What is the differance between negative dc voltage and
positive dc voltage because some circuit uses -24,-5,-12,-
15,volt dc supply
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Answer Posted / sarav3387
DC voltage has either -ve OR +ve polarity. in case,
you connect +ve polarity to ground and -ve polarity to
source, at that time it produces negative DC voltage.
A negative DC supply usually is used along with an
positive supply in audio electronics in order to produce an
AC output (both positive and negative voltage excursions
with respect to the zero volt level) which represents the AC
nature of the typical audio input signal. The only other use
for a negative supply voltage that I can think of is mostly
a thing of the past but old fashioned ram chips required a
+5, +12, and -12v supplies.
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