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RE: Transformers offer some filtering, but not as much as chokes.

Posted by wheezer on July 4, 2007 at 07:00:01:
The issue with the digital iso tranny, as I found, is when you put the pair of PT's back to front (secondary >RC> primary) the regulation goes backwards, leaving you with around 100V, depending on the load. Even with Signal PT's. The solution is to put at least an 80VA before the pair. BUT...it gets expensive. Might as well use a similar sized PT in BP mode.

Excellent feedback on Al's 1/2 of JR's digital filter. I do plan to try it.

Al believes the choke tweak works well. BUT....Ya really shouldn't use a plug. It needs a switch and snubber (cap or mov). For power out and plugged in, a cap across the switch will keep the circuit closed and gently discharge the choke.
If the plug is pulled say for comparative purposes, the potential across the choke has nowhere to go, but opening the windings or worse! I'll revisit it and add the DPDT relay with RC across for de-energizing.
Thanks for the update.
W