Feb 19, 2013


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.

This is the schematic of the Voltage Inverter


Total Qty.
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


  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.

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