# Voltage Inverter electronic circuit diagram

This simple circuit is a good solution to the powering a dual supply op amp from a single battery problem. The circuit simply takes a positive voltage and inverts it. It uses only one 555 timer and a few other passive components, so it doesn't add much in the way of size and cost to a project.

Parts

R1
24K 1/4 Watt Resistor

R2
56K 1/4 Watt Resistor

C1
3300pF 25V Ceramic Capacitor

C2
47uF 25V Electrolytic Capacitor

C3
10uF 25V Electrolytic Capacitor

D1, D2
1N4148 Silicon Diode

U1
555 Timer

MISC
Wire, Board

Notes

1. V can be anywhere from 4 to 16V. -V is one volt less than V . So for -12V output, use 13V input. The maximum current output of the circuit is about 280mA, more than enough for a few op amps.

2. For better regulation, a 79LOxx series regulator can be used.

3. A zener diode may also be used to regualte the output voltage.

Source: Electronics Lab

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http://www.free-circuits.com/circuits/power-supplies/174/voltage-inverter

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