31 May
2010
31 May
'10
10:50 p.m.
Probably the lowest effort option also makes the fewest changes to the
original: A small external "boost" autotransformer to give maybe 10 or 15%
extra headroom.
This could be done without using a big transformer. What you do is use
a say 20VAC 3A transformer secondary in series with the primary, wired
to that you end up with 140VAC with 120VAC in. This can use a physically
much smaller transformer than a 140VAC 3A isolation transformer.
I'm guessing the AC current at the input to the power supply is circa a
very few amps or so (why I suggest a 20VAC 3A unit above).
Tim.