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I know they have low power 6 pack chips that can be very affordable, with a maximum current of maybe 10 amps or something. But they are not isolated. I"ve never messed around with those, but I would like to eventually. Those are rated for 600v though, so the sevcon probably uses some low voltage mosfets and boot-strapping (however the heck that works). The 6 isolated supply way of doing it is the sledge hammer approach.
I love the idea of the LED morse code!!
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