Voltage InverterII
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Voltage InverterII

Source: http://www.aaroncake.net/
This simple and inexpensive circuit 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.

Schematic

This is the schematic of the Voltage Inverter

Parts


Part

Total Qty.

Description

Substitutions

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

Notes

1. U1 dissipates around 1W and will therefore require a heatsink.

2. 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).


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