Hcn 14-12500
Just to document it, this is the power supply they used for the patent:

Available here: Helmut Singer Elektronik - Gebrauchte und geprüfte Mess- und Kommunikationstechnik
Datasheet not in English: http://www.helmut-singer.de/pdf/fughcn.pdf
It's about $500, you can obviously do this low budget, but just for reference...
Just to document it, this is the power supply they used for the patent:

Available here: Helmut Singer Elektronik - Gebrauchte und geprüfte Mess- und Kommunikationstechnik
Datasheet not in English: http://www.helmut-singer.de/pdf/fughcn.pdf
It's about $500, you can obviously do this low budget, but just for reference...
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