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Supply from single positive Supply -Naveen P N Click here for the circuit diagram
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.
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.
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