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In Reply to: RE: Transformer secondary measurement posted by tesla on August 05, 2013 at 19:16:54
Hi Tesla
Thanks for your response.
I've don't have a dual secondary; two wires into the primary side 115V, and two wires out the secondary 25V.
Now on the primary side I get a hot and neutral in from the mains, right? I was wondering if the output on the secondary would be the same i.e. one hot, one neutral?
I'm thinking on the secondary both lines would be hot, and the voltage across the lines would be 25VAC. In short, my input to the primary is unbalanced, but the out would be balanced. (Unless of course I tie one of the outputs to ground that is)
Thanks
Cleet
Follow Ups:
Cleet, you are right.
The primary from the house wiring will be 110 to 125 volts ac, and facing the outlet, the right hand slot will be hot, obviously the left hand will be cold, (Neutral) and the center will be safety ground.
The output (secondary) will be 25vac from lead to lead, just as you said.
Hope this helps.
Gene
"The Blues isn't about feeling better. It's about making other people feel worse and making a few bucks while you're at it" "Bleeding Gums" Murphy
Hi Gene.
Yep, it sure does. Thanks
It seems to me that we cannot comment on the voltage of the individual wires from the secondary as we need some reference to measure the voltage from, and the only reference we have is the other output cable. Hence the “only” voltage measurement we can make is between the two cables which is 25VAC?
Years ago I saw an old schematic (probably circa 1950 – 1960?) where a center tap was derived by grounding both output leads individually through a pair of resistors to a common ground , rather than shorting one of the outputs directly to ground as is the more common approach.
I don't see anything like that on schematics I find online, so I assume that was a dangerous practice? I was thinking I could perhaps do that, have the output grounded and balanced rather than grounded and unbalanced.
So in my case, I could use a 12.5 ohm resistor per side, ground the output individually to ground via a resistor, and then achieve a 12.5VAC from each cable to ground?
Bad idea?
Thanks
Cleet
I suggest you read this, and look for additional sources on the internet as needed.
There are many different transformers, many different kinds of circuits using transformers, and hopefully this will help you understand them, and their applications better.
Here are so more images of transformer power supply schematics, from Google, and the examples shown may be easier to follow.
http://www.google.com/search?q=transformer+power+supply+schematic&tbm=isch&tbo=u&source=univ&sa=X&ei=MkcEUviqJKa-igKRj4GgDQ&ved=0CCoQsAQ&biw=1024&bih=601
"The Blues isn't about feeling better. It's about making other people feel worse and making a few bucks while you're at it" "Bleeding Gums" Murphy
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