Voltage Inverter II
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
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).
Title: Voltage Inverter II
electronic circuit
Source: www.aaroncake.net
Published on: 2005-02-03
Reads: 1381
Print version: 
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