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Low Voltage Alarm

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  • Nicolae Sfetcu
    Low Voltage Alarm ... This low voltage circuit can be used to monitor batteries and other volatile sources of current for problems. The circuit sounds an alarm
    Message 1 of 1 , Jul 1, 2002

      Low Voltage Alarm


      This low voltage circuit can be used to monitor batteries and other volatile sources of current for problems. The circuit sounds an alarm and lights an LED, but can be interfaced to any number of other circuits for many different uses.

      Schematic


      Schematic for Low Voltage Alarm

      Parts:


      Part
      Total Qty.
      Description
      Substitutions
      R1, R321K 1/4W Resistor
      R215K Pot
      U11LM339 Op Amp IC
      D111N5233B Zener Diode
      D21LED
      BZ11Piezo Buzzer
      MISC1Board, wire, socket for IC

      Notes:

      1. The circuit will operate from 9V to 12V.

      2. Adjust R2 until the alarm goes off at the correct voltage.

      http://www.aaroncake.net/circuits/index.asp

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