Hi,
I'm looking for a 240v toroidal isolation transformer (200va) that has an electrostatic screen between the primary and secondary, to reduce noise coupling from the mains side.
Toroidal mains transformers have a high primary-secondary capacitance due to the tightly coupled windings, so any high frequency disturbances on the mains side tend to get coupled to the secondary side quite effectively unless the shield is in place.
I've looked on RS, farnells, Rapid, CPC (UK) and cannot find any manufacturer that offers this feature with their transformers. Hammond does but only on their 115v product line.
Any suggestions?
I could 'roll my own' I suppose by taking a new Xmr apart if all else fails. Is the primary winding on the inside or outside with toroidal transformers? If on the inside, I could just pick any 200va Xmr with a 240v primary and dump the secondaries before winding my own over the primary. Easier to buy one though if they exist.
Thanks.