'm resurrecting a National NC-100A.
> Sounds beautiful.  Nice AM, BCB and SWL rig.
> One problem:  our blasted 125 Volt AC power lines.
> This rig wants 110 volts and 125 is very tough on it.
> There is no room to hog-wire in a bucking transformer,
> so that's out.   Niether can I dedicate a variac to running
> this receiver.
> I understand one can use capacitors as an
> AC voltage divider by placing one in series with
> a leg of the transformer primary and one across the
> transformer primary.
>
> How can a dummy who can barely do the math
> needed to number book pages determine what
> values to use to drop this primary voltage from
> 125 to 110? Or even if it will work?
>   Easy!  He askes the dozens of people
> smarter than him on the mailing lists.
> Ain't that cool?  ;-)
>
> TNX ES 73 DE Dave AB5S
>
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