On 7/6/13 2:39 PM, Mark C. Stephens wrote:
How Does that Work Robert? I mean why out of phase?
Then the voltage on the secondary of the buck transformer is subtracted from the line voltage.
This is a very common thing commercially where you have what's called a "buck/boost" transformer to adjust the line voltage. Typically to boost it at the end of a long run where resistive drops make the voltage too low.
The low voltage secondary must be big enough to carry the entire load current, of course.
-----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Robert Atkinson Sent: Sunday, 7 July 2013 12:57 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 5370B dropping mains voltage Hi Marki, Dropping the mains voltage is easy. Get a mains to low voltage transformer. Connect the primary across the mains and the secondary in series opposition (out of phase) with the mains supply. Foar example a 100VA 12V transformer will drop your mains to just under 238V with a maximum load of 8A (the current rating of the secondary). HTH, Robert G8RPI.
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