Voltage Inverter

Home > Circuits > Power Supply > Voltage Inverter
Author Views Views Today Rank Comments
341,726 7 51
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.
  4. Thanks to audioguru for correcting some errors in the original schematic. Read about it in this forum topic.

Related Circuits

6V to 12V Converter, Portable CD Player Adapter For Car, Car Battery Charger, Automatic 12V Lead Acid Battery Charger, Solid State Tesla Coil/High Voltage Generator, 12VDC To 120VAC Inverter, LASER Power Supply, Power Supply, High Current Power Supply, Dual Polarity Power Supply, High Voltage High Current Power Supply, Transformerless Power Supply, Fixed Voltage Power Supply, Voltage Inverter, Voltage Inverter II, Automatic Load Sensing Power Switch, 12V To 24V DC-DC Converter, Solid State Tesla Coil


Add A Comment

Colin Mitchell
Voltage Inverter
Saturday, September 11, 2010 9:16:51 PM
The output current of this circuit is limited to less than 90mA as this is the maximum current capability of a 1N4148 signal diode.
Voltage Inverter
Thursday, June 03, 2010 9:43:05 AM
I have just made this circuit 12V in i was only seeing a max of -6V out. output oscillating from -3v to -6v, never stable. The circuit was powered for no more than five minutes and exsessive heat was drawn,left any longer i think the 555 would blown. i would not recomend this circuit, but by all means test it yourself.
Ali Bali
555 Voltage Inverter
Sunday, February 21, 2010 7:08:30 AM
The circuit operates as a free running AC Square Wave oscillator. Power is connected across pin's 4 +ve & 1 -ve. The output is then rectified i.e. converted to DC via D1 & D2 then smoothed via C3. For power line noise rejection, add a filter cap across the supply say 1000uf and a 0.1uf. This is a good common circuit for producing a -ve ref voltage from a +ve supply.
Voltage Inverter
Tuesday, January 19, 2010 10:11:48 AM
Eh guys can i know the o/p waveform of this circuit....
Voltage Inverter
Sunday, September 20, 2009 12:42:10 PM
Hey, I made this circuit because i need dual power supply for my op amp project. It works BUT the power supply line (+12 V line) now has noise inteference. can anyone give a hint why it happens?
Voltage Inverter
Monday, June 01, 2009 6:31:07 PM
Some of you who think that this is an inverter that steps up voltage (12v to 120v) should think twice. This is a VOLTAGE or "POLARITY" inverter, which means this circuit switches polarity!
Voltage Inverter
Thursday, March 26, 2009 12:37:20 AM
Ummmm, power input to the circuit is "V+". Vahid, 13V at 8 amps?!?!?! Damn. If you need about 1 amp, use an LM317. Excellant job on the documentation of the inverter, simple and to the point. Thank you!!!!!!
Voltage Inverter
Sunday, February 15, 2009 6:53:45 AM
Hi can you help me please. i have 30volt DC and i vant to convert it to 13.5 (8A). i need any circuit design that is helpful.
Voltage Inverter
Thursday, September 18, 2008 3:14:56 AM
where is the connection to power the circuit, sorry can't find it how will it operate without a supply? thanx
Liston of University of Cebu Computer Engineering Dept.(Philippines)
Voltage Inverter(explain)
Monday, August 04, 2008 4:41:28 AM
IC 555 there is only used for oscillation, to have an AC current and the output is connected to transformer to have a higher voltage.
The last 10 comments are currently shown. Show All Comments. Add A Comment

Back To Circuits Page | Mail Me | Search