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Voltage Inverter

2014-12-09 15:02  
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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

This is the schematic of the Voltage Inverter

 

Parts

Part
Total Qty.
Description
Substitutions
R1124K 1/4 Watt Resistor 
R2156K 1/4 Watt Resistor 
C113300pF 25V Ceramic Capacitor 
C2147uF 25V Electrolytic Capacitor 
C3110uF 25V Electrolytic Capacitor 
C41100uF 25V Electrolytic Capacitor 
D1, D221N4148 Silicon Diode 
U11555 Timer 
MISC1Wire, Board 
 

 

Notes

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.For better regulation, a 79LOxxseries regulator can be used.A zener diode may also be used to regualte the output voltage.Thanks to audioguru for correcting some errors in the original schematic. Read about it in this forum topic.
 

 


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