•  
  •  

Negative Supply from single positive Supply

Naveen P N

Opamps are very useful. But one of their major drawbacks is the requirement of a dual supply. This seriously limits their applications in fields where a dual supply is not affordable or not practicable.
This circuit solves the problem to a certain extent. It provides a negative voltage from a single positive supply. This negative voltage together with the positive supply can be used to power the opamps and other circuits requiring a dual supply.
The circuits operation can be explained as follows:
The 555 IC is operating as an astable multivibrator with a frequency of about 1kHz. A square wave is obtained at the pin 3 of the IC . When the output is positive, the 22uF capacitor charges through the diode D1. When the output at pin 3 is ground, the 22uF discharges through the diode D2 and charges the 100uF capacitor is charged. The output is taken across the 100uF capacitor as shown in the figure.

A disadvantage of this circuit is its poor voltage regulation and current limit. The max. current that can be drawn from this circuit is about 40mA. If you draw more current, the regulation will be lost.
Also the output negative voltage will be a little less than the positive supply due to the diode drops. For example if the voltage is +9V then the output voltage will be about 7.5 V.

If there are any problems please contact webmaster@electronic-circuits-diagrams.com

Please share & like

IC693BEM321 GE FANUC New in box #djh
$820.5 IC693BEM321 GE FANUC  New in box #djh picture
A06B-6096-H303 FANUC Original Brand Drive NEW IN BOX *L
$2749.0 A06B-6096-H303 FANUC Original Brand Drive NEW IN BOX *L picture
Maxpro Technologies, Inc. Maximator DLA 15-NN-M    Air Driven Air Amplifier
$500.0 Maxpro Technologies, Inc. Maximator DLA 15-NN-M    Air Driven Air Amplifier picture
1PC NEW Panasonic / SUNX Fiber Amplifier FX-502 #019
$94.92 1PC NEW Panasonic / SUNX Fiber Amplifier FX-502 #019 picture
1PC New Keyence Fiber Optic Amplifier FS-N13P FS-N13P #019
$118.09 1PC New Keyence Fiber Optic Amplifier FS-N13P FS-N13P #019 picture