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Low Voltage Alarm

2013-08-27 Posted by:elecircuit Source:Internet Visits: Comment () Size:L M S

Summary:Low Voltage Alarm Circuit Description 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

Low Voltage Alarm

Circuit Description

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.

Circuit diagram

Low Voltage Alarm-Circuit diagram

Parts:

  • R1, R3 1K 1/4W Resistor
  • R2 5K Pot
  • U1 LM339 Voltage comparator IC
  • D1 1N5233B Zener Diode
  • D2 LED
  • BZ1 Piezo Buzzer
  • MISC Board, 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.
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Tags:tools meter
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