Dual Voltage Inverter Schematic Circuits

This voltage inverter schematic can produce a dual (positive and negative) voltage from a single supply input. It is therefore extremely useful for powering opamp and other circuits that require a dual voltage from a single battery.

The circuit will operate at an input voltage from around 5V to 20V and produce a output from +-2.5V to +-10V.

R1    1    1M Linear Pot   
C1,C2    2    15uf 25V Electrolytic Capacitor   

U1    1    LM380 Audio Amp Chip   
MISC    1    Heatsink For U1, Binding Posts (For Input/Output), Wire, Board

Circuit note:
U1 dissipates around 1W and will therefore require a heatsink. R1 is used to equalize the outputs. The first time you use the circuit, it should be set to mid range and then adjusted with the aid of a voltmeter.

Measure each output while adjusting. The circuit is calibrated when both outputs read the same voltage (either positive or negative).