"Ian Iveson" wrote in message
...

In addition to sensible advice so far, and linked to the turns ratio
thing...a transformer allows for thick, high-current output winding,
and thin (therefore compact, low-leakage etc.) primary. An
autotransformer could do the same but only by compromising the
advantages you state.



** Autos have less copper losses and much better bandwidth than a
isolation type.

Wanna compare figures on a 4:1 impedance step down toroidal with a
160 VA size core ?





............ Phil