Category: Main page » Guard and Security

Low Voltage Alarm

Source: http://www.aaroncake.net/

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

R1, R3

2

1K 1/4W Resistor

R2

1

5K Pot

U1

1

LM339 Voltage comparator IC

D1

1

1N5233B Zener Diode

D2

1

LED

BZ1

1

Piezo Buzzer

MISC

1

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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