chrise at pobox.com
Tue Jun 1 09:20:49 CDT 2010
Good suggestion Tim and thanks to others for their suggestions too.
I'll give this a try and see how it pans out. I can sure test the
theory with a VARIAC. The original transformer is rated at 7.25V @
10A so I think the current capability is sufficient-- just too low of
a secondary voltage.
On Monday (05/31/2010 at 06:50PM -0400), Tim Shoppa wrote:
> 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).
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