12v Fan

mapj1:

Be aware that a lot of so called "lighting transformers" are not transformers at 50Hz at all, especially the lightweight ones, rather there is a rectifier that takes the mains to DC and some power transistors that chop it into a square wave at a supersonic frequency, and apply it to a transformer with a much smaller and lighter core than would be possible to shift the same power at 50Hz. This saving in copper and iron costs justifies the complexity, especially at higher wattages.

Lights generally do not care, as filaments will heat up on 50KHz just as easily as 50Hz, and LEDs rectify it anyway.

However some 12V fans are shaded pole motors with shorter fatter windings than their mains relatives, and really do need a nice sine wave at the right frequency to rotate at all - for these a conventional iron and copper transformer is required not a so called 'electronic transformer'..

mapj1:

Be aware that a lot of so called "lighting transformers" are not transformers at 50Hz at all, especially the lightweight ones, rather there is a rectifier that takes the mains to DC and some power transistors that chop it into a square wave at a supersonic frequency, and apply it to a transformer with a much smaller and lighter core than would be possible to shift the same power at 50Hz. This saving in copper and iron costs justifies the complexity, especially at higher wattages.

Lights generally do not care, as filaments will heat up on 50KHz just as easily as 50Hz, and LEDs rectify it anyway.

However some 12V fans are shaded pole motors with shorter fatter windings than their mains relatives, and really do need a nice sine wave at the right frequency to rotate at all - for these a conventional iron and copper transformer is required not a so called 'electronic transformer'..