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How to simple get simetrical 8-15V from 5V USB rail with one DC/DC converter?

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Hi, i'm looking for simple solution to convert 5V USB to 8-15V simetrical but at least 50mA output. Anyone have a idea do this as simple as possible? I've tested solution with max232 IC - source of simetrical +-8V but current is too low. I will be gratefull for all ideas.

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