Schematics > Power > Negative Supply from single positive Supply
Negative Supply from single positive Supply
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.
Title: Negative Supply from single positive Supply
Source: www.electronic-circuits-diagrams.com
Published on: 2005-02-01
Reads: 249
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