[Boatanchors] [Milsurplus] OK Smart People: Capacitive Voltage Divider?

[Walt - WB2VSJ]

Google University has your answer (And pictures)   :)

http://www.antiqueradios.com/forums/viewtopic.php?f=12&t=181428


-----Original Message-----
From: boatanchors-bounces at mailman.qth.net
[mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Rob Atkinson
Sent: Sunday, March 18, 2012 8:48 AM
To: boatanchors at mailman.qth.net; boatanchors at theporch.com
Subject: Re: [Boatanchors] [Milsurplus] OK Smart People: Capacitive Voltage
Divider?

I have a question about using a filament transformer to buck 125 v.

It seems to me if you put your 125 v. across the filament winding on the
secondary, then the primary (that normally has 120 v. on it) would have over
1000 v. sitting there?  Unless I am mistaken I'd take care when doing this
to wrap the primary lugs with 1 kv electrical tape or
cover them in some other way.   Or, am I somehow mistaken about this.

73

Rob
K5UJ


>
>> 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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