On 11/05/2019 11:38, Fredxx wrote:
Maybe the cheapest auto-transformer is a standard one with 2 x 110V
primaries. I expect a true autotransformer with the same rating will be
smaller.

Correct. Autotransformers are wound with no secondary and lighter gauge
wire on the HV side of the primary.


But Tony only needs a few watts anyway. So I am thinking that a POS low
voltage split primary mains transforner will do the job


--
"First, find out who are the people you can not criticise. They are your
oppressors."
- George Orwell