Electroenthusiast
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How are they designed?
I know that these transformers have 1:1 turns ratio. How exactly do they limit the current? and how are they useful in driving sensitive electronic devices(microphones)? Do they work on DC (Transformers working on DC!)?
I know that these transformers have 1:1 turns ratio. How exactly do they limit the current? and how are they useful in driving sensitive electronic devices(microphones)? Do they work on DC (Transformers working on DC!)?
PHP:
[I]An isolation transformer is a device that provides DC isolation from the power grid (or mains). At the same time, it provides an AC connection to couple in the power that you've connected to the grid to get. Recall that the power grid is an AC (alternating current) source, and we can use transformers to couple AC from one circuit to another while providing DC (direct current) isolation.
An isolation transformer is often a 1:1 device that neither steps the supply voltage up or down, but just couples it in. In most cases, the transformer will have a lower current output than the AC main circuit itself, but provides that DC separation from the main AC source. This will allow the devices or loads to `float`in a sense, and by doing that, references to earth ground can be eliminated. [/I]
Reference: http://wiki.answers.com/Q/Operation_of_an_isolation_transformer