Electronics > Beginners

Isolation transformer use beyond test & measurement ?

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BravoV:
As topic's title, nowadays, is there practical use for an isolation transformer, if any ?

Examples ?

BrianHG:
It got rid of that 'looping' ground buzz coming from the audio output of my old Sony HiFi VHS player.

Note that the buzz is because of the 'Y' capacitor and leakage in the switching supply transformer's crummy Hipot rating.

bob91343:
You can hook it up to run 240 Volts gear from 120 Volts.  Or vice versa.

BravoV:

--- Quote from: BrianHG on December 17, 2019, 03:48:14 am ---It got rid of that 'looping' ground buzz coming from the audio output of my old Sony HiFi VHS player.

Note that the buzz is because of the 'Y' capacitor and leakage in the switching supply transformer's crummy Hipot rating.

--- End quote ---

Hmm .. noted, thank you.  :-+



--- Quote from: bob91343 on December 17, 2019, 07:30:08 am ---You can hook it up to run 240 Volts gear from 120 Volts.  Or vice versa.

--- End quote ---

Its not step-down/up transformer, as it has 1:1 winding ratio.

bob91343:
It can be wired as step up or down.  For converting line power of 120V to give 240 V, just energize the primary and put the secondary in series.  You won't have isolation.

For the reverse, put the windings in series (be careful to get the phasing correct) and take output from one winding.

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