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DC-DC 5Vto2x12V Converter Board
An USB powerd DC-DC Converter that provides +12V and -12V. It's based on the RECOM REC1.5-0512DR/X1 you can by for example at Pollin.de.
The modification of the Mini-USB socket:
Datasheet:
RECOM REC1.5-0512DR/X1
dc-dc_5vto2x12v_converter_10.xcf.zip
Components: