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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.

Schematic

Parts

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.

Title: Voltage Inverter
Source: www.aaroncake.net
Published on: 2005-02-03
Reads: 1139
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