Electronics > Projects, Designs, and Technical Stuff
lowering a.c. voltage output for power supply
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David Hess:

--- Quote from: sam[PS] on February 28, 2020, 04:54:29 am ---
--- Quote from: David Hess on February 13, 2020, 12:42:09 am ---The current is a little low but if you have a 24 volt AC output and a 15 volt AC output, then wiring them in series and anti-phase will produce 9 volts AC.
--- End quote ---

That's assuming there is no capacitive effect there to screw your phase alignement. i.e. probably not a good idea in real world.
--- End quote ---

The power line frequency is low enough that I have never seen it not work even with massively different transformer sizes.  The phase shift is just not that great.

It is not uncommon to do with only one transformer.  A low voltage floating winding can be placed in series or anti-series to buck or boost the voltage of the main winding which would otherwise require multiple taps.
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