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How to build Low Voltage Alarm

2016-02-18 11:36  
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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


R1, R3 1K 1/4W ResistorR2 5K PotU1 LM339 Voltage comparator ICD1 1N5233B Zener DiodeD2 LEDBZ1 Piezo BuzzerMISC Board, wire, socket for IC


The circuit will operate from 9V to 12V.Adjust R2 until the alarm goes off at the correct voltage.

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