The Micro -9V Charge Pump was designed to help out with pedals that
require a positive ground for PNP transistors but would also allow daisy
chaining with other pedals on the same power supply. The tiny board has
solder tabs for 9V (+) battery input, (2) ground tabs, -9V supply and
+9V supply for your LED. The board can also be used for a dual power
supply setup for pedals using opamps using the LED solder tab for you
+9V.
Max Power Supply Current: 20maMax Input Voltage: 12V
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Wiring Diagram