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A transformer couples two or more AC signals through a magnetic field. Often used as galvanic isolation and to transform one AC voltage to another.
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Powering 24 V and 12 V device simultaneously from two 12 V batteries
Alternatively, I know I could use a step-up or a step-down transformer, but at least one of the devices monitors and reports battery voltage (maybe both, not sure yet), which I would lose with a stabilized … If for example I have to use a step down converter to go from ~24v > ~12v, is there a type of transformer which simply divides the input voltage in half, instead of always producing a stable 12V output …