I need an approx. 48Vac (rms) source for some quick testing.  So I open 
an adjustable DC wal wart, remove the capacitor, but found the maximum 
tap I could get was about 24Vac.  As it is a 240Vac line here, and there 
  is an option to switch the line select to 110Vac, I gave it a try 
(actually 2 tries to burn 2 transformers).

With no load, the transformer burned out few second later.  The iron was 
hot, and the primary side seemed to be burned out as it was measured 
open.  I could not cut through the paper to see what had burnt last 
night as they were hot, but they are gone now (thrown off).

Any ideas what could have burnt? coil shields or thermal fuse?

or more important question is there an easy way to get over the 
limitation? so I can take advantage of the 110Vac selection in 240Vac 
line to get a few more AC output.

Ling SM
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