Quoth Michel van der Meij at 2013-12-02 08:16 ...
...The only "problem" is that you need to have a power supply available between the 2 optocouplers that can carry a 1kV working voltage. For testing you could use a 9V battery, or a DC/DC converter as in attached drawing.
You can also use cascaded (isolated) DC/DC converters - every transformer providing isolation. (I believe that transformer cascading is one method of getting very high voltages in the first place.)
The high-isolation stuff I've been looking at would probably just have a couple of AA cells per stage - cheap and easy, as this isn't a system that would be run more than occasionally.
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