How to determine Neutral/Live from transformer output

[abuhafss]

Hi

Recently I received 110VAC pneumatic Solenoid Valves from AliExpress, though I had ordered for 12VDC. To save time I decided to use them but here we have 220V 50Hz.

Since the solenoids are very small, I planned to wind a small step down transformer. The question is how do I identify the neutral and live wires from the 110VAC output of the transformer? Or I just connect any one wire directly to the solenoids and the other wire thru relays?

 

[Bluejets]

There is no neutral or active until the output is referenced to ground.
Your final guess is correct.

 

[abuhafss]

OK, thanks for the input.

 

[duke37]

If you wind an auto transformer then neutral in = neutral out.