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Sunday, August 22, 2010


Things Need to prepare this:
  • Diode
  • Zener Diode
  • Transistor
  • Resistor & capacitor
  • Peizo buzzer
Most of the power-supply failure indicator circuits need a separate
power-supply for themselves. But the alarm circuit presented
here needs no additional supply source. It employs an electrolytic capacitor to store
adequate charge, to feed power to the alarm circuit which sounds an alarm for
a reasonable duration when the mains supply fails.
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