24 May
2011
24 May
'11
10:01 a.m.
I am restoring an old IBM terminal with a ferro
resonance transformer.
I slowly increase the prim voltage with a variac.
At the same time I measure the sec voltages.
The normal voltage at the prim site is 240V
At +/- 130V (prim) I have already normal voltage at the sec site.
(+5V , -18V etc)
The sec side is loaded and contains no regulators.
Anyone any idea why at 130v everything is normal.
I don't dear to go to 220V
For a high quality ferroresonant transformer, this is possible. They
can often maintain regulation over a very wide range of input voltage.
--
Will